Harley Davidson 2018 softail models. Service manual — page 38
Figure 2. Turn Signal Circuit
Special Tools
Description
Part Number
Qty.
TEST CONNECTOR KIT
HD-41404
1
BREAKOUT BOX
HD-50390-1
1
BCM CABLE
HD-50390-2
1
BCM OVERLAY
HD-50390-2-P
1
Table 1. DTC B2141 Diagnostic Faults
POSSIBLE CAUSES
Open in left front turn signal ground circuit
Open in left front turn signal power circuit
Short to voltage in left front turn signal power circuit
Bulb malfunction
1. Left Front Turn Signal Test
1. Turn IGN OFF.
2. Inspect left front turn signal.
3. Is lamp good?
a. Yes. Go to Test 2.
b. No. Lamp is LED. Go to Test 3.
c. No. Bulb does not work. Replace bulb.
2. Left Front Turn Signal Circuit Test
1. Disconnect left front turn signal [31LA-2].
2. Using TEST CONNECTOR KIT (Part Number:HD-41404), connect test light to [31LA-2] terminals 2 and 3.
3. Turn IGN ON.
4. Press left turn signal switch.
5. Does test light flash?
a. Yes. Replace left front turn signal.
b. No. Go to Test 4.
3. Left Front Turn Signal Circuit Test
1. Disconnect left front turn signal [31RA-2].
2. Using TEST CONNECTOR KIT (Part Number:HD-41404), check for voltage [31LA-2] terminals 2 and 3.
3. Turn IGN ON.
4. Press left turn signal switch.
5. Does battery voltage turn on and off?
a. Yes. Replace left front turn signal.
b. No. Go to Test 4.
4. Power Circuit Open Test
1. Turn IGN OFF.
2. Connect BREAKOUT BOX (Part Number:HD-50390-1) and BCM CABLE (Part Number:HD-50390-2) to wire
harness [242B], leaving [242A] disconnected. See How To Use Diagnostic Tools.
3. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
4. Using TEST CONNECTOR KIT (Part Number:HD-41404), test resistance between BOB terminal J4 and
[31LA-2] terminal 2.
5. Is resistance less than 0.5 ohm?
a. Yes. Go to Test 5.
b. No. Repair open in (BE/PK) wire.
5. Ground Circuit Open Test
1. Using TEST CONNECTOR KIT (Part Number:HD-41404), test resistance between [31LA-2] terminal 3 and
ground.
2. Is resistance less than 0.5 ohms?
a. Yes. Go to Test 6.
b. No. Repair open in (BK) wire.
6. Short To Voltage Test
1. Connect BREAKOUT BOX (Part Number:HD-50390-1) and BCM CABLE (Part Number:HD-50390-2) to wire
harness [242B], leaving [242A] disconnected.
2. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
3. Turn IGN ON.
4. Using TEST CONNECTOR KIT (Part Number:HD-41404), test voltage between BOB terminal J4 and ground.
5. Is voltage present?
a. Yes. Repair short to voltage in BE/PK) wire.
b. No. Replace BCM.
Special Tools
Description
Part Number
Qty.
TEST CONNECTOR KIT
HD-41404
1
BREAKOUT BOX
HD-50390-1
1
BCM CABLE
HD-50390-2
1
BCM OVERLAY
HD-50390-2-P
1
Table 1. DTC B2143, B2144 Diagnostic Faults
POSSIBLE CAUSES
Left front turn signal bulb current exceeds 3.0A
Accessory lighting overloading circuit
Short to ground in left front turn signal power circuit
1. Left Front Turn Signal Test
1. Turn IGN OFF.
2. Inspect left front turn signal.
3. Is bulb good or LED?
a. Yes. Go to Test 2.
b. No. Replace bulb.
2. Power Circuit Short to Ground Test
1. Connect BREAKOUT BOX (Part Number:HD-50390-1) and BCM CABLE (Part Number:HD-50390-2) to wire
harness [242B], leaving [242A] disconnected. See How To Use Diagnostic Tools.
2. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
3. Using TEST CONNECTOR KIT (Part Number:HD-41404), with [31LB-2] disconnected, test continuity between
BOB terminal J4 and ground.
4. Is continuity present?
a. Yes. Repair short to ground in left front turn signal power circuit (BE/PK).
b. No. Go to Test 3.
3. DTC Test
1. Connect [242].
2. Clear DTC.
3. Turn IGN ON.
4. Turn on left turn signal.
5. With [31LB-2] disconnected, check DTCs.
6. Did DTC B2143 or B2144 reset?
a. Yes. Replace BCM.
b. No. Replace turn signal assembly.
Special Tools
Description
Part Number
Qty.
TEST CONNECTOR KIT
HD-41404
1
BREAKOUT BOX
HD-50390-1
1
BCM CABLE
HD-50390-2
1
BCM OVERLAY
HD-50390-2-P
1
Table 1. DTC B2146 Diagnostic Faults
POSSIBLE CAUSES
Open in right front turn signal ground circuit
Open in right front turn signal power circuit
Short to voltage in right front turn signal power circuit
Bulb malfunction
1. Right Front Turn Signal Test
1. Turn IGN OFF.
2. Inspect right front turn signal.
3. Is lamp good?
a. Yes. Go to Test 2.
b. No. Lamp is LED. Go to Test 3.
c. No. Bulb does not work. Replace bulb.
