Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

1. CHECK INPUT 1 - 5 CIRCUIT FOR OPEN
   1. Turn ignition switch OFF.
   2. Disconnect BCM, combination switch, lighting switch and front fog lamps switch connectors.
   3. Check continuity between BCM connector and combination switch connector.

      Signal	BCM		Combination switch		Continuity
      	Connector	Terminal	Connector	Terminal
      Input 1	M18	6	M28	12	Yes
      Input 2		5		14
      Input 3		4		5
      Input 4		3		2
      Input 5		2		8

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

      Signal	BCM		Lighting switch		Continuity
      	Connector	Terminal	Connector	Terminal
      Input 4	M18	3	M34	6	Yes
      Input 5		2		5

   5. Check continuity between BCM connector and front fog lamps switch connector.

      Signal	BCM		Front fog lamps switch		Continuity
      	Connector	Terminal	Connector	Terminal
      Input 4	M18	3	M10	2	Yes

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair harnesses or connectors.

2. CHECK INPUT 1 - 5 CIRCUIT FOR SHORT

   Check for continuity between BCM connector and ground.

   Signal	BCM		Ground	Continuity
   	Connector	Terminal
   Input 1	M18	6		No
   Input 2		5
   Input 3		4
   Input 4		3
   Input 5		2

   Is the inspection result normal? 

   YES: Repair harnesses or connectors.

   NO: GO TO 3.

3. CHECK BCM INPUT SIGNAL
   1. Connect BCM, combination switch and lighting switch connectors.
   2. Turn ON any switch in the system that is malfunctioning.
   3. Check voltage between BCM connector and ground.

      Signal	Terminals			Voltage (Approx.)
      	(+)		(-)
      	BCM		Ground
      	Connector	Terminal
      Input 1	M18	6		Refer to "REFERENCE VALUE ".
      Input 2		5
      Input 3		4
      Input 4		3
      Input 5		2

      Is the inspection result normal? 

      Yes: Replace BCM. Refer to "REMOVAL AND INSTALLATION ".

      No: Replace malfunctioning switch.