Check Rear Window Defogger Switch Circuit

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: CONSULT-II Display - Rear DEF SW, IGN ON SW

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

Without CONSULT-II 

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

   Connector	Terminal (Wire color)		Condition	Voltage (V) (Approx.)
   	(+)	(-)
   M3	9 (L/W)	Ground	Rear window defogger switch is pressed.	0
   			Rear window defogger switch is OFF.	5

   Fig 2: Identifying Voltage Between BCM Connector Terminal 9 And Ground

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

OK or NG 

OK : Rear window defogger switch is OK.

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 M3 terminal 9 and A/ C and AV switch connector M64 terminal 16.

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

   Fig 3: Identifying Continuity Between BCM Connector M3 Terminal 9 And A/ C And AV Switch Connector M64 Terminal 16

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

OK or NG 

OK : GO TO 3.

NG : Repair or replace harness.

1. Connect BCM connector.
2. Turn ignition switch ON.
3. Check voltage between BCM connector M3 terminal 9 and ground.

   9 (L/W) - Ground : Approx. 5 

   Fig 4: Identifying Voltage Between BCM Connector M3 Terminal 9 And Ground

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

OK or NG 

OK : Replace A/C and AV switch.

NG : Replace BCM.