2. Right Front Turn Signal Circuit Test
1. Disconnect right front turn signal [31RA-2].
2. Using TEST CONNECTOR KIT (Part Number:HD-41404), connect test light to [31RA-2] terminals 2 and 3.
3. Turn IGN ON.
4. Press right turn signal switch.
5. Does test light flash?
a. Yes. Replace right front turn signal.
b. No. Go to Test 4.
3. Right Front Turn Signal Circuit Test
1. Disconnect right front turn signal [31RA-2].
2. Using TEST CONNECTOR KIT (Part Number:HD-41404), check for voltage [31RA-2] terminals 2 and 3.
3. Turn IGN ON.
4. Press right turn signal switch.
5. Does battery voltage turn on and off?
a. Yes. Replace right front turn signal.
b. No. Go to Test 4.
4. Power Circuit Open Test
1. Turn IGN OFF.
2. Connect BREAKOUT BOX (Part Number:HD-50390-1) and BCM CABLE (Part Number:HD-50390-2) to wire
harness [242B], leaving [242A] disconnected. See How To Use Diagnostic Tools.
3. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
4. Using TEST CONNECTOR KIT (Part Number:HD-41404), test resistance between BOB terminal J2 and
[31RA-2] terminal 2.
5. Is resistance less than 0.5 ohm?
a. Yes. Go to Test 5.
b. No. Repair open in (BE/O) wire.
5. Ground Circuit Open Test
1. Using TEST CONNECTOR KIT (Part Number:HD-41404), test resistance between [31RA-2] terminal 3 and
ground.
2. Is resistance less than 0.5 ohm?
a. Yes. Go to Test 6.
b. No. Repair open in (BK) wire.
6. Short To Voltage Test
1. Connect BREAKOUT BOX (Part Number:HD-50390-1) and BCM CABLE (Part Number:HD-50390-2) to wire
harness [242B], leaving [242A] disconnected.
2. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
3. Turn IGN ON.
4. Using TEST CONNECTOR KIT (Part Number:HD-41404), test voltage between BOB terminal J2 and ground.
5. Is voltage present?
a. Yes. Repair short to voltage in BE/O) wire.
b. No. Replace BCM.
Special Tools
Description
Part Number
Qty.
TEST CONNECTOR KIT
HD-41404
1
BREAKOUT BOX
HD-50390-1
1
BCM CABLE
HD-50390-2
1
BCM OVERLAY
HD-50390-2-P
1
Table 1. DTC B2148, B2149 Diagnostic Faults
POSSIBLE CAUSES
Right front turn signal bulb current exceeds 3.0A
Accessory lighting overloading circuit
Short to ground in right front turn signal power circuit
1. Right Front Turn Signal Test
1. Turn IGN OFF.
2. Inspect right front turn signal.
3. Is bulb good or LED?
a. Yes. Go to Test 2.
b. No. Bulb does not work. Replace bulb.
2. Power Circuit Short to Ground Test
1. Connect BREAKOUT BOX (Part Number:HD-50390-1) and BCM CABLE (Part Number:HD-50390-2) to wire
harness [242B], leaving [242A] disconnected. See How To Use Diagnostic Tools.
2. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
3. Using TEST CONNECTOR KIT (Part Number:HD-41404), with [31RB-2] disconnected, test continuity
between BOB terminal J2 and ground.
4. Is continuity present?
a. Yes. Repair short to ground in right front turn signal power circuit (BE/O) wire.
b. No. Go to Test 3.
3. DTC Test
1. Connect [242].
2. Clear DTC.
3. Turn IGN ON.
4. Turn on right turn signal.
5. With [31RB-2] disconnected, check DTCs.
6. Did DTC B2148 or B2149 reset?
a. Yes. Replace BCM.
b. No. Replace turn signal assembly.
See Figure 1. The rear turn signals are controlled by the BCM. The BCM supplies power to the rear turn signals and
controls the flash rate of the turn signals through the power circuit.
Table 1. Code Description
DTC
DESCRIPTION
B2151
Left rear turn signal output open
B2153
Left rear turn signal output shorted low
B2154
Left rear turn signal output overloaded
B2156
Right rear turn signal output open
B2158
Right rear turn signal output shorted low
B2159
Right rear turn signal output overloaded
Conditions for Setting
After clearing the DTCs, operate the inoperative turn signal to verify if the DTC has returned.
DTC B2151 or B2156 will set if the corresponding rear turn signal circuit draws less than 120 milliamps.
DTC B2154 or B2159 will set if the corresponding rear turn signal circuit draws more than 3 Amps.
1
Purge solenoid [95]
2
GND 2A
3
GND 1
4
GND 2
5
Backbone harness interconnect [327]
6
Engine harness interconnect [328]
7
Engine harness [145]
8
Security antenna [209]
9
Left rear lighting [19]
10
Right rear lighting [18]
11
Tail lamp [40]
Figure 1. Under Seat
Connector Information
For additional information about the connectors in the following diagram(s) and diagnostic procedure(s), see General.
