Diagnosis Procedure

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

1. CHECK INPUT 1 - 5 SYSTEM CIRCUIT FOR OPEN
   1. Turn ignition switch OFF.
   2. Disconnect BCM and combination switch.
   3. Check continuity between BCM harness connector and combination switch harness connector.
      CONTINUITY SPECIFICATION
      
      

      System	BCM		Combination switch		Continuity
      	Connector	Terminal	Connector	Terminal
      INPUT 1	M18 (A)	6	M28 (B)	6	Yes
      INPUT 2		5		7
      INPUT 3		4		10
      INPUT 4		3		9
      INPUT 5		2		8

      Fig 1: Checking Continuity Between BCM Harness Connector And Combination Switch Harness Connector

      Courtesy of NISSAN MOTOR CO., U.S.A.

      Does continuity exist? 

      YES: GO TO  2

      NO: Repair or replace harness.

2. CHECK INPUT 1 - 5 SYSTEM CIRCUIT FOR SHORT

   Check for continuity between BCM harness connector and ground.

   CONTINUITY SPECIFICATION
   
   

   System	BCM		Ground	Continuity
   	Connector	Terminal
   INPUT 1	M18	6		No
   INPUT 2		5
   INPUT 3		4
   INPUT 4		3
   INPUT 5		2

   Fig 2: Checking Continuity Between BCM Harness Connector And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.

   Does continuity exist? 

   YES: Repair or replace harness.

   NO: GO TO  3

3. CHECK BCM OUTPUT VOLTAGE
   1. Connect BCM.
   2. Turn ignition switch ON.
   3. Check voltage between BCM harness connector and ground.
      Fig 3: Checking Voltage Between BCM Harness Connector And Ground

      Courtesy of NISSAN MOTOR CO., U.S.A.
      VOLTAGE SPECIFICATION
      
      

      System	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 measurement value normal? 

      YES: GO TO  4

      NO: Replace BCM. Refer to "REMOVAL AND INSTALLATION ".

4. CHECK COMBINATION SWITCH

   Check combination switch. Refer to "DESCRIPTION ".

   Is the check result normal? 

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

   NO: Replace the combination switch (applicable parts). Refer to "REMOVAL AND INSTALLATION ".