Acura CSX. Manual — part 528
*01
SNR9A0GK763000Y1279FAAT00
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−
−
−
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DTC B1279:
YES
NO
When the passing switch is operated
When the headlight switch is turned ON, and the
dimmer switch changed from low beam to high
beam
YES
NO
When the combination light switch is turned OFF
YES
NO
YES
NO
22-161
UNDER-DASH FUSE/RELAY BOX CONNECTOR S (20P)
DIMMER SW
(LT BLU)
H/L ON
SW (PNK)
PASSING
SW (RED)
Headlight Switch DIMMER
Position Circuit Malfunction
NOTE: If you are troubleshooting multiple DTCs, be
sure to follow the instructions in B-CAN System
Diagnosis Test Mode A (see page 22-93).
1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back
to ON (II).
3. Turn the combination light (headlight) switch ON.
4. Change the dimmer switch from low beam to high
beam.
5. Turn the combination light switch OFF, and then to
the passing position, and wait for at least 6 seconds.
6. Check for DTCs with the HDS.
Go to step 7.
Intermittent failure, the system is OK at this
time. Check for loose or poor connections.
7. Select LIGHTING from the BODY ELECTRICAL
system select menu, then enter DATA LIST.
8. Check each combination light switch position value
with the DATA LIST menu.
Data List
Value
Headlight Switch (PASSING)
ON
Headlight Switch (High beam)
OFF
Data List
Value
Headlight Switch (PASSING)
OFF
Headlight Switch (High beam)
ON
Headlight Switch (HEADLIGHT)
ON
Faulty MICU; replace the under-dash fuse/
relay box (see page 22-66).
Go to step 9.
9. Turn the ignition switch to LOCK (0).
10. Disconnect the combination light switch 12P
connector.
11. Turn the ignition switch to ON (II).
12. Select LIGHTING from the BODY ELECTRICAL
system select menu, then enter DATA LIST.
13. Check each combination light switch position value
with the DATA LIST menu.
Data List
Value
Headlight Switch (PASSING)
OFF
Headlight Switch (High beam)
OFF
Headlight Switch (HEADLIGHT)
OFF
Go to step 17.
Go to step 14.
14. Turn the ignition switch to LOCK (0).
15. Disconnect under-dash fuse/relay box connector S
(20P).
16. Check for continuity between body ground and
under-dash fuse/relay box connector S (20P)
terminals No. 11, No. 12, and No. 16 individually.
Repair a short to ground in the wire.
Faulty MICU; replace the under-dash fuse/
relay box (see page 22-66).
Wire side of female terminals
Is DT C B127 9 indicated?
Ar e all data list values cor r ect?
Ar e all data list values indicated OF F ?
Is ther e continuity?
08/08/22 16:38:06 61SNR030_220_0163
*02
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YES
NO
YES
NO
YES
NO
22-162
Exterior Lights
COMBINATION LIGHT SWITCH 12P CONNECTOR
COMBI GND (BLK)
H/L ON
SW (PNK)
UNDER-DASH FUSE/RELAY BOX CONNECTOR S (20P)
COMBI GND
(BLK)
H/L ON SW (PNK)
PASSING
SW (RED)
PASSING
SW (RED)
DIMMER SW (LT BLU)
DIMMER SW
(LT BLU)
17. Turn the ignition switch to LOCK (0).
18. Do the combination light switch test (see page
22-166).
Go to step 19.
Replace the combination light switch.
19. Disconnect under-dash fuse/relay box connector S
(20P).
20. Check for continuity between under-dash fuse/relay
box connector S (20P) terminals and the
combination light switch 12P connector terminals
as shown:
Under-dash fuse/
relay box connector
S (20P)
Combination light
switch 12P connector
5
12
11
10
12
6
16
4
Go to step 21.
Repair an open in the wire.
21. Check for continuity between under-dash fuse/relay
box connector S (20P) terminals as shown:
From terminal
To terminal
12
1, 11, 13, 16
16
1, 11, 13
Repair a short between the wires.