Figure 2. Turn Signal Circuit
Special Tools
Description
Part Number
Qty.
TEST CONNECTOR KIT
HD-41404
1
BREAKOUT BOX
HD-50390-1
1
BCM CABLE
HD-50390-2
1
BCM OVERLAY
HD-50390-2-P
1
Table 1. DTC B2151 Diagnostic Faults
POSSIBLE CAUSES
Open in left rear turn signal ground circuit
Open in left rear turn signal power circuit
Short to voltage in left rear turn signal power circuit
Bulb malfunction
1. Left Rear Turn Signal Test
1. With IGN ON, inspect left rear turn signal.
2. Is the turn signal always on?
a. Yes. Go to Test 2.
b. No. Go to Test 3.
2. Left Rear Turn Signal Short To Voltage Test
1. Disconnect left rear turn signal [19] at main harness.
2. Using TEST CONNECTOR KIT (Part Number:HD-41404), connect test light to [19A] terminals 2 and 4.
3. Turn IGN ON.
4. Does test light illuminate?
a. Yes. Repair short to voltage in (BE/V) wire.
b. No. Repair short to voltage in rear lighting harness.
3. Left Rear Bulb Test
1. Turn IGN OFF.
2. Inspect left rear turn signal.
3. Is bulb good or LED?
a. Yes. Go to Test 4.
b. No. Replace bulb.
4. Left Rear Turn Signal Circuit Test
1. Disconnect left rear turn signal [19] at main harness.
2. Using TEST CONNECTOR KIT (Part Number:HD-41404), connect test light to [19A] terminals 2 and 4.
3. Turn IGN ON.
4. Press left turn signal switch.
5. Does test light flash?
a. Yes. Except FLDE, FLHC/S. Replace left rear turn signal.
b. Yes. FLDE. Go to Test 7.
c. Yes. FLHC/S. Go to Test 10.
d. No. Go to Test 5.
5. Left Rear Turn Signal Ground Circuit Test
1. Connect test light to [19A] terminal 2 and ground.
2. Press left turn signal switch.
3. Does test light flash?
a. Yes. Repair open in (BK) wire.
b. No. Go to Test 6.
6. Power Circuit Open Test
1. Turn IGN OFF.
2. Connect BREAKOUT BOX (Part Number:HD-50390-1) and BCM CABLE (Part Number:HD-50390-2) to wire
harness [242B], leaving [242A] disconnected.
3. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
4. Using TEST CONNECTOR KIT (Part Number:HD-41404), test resistance between BOB terminal K4 and [19A]
terminal 2.
5. Is resistance less than 0.5 ohms?
a. Yes. Replace BCM.
b. No. Repair open in (BE/V) wire.
7. Turn Signal Test
1. Connect [19].
2. Disconnect left rear turn signal [19-2].
3. Using TEST CONNECTOR KIT (Part Number:HD-41404), connect test light to [19B-2] terminals 2 and 4.
4. Turn IGN ON.
5. Press left turn signal switch.
6. Does test light flash?
a. Yes.Replace left rear turn signal.
b. No. Go to Test 8.
8. Ground Circuit Open Test
1. Connect test light to [19B-2] terminals 2 and ground.
2. Press left turn signal switch.
3. Does test light flash?
a. Yes. Repair open in left rear turn signal ground circuit.
b. No. Go to Test 9.
9. Power Circuit Open Test
1. Turn IGN OFF.
2. Connect BREAKOUT BOX (Part Number:HD-50390-1) and BCM CABLE (Part Number:HD-50390-2) to wire
harness [242B], leaving [242A] disconnected.
3. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
4. Using TEST CONNECTOR KIT (Part Number:HD-41404), test resistance between BOB terminal K4 and [19B-
2] terminal 2.
5. Is resistance less than 0.5 ohms?
a. Yes. Replace BCM.
b. No. Repair open in (BE/V) wire.
10. Left Rear Turn Signal Test
1. Connect [19].
2. Disconnect left rear turn signal [19-2].
3. Using TEST CONNECTOR KIT (Part Number:HD-41404), connect test light to [19A-2] terminals 1 and 2.
4. Turn IGN ON.
5. Press left turn signal switch.
6. Does test light flash?
a. Yes. Replace left rear turn signal.
b. No. Go to Test 11.
11. Turn Signal Ground Circuit Open Test
1. Connect test light to [19A-2] terminals 1 and ground.
2. Press left turn signal switch.
3. Does test light flash?
a. Yes. Repair open in left rear turn signal ground circuit.
b. No. Go to Test 12.
12. Turn Signal Power Circuit Open Test
1. Turn IGN OFF.
2. Connect BREAKOUT BOX (Part Number:HD-50390-1) and BCM CABLE (Part Number:HD-50390-2) to wire
harness [242B], leaving [242A] disconnected.
3. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
4. Using TEST CONNECTOR KIT (Part Number:HD-41404), test resistance between BOB terminal K4 and [19A-
2] terminal 1.
5. Is resistance less than 0.5 ohms?
a. Yes. Replace BCM.
b. No. Go to Test 13.
13. Circuit Board Test
1. Disconnect circuit board [94].
2. Test resistance between BOB terminal K4 and [94B] terminal 5.
3. Is resistance less than 0.5 ohms?
a. Yes. Replace circuit board.
b. No. Repair open in (BE/V) wire.
