Body Control System (DTC/Circuit Diagnosis)

1. Turn ignition switch OFF.
2. Disconnect BCM, combination switch, lighting switch and front fog switch (if equipped) connectors.
3. Check continuity between BCM connector and combination switch connector.

   Combination switch signal	BCM		Combination switch		Continuity
   	Connector	Terminal	Connector	Terminal
   Input 1	M19	79	M28	11	Yes
   Input 2		78		9
   Input 3		77		7
   Input 4		76		10
   Input 5		75		13

4. Check continuity between BCM connector and lighting switch connector.

   Lighting switch signal	BCM		Lighting switch		Continuity
   	Connector	Terminal	Connector	Terminal
   Input 2	M19	78	M59	2	Yes
   Input 3		77		3
   Input 4		76		4

5. Check continuity between BCM connector and front fog lamps switch connector (if equipped).

   Front fog switch signal	BCM		Front fog switch		Continuity
   	Connector	Terminal	Connector	Terminal
   Input 5	M19	75	M16	1	Yes

Is the inspection result normal?

YES

GO TO 2

NO

Repair or replace harness or connectors.

Check for continuity between BCM connector and ground.

Is the inspection result normal?

YES

GO TO 3.

NO

Repair or replace harness or connectors.

1. Connect BCM connector.
2. Check voltage between BCM connector and ground.

   Switch signal	Terminals			Voltage (Approx.)
   	(+)		(-)
   	BCM		Ground
   	Connector	Terminal
   Input 1	M19	79		Refer to Reference Value .
   Input 2		78
   Input 3		77
   Input 4		76
   Input 5		75

Is the inspection result normal?

YES

Replace malfunctioning switch.

NO

Replace BCM. Refer to Removal and Installation .