Rear Window Defogger Switch Circuit Check

With CONSULT-II

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

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

Fig 1: CONSULT-II Data Monitor Display

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With out CONSULT-II 

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

Fig 2: BCM Connector And Ground Voltage Table

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Fig 3: Checking Voltage Between BCM Connector 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 audio controller connector.
3. Check continuity between BCM connector M3 terminal 69 and A/C and audio controller connector M38 terminal 12.
   1. 69 (L/R) - 12 (L/R): Continuity should exist 
4. Check continuity between BCM connector M3 terminal 69 and ground
   1. 69 (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.

Fig 4: Checking Continuity Between BCM Connector And A/C And Audio Controller Connector

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

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: A/C And Audio Controller Connector Continuity Table

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

Fig 6: Checking Continuity Between A/C And Audio Controller Connector

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.