Special Tools
Description
Part Number
Qty.
TEST CONNECTOR KIT
HD-41404
1
BREAKOUT BOX
HD-50390-1
1
BCM CABLE
HD-50390-2
1
BCM OVERLAY
HD-50390-2-P
1
Table 1. DTC B2153, B2154 Diagnostic Faults
POSSIBLE CAUSES
Left rear turn signal bulb current too high
Accessory lighting overloading circuit
Short to ground in left rear turn signal power circuit
1. DTC Test
1. Disconnect left rear turn signal [19] at main harness.
2. Check DTCs.
3. Did DTC change to historic code?
a. Yes. Except FLDE, FLHC/S. Replace left rear turn signal.
b. Yes. FLDE. Go to Test 3.
c. Yes. FLHC/S. Go to Test 4.
d. No. Go to Test 2.
2. Power Circuit Short to Ground Test
1. Turn IGN OFF.
2. Connect BREAKOUT BOX (Part Number:HD-50390-1) and BCM CABLE (Part Number:HD-50390-2) to wire
harness [242B], leaving [242A] disconnected. See How To Use Diagnostic Tools.
3. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
4. Using TEST CONNECTOR KIT (Part Number:HD-41404), test continuity between BOB terminal K4 and
ground.
5. Is continuity present?
a. Yes. Repair short to ground in (BE/V) wire.
b. No. Replace BCM.
3. Turn Signal Component Test
1. Disconnect left rear turn signal.
2. Using TEST CONNECTOR KIT (Part Number:HD-41404), test continuity between [19B] terminal 2 and
ground.
3. Is continuity present?
a. Yes. Repair short to ground in left rear turn signal power circuit.
b. No. Replace left rear turn signal assembly.
4. Left Rear Turn Signal Component Test
1. Disconnect left rear turn signal.
2. Using TEST CONNECTOR KIT (Part Number:HD-41404), test continuity between [19A] terminal 1 and
ground.
3. Is continuity present?
a. Yes. Repair short to ground in left rear turn signal power circuit.
b. No. Replace left rear turn signal assembly.
Special Tools
Description
Part Number
Qty.
TEST CONNECTOR KIT
HD-41404
1
BREAKOUT BOX
HD-50390-1
1
BCM CABLE
HD-50390-2
1
BCM OVERLAY
HD-50390-2-P
1
Table 1. DTC B2156 Diagnostic Faults
POSSIBLE CAUSES
Open in right rear turn signal ground circuit
Open in right rear turn signal power circuit
Short to voltage in right rear turn signal power circuit
Bulb malfunction
1. Right Rear Turn Signal Test
1. With IGN ON, inspect right rear turn signal.
2. Is the turn signal always on?
a. Yes. Go to Test 2.
b. No. Go to Test 3.
2. Right Rear Turn Signal Short To Voltage Test
1. Disconnect right rear turn signal [18] at main harness.
2. Using TEST CONNECTOR KIT (Part Number:HD-41404), connect test light to [18A] terminals 2 and 4.
3. Turn IGN ON.
4. Does test light illuminate?
a. Yes. Repair short to voltage in (BE/BN) wire.
b. No. Repair short to voltage in rear lighting harness.
3. Right Rear Bulb Test
1. Turn IGN OFF.
2. Inspect right rear turn signal.
3. Is bulb good or LED?
a. Yes. Go to Test 4.
b. No. Replace bulb.
4. Right Rear Turn Signal Circuit Test
1. Disconnect right rear turn signal [18] at main harness.
2. Using TEST CONNECTOR KIT (Part Number:HD-41404), connect test light to [18A] terminals 2 and 4.
3. Turn IGN ON.
4. Press right turn signal switch.
5. Does test light flash?
a. Yes. Except FLDE, FLHC/S. Replace right rear turn signal.
b. Yes. FLDE. Go to Test 7.
c. Yes. FLHC/S. Go to Test 10.
d. No. Go to Test 5.
5. Right Rear Turn Signal Ground Circuit Test
1. Connect test light to [18A] terminal 2 and ground.
2. Press right turn signal switch.
3. Does test light flash?
a. Yes. Repair open in (BK) wire.
b. No. Go to Test 6.
6. Power Circuit Open Test
1. Turn IGN OFF.
2. Connect BREAKOUT BOX (Part Number:HD-50390-1) and BCM CABLE (Part Number:HD-50390-2) to wire
harness [242B], leaving [242A] disconnected.
3. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
4. Using TEST CONNECTOR KIT (Part Number:HD-41404), test resistance between BOB terminal K2 and [18A]
terminal 2.
5. Is resistance less than 0.5 ohms?
a. Yes. Replace BCM.
b. No. Repair open in (BE/BN) wire.
7. Turn Signal Test
1. Connect [19].
2. Disconnect right rear turn signal [18-2].
3. Using TEST CONNECTOR KIT (Part Number:HD-41404), connect test light to [18B-2] terminals 2 and 4.
4. Turn IGN ON.
5. Press right turn signal switch.
6. Does test light flash?
a. Yes. Replace right rear turn signal.
b. No. Go to Test 8.
