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Acura CSX. Manual - part 528

＊０１

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−

DTC B1279:

YES

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

When the combination light switch is turned OFF

YES

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)

Headlight Switch (High beam)

OFF

Data List

Value

Headlight Switch (PASSING)

OFF

Headlight Switch (High beam)

Headlight Switch (HEADLIGHT)

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

−

YES

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)

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

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

1, 11, 13, 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

Is the combination light switch OK ?

Is ther e continuity?

08/08/21 14:26:58 61SNR030_220_0164

＊０１

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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

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.

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

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

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

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

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