Dodge Dakota (ND). Manual — part 298
B166C-LEFT TRAILER TOW LAMP CONTROL CIRCUIT HIGH (CONTINUED)
For the Exterior Lighting system circuit diagram (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - EXTERIOR -
SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
•
With the Trailer Tow Lamps activated.
•
Set Condition:
•
When the FCM detects a LOW condition.
Possible Causes
LEFT TRAILER TOW RELAY
MODULE-POWER DISTRIBUTION
FRONT CONTROL MODULE
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
Diagnostic Test
1.
INTERMITTENT CONDITION
Turn the ignition on.
With the Scan Tool, clear all FCM DTC’s.
Actuate the Trailer Tow Lamps.
With the Scan Tool read the DTC information.
Does the Scan Tool read: B166C-LEFT TRAILER TOW LAMP
CONTROL CIRCUIT HIGH?
Yes
>> Go To 2
No
>> The condition that caused the symptom is currently not
present. Inspect the related wiring for a possible intermit-
tent condition. Look for any chafed, pierced, pinched, or
partially broken wires.
Perform the BODY VERIFICATION TEST-VER1.
2.
LEFT TRAILER TOW RELAY
Turn the ignition off.
Remove and install a known good relay in place of the Left Trailer Tow Relay.
Do the Trailer Tow Lamps operate normally?
Yes
>> Replace the Left Trailer Tow Relay in accordance with the service information.
Perform the BODY VERIFICATION TEST VER1.
No
>> Go To 3
8L - 54
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
ND
B166C-LEFT TRAILER TOW LAMP CONTROL CIRCUIT HIGH (CONTINUED)
3.
FRONT CONTROL MODULE
Turn the ignition off.
Remove the Left Trailer Tow Relay from the MPD.
Remove the FCM from the Module Power Distribution.
Measure the voltage of the (L655) Left Trailer Tow Relay Output circuit
and ground.
Is the voltage above 1.0 volts?
Yes
>> Replace the Module Power Distribution center in accor-
dance with the service information.
Perform the BODY VERIFICATION TEST-VER1.
No
>> Replace the Module Front Control in accordance with the
service information.
Perform the BODY VERIFICATION TEST-VER1.
ND
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
8L - 55
B166F-RIGHT TRAILER TOW LAMP CONTROL CIRCUIT LOW
8L - 56
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
ND
B166F-RIGHT TRAILER TOW LAMP CONTROL CIRCUIT LOW (CONTINUED)
For the Exterior Lighting System circuit diagram (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - EXTERIOR -
SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Continuously
•
Set Condition:
When the Front Control Module does not detect voltage on the Trailer Tow Relay Control circuit.
Possible Causes
PDM FUSE 21
B(+) OPEN
RIGHT TRAILER TOW RELAY
POWER DISTRIBUTION CENTER
FRONT CONTROL MODULE
Diagnostic Test
1.
INTERMITTENT CONDITION
Turn the ignition on.
With the scan tool, clear all FCM DTC’s
Actuate the Trailer Tow Lamps.
With the scan tool, read DTC’s.
Does the scan tool read: B166F-RIGHT TRAILER TOW LAMP
CONTROL CIRCUIT LOW?
Yes
>> Go To 2
No
>> The conditions that caused this code to set are not
present at this time. Using the wiring diagram/schematic
as a guide, inspect the wiring and connectors.
Perform BODY VERIFICATION TEST - VER 1.
2.
PDM FUSE 21
Using a 12-volt test light connected to ground, check the PDM Fuse 21.
Does the test light illuminate and was the fuse OK?
No
>> Replace the PDM Fuse 21 if open and check for a short to ground on the Relay Output circuit or correct
the open B(+) circuit to the fuse.
Perform BODY VERIFICATION TEST - VER 1.
Yes
>> Go To 3
ND
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
8L - 57
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