8. Ground Circuit Open Test
1. Connect test light to [18B-2] terminals 2 and ground.
2. Press right turn signal switch.
3. Does test light flash?
a. Yes. Repair open in right rear turn signal ground circuit.
b. No. Go to Test 9.
9. Power Circuit Open Test
1. Turn IGN OFF.
2. Connect BREAKOUT BOX (Part Number:HD-50390-1) and BCM CABLE (Part Number:HD-50390-2) to wire
harness [242B], leaving [242A] disconnected.
3. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
4. Using TEST CONNECTOR KIT (Part Number:HD-41404), test resistance between BOB terminal K2 and [18B-
2] terminal 2.
5. Is resistance less than 0.5 ohms?
a. Yes. Replace BCM.
b. No. Repair open in (BE/BN) wire.
10. Right Rear Turn Signal Test
1. Connect [18].
2. Disconnect right rear turn signal [18-2].
3. Using TEST CONNECTOR KIT (Part Number:HD-41404), connect test light to [18A-2] terminals 1 and 2
4. Turn IGN ON.
5. Press right turn signal switch.
6. Does test light flash?
a. Yes. Replace right rear turn signal.
b. No. Go to Test 11.
11. Turn Signal Ground Circuit Open Test
1. Connect test light to [18A-2] terminals 1 and ground.
2. Press right turn signal switch.
3. Does test light flash?
a. Yes. Repair open in right rear turn signal ground circuit.
b. No. Go to Test 12.
12. Turn Signal Power Circuit Open Test
1. Turn IGN OFF.
2. Connect BREAKOUT BOX (Part Number:HD-50390-1) and BCM CABLE (Part Number:HD-50390-2) to wire
harness [242B], leaving [242A] disconnected.
3. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
4. Using TEST CONNECTOR KIT (Part Number:HD-41404), test resistance between BOB terminal K2 and [18A-
2] terminal 1.
5. Is resistance less than 0.5 ohms?
a. Yes. Replace BCM.
b. No. Go to Test 13.
13. Circuit Board Test
1. Disconnect circuit board [94].
2. Test resistance between BOB terminal K2 and [94B] terminal 2.
3. Is resistance less than 0.5 ohms?
a. Yes. Replace circuit board.
b. No. Repair open in (BE/BN) wire.
Special Tools
Description
Part Number
Qty.
TEST CONNECTOR KIT
HD-41404
1
BREAKOUT BOX
HD-50390-1
1
BCM CABLE
HD-50390-2
1
BCM OVERLAY
HD-50390-2-P
1
Table 1. DTC B2158, B2159 Diagnostic Faults
POSSIBLE CAUSES
Right rear turn signal bulb current too high
Accessory lighting overloading circuit
Short to ground in right rear turn signal power circuit
1. DTC Test
1. Disconnect right rear turn signal [18] at main harness.
2. Check DTCs.
3. Did DTC change to historic code?
a. Yes. Except FLDE, FLHC/S. Replace right rear turn signal.
b. Yes. FLDE. Go to Test 3.
c. Yes. FLHC/S. Go to Test 4.
d. No. Go to Test 2.
2. Power Circuit Short to Ground Test
1. Turn IGN OFF.
2. Connect BREAKOUT BOX (Part Number:HD-50390-1) and BCM CABLE (Part Number:HD-50390-2) to wire
harness [242B], leaving [242A] disconnected. See How To Use Diagnostic Tools.
3. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
4. Using TEST CONNECTOR KIT (Part Number:HD-41404), test continuity between BOB terminal K2 and
ground.
5. Is continuity present?
a. Yes. Repair short to ground in (BE/BN) wire.
b. No. Replace BCM.
3. Turn Signal Component Test
1. Disconnect right rear turn signal.
2. Using TEST CONNECTOR KIT (Part Number:HD-41404), test continuity between [18B] terminal 2 and
ground.
3. Is continuity present?
a. Yes. Repair short to ground in right rear turn signal power circuit.
b. No. Replace right rear turn signal assembly.
4. Right Rear Turn Signal Component Test
1. Disconnect right rear turn signal.
2. Using TEST CONNECTOR KIT (Part Number:HD-41404), test continuity between [18A] terminal 1 and
ground.
3. Is continuity present?
a. Yes. Repair short to ground in right rear turn signal power circuit.
b. No. Replace right rear turn signal assembly.
The headlamp switch activates either the high beam or the low beam headlamps. When the ignition is turned ON, the BCM
defaults to the low beam position. Pressing the upper part of the switch toggles to the high beam headlamp and the lower
part of the switch toggles to the low beam headlamp.
In the low position, the BCM supplies power to illuminate the low beam headlamp.
Push the low position again, the BCM supplies power to the high beam headlamp to provide a flash to pass feature.
In the high position, BCM supplies power to the high beam headlamp and sends a message to the speedometer over
the CAN bus to illuminate the high beam indicator.
