Rear Window Defogger Switch Circuit Check

With CONSULT-II 

Check ("REAR DEF SW", "IGN ON SW") in DATA MONITOR mode with CONSULT-II.

When rear window defogger switch is turned to ON 

REAR DEF SW: ON 

When ignition switch is turned to ON 

IGN ON SW: ON 

Fig 1: Displaying Data Monitor

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

With out CONSULT-II 

1. Turn ignition switch ON.
2. Check voltage between BCM connector and ground.
   VOLTAGE CHECK CHART
   
   

   Connector	Terminal (Wire color)		Condition	Voltage (V) (Approx.)
   	(+)	(-)
   M34	9 (G/W)	Ground	Rear window defogger switch is pressed.	0
   			Rear window defogger switch is OFF.	5

   Fig 2: Checking Voltage Between BCM Connector And Ground

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

OK or NG

1. OK: Rear window defogger switch check is OK.
2. NG: GO TO 2.

1. Turn ignition switch OFF.
2. Disconnect BCM and A/C and AV switch connector.
3. Check continuity between BCM connector M34 terminal 9 and A/C and AV switch connector M48 terminal 16.

   9 (G/W) - 16 (G/W): Continuity should exist. 

   Fig 3: Checking Continuity Between BCM Connector M34 Terminal 9 And A/C And AV Switch Connector M48 Terminal 16

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

OK or NG

1. OK: GO TO 3.
2. NG: Repair or replace harness between BCM and A/C and AV switch.

1. Connect BCM connector.
2. Turn ignition switch ON.
3. Check voltage between BCM connector M34 terminal 69 and ground.

   9 (G/W) - Ground: Approx. 5 

   Fig 4: Checking Voltage Between BCM Connector M34 Terminal 69 And Ground

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

OK or NG

1. OK: Replace A/C and AV switch.
2. NG: Replace BCM.