Rear Window Defogger Circuit Check

1. Turn ignition switch OFF.
2. Disconnect rear window defogger connector.
3. Turn ignition switch ON.
4. Check voltage between rear window defogger connector and ground.
   Fig 1: Checking Rear Window Defogger Power Supply Circuit

   Courtesy of NISSAN MOTOR CO., U.S.A.
   REAR WINDOW DEFOGGER CIRCUIT VOLTAGE
   
   

   Connector	Terminal (Wire color)		Condition	Voltage (V) (Approx.)
   	(+)	(-)
   D104	1(W)	Ground	Rear window defogger switch ON.	Battery voltage
   			Rear window defogger switch OFF.	0

OK or NG

1. OK: GO TO 2.
2. NG: GO TO  3 .

1. Turn ignition switch OFF.
2. Check continuity between rear window defogger connector D114 terminal 2 and ground.
   Fig 2: Checking Rear Window Defogger Ground Circuit

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

   2 (B) - Ground: Continuity should exist. 

OK or NG

1. OK: Check filament. Refer to FILAMENT CHECK  .
   • If filament is OK, check condition of harness and connector.
   • If filament is NG, repair filament.
2. NG: Repair or replace harness between rear window defogger and ground.

1. Turn ignition switch OFF.
2. Remove rear window defogger relay.
3. Check continuity between rear window defogger relay connector E13 terminal 5, 7 and rear window defogger connector D104 terminal 1.
   Fig 3: Checking Rear Window Defogger Harness Continuity

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

   5 (B) - 1 (W): Continuity should exist. 

   7 (B) - 1 (W): Continuity should exist. 

   OK or NG

1. OK: Check condition of harness and connector.
2. NG: Repair or replace harness rear window defogger relay and condenser.