1
Right AUX/fog lamp [73R-2]
2
Headlamp [38-2]
3
Left AUX/fog lamp [73L-2]
4
Front left turn [31L-2]
5
Left AUX/fog lamp [73L]
6
Horn [122-1]
7
Horn [122-2]
8
Right AUX/fog lamp [73R]
9
Front right turn [31R-2]
Figure 1. Headlamp: FLSTC, FLSTN
1
Headlamp security siren [38]
2
Console [20]
3
TGS [204]
4
Right front lighting [31R]
5
Front WSS [167]
6
Left front lighting [31L]
7
USB caddy interconnect [329]
8
LHCM [24]
9
RHCM [22-1]
10
RHCM [22-2]
Figure 2. USB Caddy
Table 1. Code Description
DTC
DESCRIPTION
B2106
L4 output open
B2107
L4 output shorted high
B2108
L4 output shorted low
B2109
L4 output overloaded
B2131
High beam output open
B2132
High beam output shorted high
B2133
High beam output shorted low
B2134
High beam output overloaded
B2136
Low beam output open
B2137
Low beam output shorted high
B2138
Low beam output shorted low
B2139
Low beam output overloaded
Conditions for Setting
The headlamp DTCs may require either the high or low beam headlamp be requested on in order to set the DTC.
Toggle back and forth between the high and low beam headlamp positions to check DTCs on both circuits.
DTC B2106 will set if the running lights circuit is below 120 milliamps. This will happen if all lights on the circuit are
open.
DTC B2109 will set if the switched power output circuit is above 10 Amps.
DTC B2131 or B2136 will set if the corresponding headlamp circuit draws less than 1.2 Amps.
DTC B2134 or B2139 will set if the corresponding headlamp circuit draws more than 12 Amps.
Diagnostic Tips
If the headlamp cannot be switched from one position to the other with no codes it could be an open switch causing
the problem. See Description and Operation.
Turn IGN to ACC. If low beam illuminates, this circuit is shorted to voltage. If the high beam illuminates, this circuit is
shorted to voltage.
Connector Information
For additional information about the connectors in the following diagram(s) and diagnostic procedure(s), see General.
Figure 3. Headlamp and Auxiliary Lamps
Special Tools
Description
Part Number
Qty.
TEST CONNECTOR KIT
HD-41404
1
BCM CABLE
HD-50390-2
1
BCM OVERLAY
HD-50390-2-P
1
Table 1. Auxiliary Lamps Inoperative Diagnostic Faults
POSSIBLE CAUSES
Auxiliary lamp malfunction
LHCM auxiliary switch malfunction
Open in auxiliary power circuit
Open in auxiliary ground circuit
1. Auxiliary Lamps Operation Test
1. Turn IGN ON.
2. Activate aux lamp switch on LHCM.
3. Do auxiliary lamps illuminate?
a. Yes. System operating properly. Intermittent perform wiggle test. See Wiggle Test.
b. No. Auxiliary lamps inoperative. Verify DTC B2259 is not present. Refer to Diagnostics.
c. No. One or both auxiliary lamp is operative. Go to Test 2.
2. Auxiliary Lamp Circuit Test
1. Turn IGN OFF.
2. Disconnect left and right auxiliary lamps [73L] and [73R].
3. Turn IGN ON.
4. Using TEST CONNECTOR KIT (Part Number:HD-41404), test voltage between inoperative circuit at [73B]
terminal 1 or 2 of inoperative aux lamp.
5. Is battery voltage present?
a. Yes. Replace inoperative auxiliary lamp.
b. No. Go to Test 3.
3. Ground Circuit Open Test
1. Turn IGN OFF.
2. Test resistance between [73LB] or [73RB] terminal 1 and ground.
3. Is resistance less than 0.5 ohm?
a. Yes. Go to Test 4.
b. No. Repair open in ground circuit.
4. Power Circuit Open Test
1. Connect BCM CABLE (Part Number:HD-50390-2) between wire harness [242B] and [242A].
2. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
3. Test resistance between BOB terminal L4 and [73B] terminal 2 of both left and right aux lamps.
4. Is resistance less than 0.5 ohms?
a. Yes. Go to Test 5.
b. No. Repair open in power circuit.
5. Verify Aux Switch Function
1. Plug in a good known LHCM.
2. Turn IGN ON.
3. Do aux lamps function?
a. Yes. Replace LHCM.
b. No. Replace BCM.
Special Tools
Description
Part Number
Qty.
TEST CONNECTOR KIT
HD-41404
1
BREAKOUT BOX
HD-50390-1
1
BCM CABLE
HD-50390-2
1
BCM OVERLAY
HD-50390-2-P
1
1.5 MM TERMINAL EXTRACTOR
HD-50424
1
TOOL
Table 1. DTC B2106, B2107 Diagnostic Faults
POSSIBLE CAUSES
Short to power in aux lamp circuit
1. Aux Lamp Circuit Test
1. Turn IGN OFF.
2. Disconnect BCM [242].
3. Using 1.5 MM TERMINAL EXTRACTOR TOOL (Part Number:HD-50424), remove terminal L4 from [242B].
4. Connect BREAKOUT BOX (Part Number:HD-50390-1) and BCM CABLE (Part Number:HD-50390-2)
between wire harness [242B] and [242A]. See How To Use Diagnostic Tools.
5. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
6. Turn IGN ON.
7. Using TEST CONNECTOR KIT (Part Number:HD-41404), test voltage between extracted terminal L4 and
ground.
