Rear Window Defogger Switch Circuit Check

With CONSULT-II 

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

Fig 1: Identifying Rear Defogger Switch And Ignition On Switch In Data Monitor Mode

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

1. When rear defogger switch is turned to ON
2. REAR DEF SW: ON
3. When ignition switch is turned to ON
4. IGN ON SW: ON

Without CONSULT-II 

1. Turn ignition switch ON.
2. Check voltage between BCM connector and ground.
   Fig 2: Checking Voltage Between BCM Connector And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
   Fig 3: BCM Connector Terminal Voltage Specifications

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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 audio controller connector.
3. Check continuity between BCM connector M1 terminal 9 and A/C and audio controller connector M38 terminal 12.
   Fig 4: Checking Continuity Between BCM Connector And A/C-Audio Controller

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   1. 9 (L/R) - 12(L/R): Continuity should exist 
4. Check continuity between BCM connector M1 terminal 9 and ground.
   1. 9 (L/R) - Ground: Continuity should not exist 

OK or NG 

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

1. Connect A/C and audio controller connector.
2. Check continuity between A/C and audio controller connector M38 terminal 3 and 12.
   Fig 5: Checking Continuity At A/C And Audio Controller Connector

   Courtesy of NISSAN MOTOR CO., U.S.A.
   Fig 6: A/C And Audio Controller Continuity Specifications

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

OK or NG 

1. OK: Rear window defogger switch circuit is OK.
2. NG: Replace A/C and audio controller.