Faulty MICU; replace the under-dash fuse/
relay box (see page 22-66).
Wire side of female terminals
Wire side of female terminals
Is the combination light switch OK ?
Is ther e continuity?
Is ther e continuity?
08/08/21 14:26:58 61SNR030_220_0164
*01
SNR9A00J32100041951FCAT00
22-163
MICU Input Test
UNDER-DASH FUSE/RELAY BOX CONNECTOR E (42P)
BLK
RED
GRN
WHT
ORN
PNK
PUR
WHT
GRY
LT BLU
UNDER-DASH FUSE/RELAY BOX CONNECTOR F (34P)
UNDER-DASH FUSE/RELAY BOX CONNECTOR G (21P)
UNDER-DASH FUSE/RELAY BOX CONNECTOR S (20P)
UNDER-DASH FUSE/RELAY BOX CONNECTOR T (34P)
BLK
BLK
BLK
RED
RED
RED
ORN
PNK
BLK
NOTE:
• The MICU turns on the headlights (high beams) in a dimming mode for the Daytime Running Lights under the
following conditions:
– With the ignition switch turned to ON (II)
– The headlight switch OFF
– The parking brake is released (parking brake switch OFF)
• The DRL indicator will come on when one of the headlight (high beams) bulbs is blown, or if the high beam wiring
has an open circuit with the daytime running lights ON.
• If the vehicle is equipped with an optional remote control engine start system, the daytime running lights will not
function when started with the remote start.
1. Before testing the lighting system, troubleshoot the system using B-CAN System Diagnosis Test Mode A
(see page 22-93).
2. Check the No. 12 (10 A), No. 13 (10 A), No. 15 (7.5 A), No. 16 (15 A) , (10 A) , No. 17 (15 A) , (10 A) , No. 18
(20 A), No. 19 (15 A), No. 21 (30 A) , (20 A) , and No. 37 (7.5 A) fuses in the under-dash fuse/relay box. If any fuse
is blown, replace it and go to step 3.
1: With HID
2: Without HID
3. Disconnect under-dash fuse/relay box connectors E, F, G, S, and T.
NOTE: All connector views are shown from wire side of female terminals.
1
2
1
2
1
2
08/08/21 14:26:58 61SNR030_220_0165
Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result
is not obtained
22-164
Exterior Lights
4. Inspect the connector and socket terminals to be sure they are all making good contact.
• If the terminals are bent, loose or corroded, repair them as necessary and recheck the system.
• If the terminals look OK, go to step 5.
5. With the connector still disconnected, do these input tests at the following connectors.
• If any test indicates a problem, find and correct the cause, then recheck the system.
• If all the input tests prove OK, go to step 6.
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E19
RED
Under all conditions
Connect battery power to terminal
E19:
The taillights, rear side marker
lights, and license plate lights
should come on.
Poor ground (G701)
Blown bulb
An open in the wire
F3
RED
Under all conditions
Connect battery power to terminal
F3:
The right front side marker light
and right front parking light
should come on.
Poor ground (G201)
Blown bulb
An open in the wire
F4
GRN
Under all conditions
Connect battery power to terminal
F4:
The right headlight (low beam)
should come on.
Poor ground (G201)
Blown bulb
Faulty HID unit
An open in the wire
F22
WHT
Under all conditions
Connect battery power to terminal
F22:
The right headlight (high beam)
should come on.
Poor ground (G201)
Blown bulb
An open in the wire
G5
RED
Under all conditions
Connect battery power to terminal
G5:
The left front side marker light
and left front parking light should
come on.
Poor ground (G301)
Blown bulb
An open in the wire
G15
PNK
Under all conditions
Connect battery power to terminal
G15:
The left headlight (high beam)
should come on.
Poor ground (G301)
Blown bulb
An open in the wire
G17
PUR
Under all conditions
Connect battery power to terminal
G17:
The left headlight (low beam)
should come on.
Poor ground (G301)
Blown bulb
Faulty HID unit
An open in the wire
: With HID
08/08/21 14:26:58 61SNR030_220_0166
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