8. Is voltage present?
a. Yes. Repair short to voltage in the aux lamp circuit.
b. No. Go to Test 2.
2. DTC Test
1. Connect [242].
2. Clear DTC.
3. Turn IGN ON.
4. Check DTCs.
5. Did DTC reset?
a. Yes. Replace BCM.
b. No. Condition not currently present.
Special Tools
Description
Part Number
Qty.
TEST CONNECTOR KIT
HD-41404
1
BCM CABLE
HD-50390-2
1
BCM OVERLAY
HD-50390-2-P
1
Table 1. Auxiliary Lamps Inoperative Diagnostic Faults: Japan
POSSIBLE CAUSES
Auxiliary lamp malfunction
Open in auxiliary power circuit
Open in auxiliary ground circuit
1. Auxiliary Lamps Operation Test
1. Turn IGN ON.
2. Do auxiliary lamps illuminate?
a. Yes. System operating properly. Intermittent perform wiggle test. See Wiggle Test.
b. No. Auxiliary lamps inoperative. Verify DTC code B2259 is not present. Refer to Diagnostics.
c. No. One or both auxiliary lamp is operative. Go to Test 2.
2. Auxiliary Lamp Circuit Test
1. Turn IGN OFF.
2. Disconnect both [73LB] and [73RB] auxiliary lamps.
3. Turn IGN ON.
4. Using TEST CONNECTOR KIT (Part Number:HD-41404), test voltage between inoperative circuit at [73B]
terminal 1 or 2 of inoperative aux lamp.
5. Is battery voltage present?
a. Yes. Replace inoperative auxiliary lamp.
b. No. Go to Test 3.
3. Ground Circuit Open Test
1. Turn IGN OFF.
2. Test resistance between [73LB] and [73RB] terminal 1 and ground.
3. Is resistance less than 0.5 ohm?
a. Yes. Go to Test 4.
b. No. Repair open in ground circuit.
4. Power Circuit Open Test
1. Connect BCM CABLE (Part Number:HD-50390-2) between wire harness [242B] and [242A].
2. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
3. Test resistance between BOB terminal L4 and [73B] terminal 2 of both left or right aux lamps.
4. Is resistance less than 0.5 ohms?
a. Yes. Replace BCM.
b. No. Repair open in power circuit.
Special Tools
Description
Part Number
Qty.
BREAKOUT BOX
HD-50390-1
1
BCM CABLE
HD-50390-2
1
BCM OVERLAY
HD-50390-2-P
1
Table 1. DTC B2108, B2109 Diagnostic Faults
POSSIBLE CAUSES
Short to ground in aux lamp circuit
High current in aux lamp circuit
Accessory lighting overloading circuit
1. Aux Lamp Circuit Short to Ground Test
1. Turn IGN OFF.
2. Disconnect BCM [242].
3. Disconnect aux lamp [73RB] and [73LB].
4. Connect BREAKOUT BOX (Part Number:HD-50390-1) and BCM CABLE (Part Number:HD-50390-2) to wire
harness [242B], leaving [242A] disconnected. See How To Use Diagnostic Tools.
5. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
6. Test continuity between BOB terminal L4 and ground.
7. Is continuity present?
a. Yes. Repair short to ground in (BE/BK) wire.
b. No. Go to Test 2.
2. Excessive Draw Test
1. Cycle IGN ON-OFF-ON.
2. Check DTCs.
3. Is the code current?
a. Yes. Go to Test 3.
b. No. Replace aux lamp that was causing issue.
3. DTC Test
1. Turn IGN OFF.
2. Connect [242].
3. Clear DTC.
4. Turn IGN ON.
5. Check DTCs.
6. Did DTC reset?
a. Yes. Replace BCM.
b. No. Condition not currently present.
Special Tools
Description
Part Number
Qty.
TEST CONNECTOR KIT
HD-41404
1
1.5 MM TERMINAL EXTRACTOR
HD-50424
1
TOOL
Table 1. DTC B2132 Diagnostic Faults
POSSIBLE CAUSES
Short to voltage in headlamp high beam circuit
1. Headlamp Test
1. Turn IGN OFF.
2. Disconnect BCM [242].
3. Using 1.5 MM TERMINAL EXTRACTOR TOOL (Part Number:HD-50424), remove terminal M3 from [242B].
4. Connect [242].
5. Turn IGN ON.
6. Using TEST CONNECTOR KIT (Part Number:HD-41404), test voltage between extracted terminal M3 and
ground.
7. Is voltage present?
a. Yes. Repair short to voltage in (BE/W) wire.
b. No. Go to Test 2.
2. DTC Test
1. Install terminal M3 from [242B].
2. Connect [242].
3. Clear DTCs.
4. Turn IGN ON.
5. Observe headlamp in high and low beam positions.
6. Check DTCs.
7. Did DTC reset?
a. Yes. Replace BCM.
b. No. Condition is intermittent. See Wiggle Test.
Special Tools
Description
Part Number
Qty.
