DTC B10A6:92 [BCM]

id0902f5389900

Description

• Light switch circuit malfunction

Detection Condition

• Short to ground in wiring harness between light switch and BCM for 2 s or more.

Possible Causes

• Light switch connector or terminals malfunction

• Light switch malfunction

• BCM connector or terminals malfunction

• Short to ground in wiring harness between the following terminals:

― Light switch left side

• Light switch terminal J―BCM terminal 6O

• Light switch terminal H―BCM terminal 6I

• Light switch terminal D―BCM terminal 6J

• Light switch terminal K―BCM terminal 6L

― Light switch right side

• Light switch terminal F―BCM terminal 6O

• Light switch terminal H―BCM terminal 6I

• Light switch terminal L―BCM terminal 6J

• Light switch terminal C―BCM terminal 6L

• BCM malfunction

System Wiring Diagram

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Diagnostic Procedure

Step

Inspection

Action

1

VERIFY BCM DTCs

•  Clear the DTCs using the M-MDS.
(See CLEARING DTC [BCM].)

•  Turn the light switch to the AUTO position, then TNS position, then HEAD position.

•  Perform the BCM DTC inspection using the M-MDS.
(See DTC INSPECTION [BCM].)

•  Is the same DTC present?

Yes

Go to the next step.

No

Go to Step 7.

2

INSPECT LIGHT SWITCH CONNECTOR AND TERMINALS

•  Turn the ignition switch to the LOCK position.

•  Disconnect the negative battery cable.

•  Disconnect the light switch connector.

•  Inspect the connector and terminals (corrosion, damage, pin disconnection).

•  Is there any malfunction?

Yes

Repair or replace the connector or terminals, then go to Step 6.

No

Go to the next step.

3

INSPECT LIGHT SWITCH

•  Inspect the light switch.
(See LIGHT SWITCH INSPECTION.)

•  Is there any malfunction?

Yes

Replace the light switch, then go to Step 6.

(See LIGHT SWITCH REMOVAL/INSTALLATION.)

No

Go to the next step.

4

INSPECT BCM CONNECTOR AND TERMINALS

•  Disconnect the BCM connector.

•  Inspect the connector and terminals (corrosion, damage, pin disconnection).

•  Is there any malfunction?

Yes

Repair or replace the connector or terminals, then go to Step 6.

No

Go to the next step.

5

INSPECT LIGHT SWITCH CIRCUIT FOR SHORT TO GROUND

•  Verify that the light switch and BCM connectors are disconnected.

•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:

―  Light switch left side

•  Light switch terminal J

•  Light switch terminal H

•  Light switch terminal D

•  Light switch terminal K

―  Light switch right side

•  Light switch terminal F

•  Light switch terminal H

•  Light switch terminal L

•  Light switch terminal C

•  Is there continuity?

Yes

Repair or replace the wiring harness for a possible short to ground, then go to the next step.

No

Go to the next step.

6

VERIFY TROUBLESHOOTING COMPLETED

•  Make sure to reconnect all disconnected connectors.

•  Reconnect the negative battery cable.

•  Clear the DTCs using the M-MDS.
(See CLEARING DTC [BCM].)

•  Turn the light switch to the AUTO position, then TNS position, then HEAD position.

•  Perform the BCM DTC inspection using the M-MDS.
(See DTC INSPECTION [BCM].)

•  Is the same DTC present?

Yes

Repeat the inspection from Step 1.

•  If the malfunction recurs, replace the BCM.
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

Go to the next step.

No

Go to the next step.

7

VERIFY THAT NO OTHER DTCs ARE PRESENT

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [BCM].)

No

DTC troubleshooting completed.

Step	Inspection		Action
1	VERIFY BCM DTCs • Clear the DTCs using the M-MDS. (See CLEARING DTC [BCM].) • Turn the light switch to the AUTO position, then TNS position, then HEAD position. • Perform the BCM DTC inspection using the M-MDS. (See DTC INSPECTION [BCM].) • Is the same DTC present?	Yes	Go to the next step.
1		No	Go to Step 7.
2	INSPECT LIGHT SWITCH CONNECTOR AND TERMINALS • Turn the ignition switch to the LOCK position. • Disconnect the negative battery cable. • Disconnect the light switch connector. • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 6.
2		No	Go to the next step.
3	INSPECT LIGHT SWITCH • Inspect the light switch. (See LIGHT SWITCH INSPECTION.) • Is there any malfunction?	Yes	Replace the light switch, then go to Step 6. (See LIGHT SWITCH REMOVAL/INSTALLATION.)
3		No	Go to the next step.
4	INSPECT BCM CONNECTOR AND TERMINALS • Disconnect the BCM connector. • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 6.
4		No	Go to the next step.
5	INSPECT LIGHT SWITCH CIRCUIT FOR SHORT TO GROUND • Verify that the light switch and BCM connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― Light switch left side • Light switch terminal J • Light switch terminal H • Light switch terminal D • Light switch terminal K ― Light switch right side • Light switch terminal F • Light switch terminal H • Light switch terminal L • Light switch terminal C • Is there continuity?	Yes	Repair or replace the wiring harness for a possible short to ground, then go to the next step.
5		No	Go to the next step.
6	VERIFY TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Reconnect the negative battery cable. • Clear the DTCs using the M-MDS. (See CLEARING DTC [BCM].) • Turn the light switch to the AUTO position, then TNS position, then HEAD position. • Perform the BCM DTC inspection using the M-MDS. (See DTC INSPECTION [BCM].) • Is the same DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.) Go to the next step.
6		No	Go to the next step.
7	VERIFY THAT NO OTHER DTCs ARE PRESENT • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [BCM].)
7		No	DTC troubleshooting completed.