TEST CONNECTOR KIT
HD-41404
1
BREAKOUT BOX
HD-50390-1
1
BCM CABLE
HD-50390-2
1
BCM OVERLAY
HD-50390-2-P
1
Table 1. DTC B2133, B2134 Diagnostic Faults
POSSIBLE CAUSES
Short to ground in high beam headlamp circuit
Accessory lighting overloading circuit
Headlamp malfunction
1. High Beam Headlamp Circuit Test
1. Turn IGN OFF.
2. Disconnect headlamp [38-2].
3. Connect BREAKOUT BOX (Part Number:HD-50390-1) and BCM CABLE (Part Number:HD-50390-2) to wire
harness [242B], leaving [242A] disconnected. See How To Use Diagnostic Tools.
4. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
5. Using TEST CONNECTOR KIT (Part Number:HD-41404), test continuity between BOB terminal M3 and
ground.
6. Is continuity present?
a. Yes. Repair short to ground in (BE/W) wire.
b. No. Go to Test 2.
2. DTC Test
1. Connect [242].
2. Clear DTCs.
3. Turn IGN ON.
4. Check DTCs.
5. Did DTC reset?
a. Yes. Replace BCM.
b. No. Replace headlamp.
Special Tools
Description
Part Number
Qty.
TEST CONNECTOR KIT
HD-41404
1
BREAKOUT BOX
HD-50390-1
1
BCM CABLE
HD-50390-2
1
BCM OVERLAY
HD-50390-2-P
1
Table 1. High Beam Headlamp Inoperative, DTC B2131 Diagnostic Faults
POSSIBLE CAUSES
Open in high beam ground circuit
Open in high beam power circuit
Headlamp malfunction
1. Power Circuit Test
1. Turn IGN OFF.
2. Disconnect headlamp [38-2].
3. Turn IGN ON.
4. Switch headlamp to HI beam.
5. Using TEST CONNECTOR KIT (Part Number:HD-41404), test voltage between [38B-2] terminal HI (BE/W)
and ground.
6. Is battery voltage present?
a. Yes. Go to Test 2.
b. No. Go to Test 3.
2. Ground Circuit Open Test
1. Turn IGN OFF.
2. Test resistance between [38B-2] terminal GND (BK) and ground.
3. Is resistance less than 0.5 ohm?
a. Yes. Replace headlamp.
b. No. Repair open in (BK) ground wire.
3. Power Circuit Open Test
1. Turn IGN OFF.
2. Connect BREAKOUT BOX (Part Number:HD-50390-1) and BCM CABLE (Part Number:HD-50390-2)
between wire harness [242B] and [242A].
3. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
4. Test resistance between BOB terminal M3 and [38-2] terminal HI (BE/W).
5. Is resistance less than 0.5 ohm?
a. Yes. Replace BCM.
b. No. Repair open in (BE/W) wire between BCM and headlamp.
Special Tools
Description
Part Number
Qty.
TEST CONNECTOR KIT
HD-41404
1
1.5 MM TERMINAL EXTRACTOR
HD-50424
1
TOOL
Table 1. DTC B2137 Diagnostic Faults
POSSIBLE CAUSES
Short to voltage in headlamp low beam circuit
1. Headlamp Test
1. Turn IGN OFF.
2. Disconnect BCM [242].
3. Using 1.5 MM TERMINAL EXTRACTOR TOOL (Part Number:HD-50424), remove terminal (M4) from [242B].
4. Connect BCM [242].
5. Turn IGN ON.
6. Using TEST CONNECTOR KIT (Part Number:HD-41404), test voltage between removed terminal (M4) and
ground.
7. Is voltage present?
a. Yes. Repair short to voltage in (BE/Y) wire.
b. No. Go to Test 2.
2. DTC Test
1. Install terminal M4 from [242B].
2. Connect [242].
3. Clear DTCs.
4. Turn IGN ON.
5. Observe headlamp in high and low beam positions.
6. Check DTCs.
7. Did DTC reset?
a. Yes. Replace BCM.
b. No. Condition is intermittent. See Wiggle Test.
Special Tools
Description
Part Number
Qty.
TEST CONNECTOR KIT
HD-41404
1
BREAKOUT BOX
HD-50390-1
1
BCM CABLE
HD-50390-2
1
BCM OVERLAY
HD-50390-2-P
1
Table 1. DTC B2138, B2139 Diagnostic Faults
POSSIBLE CAUSES
Short to ground in low beam headlamp circuit
Accessory lighting overloading circuit
Headlamp malfunction
1. Low Beam Headlamp Circuit Test
1. Turn IGN OFF.
2. Disconnect headlamp [38-2].
3. Connect BREAKOUT BOX (Part Number:HD-50390-1) and BCM CABLE (Part Number:HD-50390-2) to wire
harness [242B], leaving [242A] disconnected. See How To Use Diagnostic Tools.
4. Verify BCM OVERLAY (Part Number:HD-50390-2-P) is in position on BOB.
5. Using TEST CONNECTOR KIT (Part Number:HD-41404), test continuity between BOB terminal (M4) and
ground.
6. Is continuity present?
a. Yes. Repair short to ground in (BE/Y) wire.
b. No. Go to Test 2.
2. DTC Test
1. Connect [242].
2. Clear DTCs.
3. Turn IGN ON.
4. Check DTCs.
5. Did DTC reset?
a. Yes. Replace BCM.
b. No. Replace headlamp.
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