Rear Window Defogger and Door Mirror Defogger Circuit Check

1. Turn ignition switch OFF.
2. Check if the following fuse for Fuse block (J/B) is blown.
   FUSE CONDITION INSPECTION CHART
   
   

   COMPONENT PARTS	TERMINAL NO. (SIGNAL)	AMPERE	FUSE NO.
   Fuse block (J/B)	2J (IGN power supply)	10A	#1

   NOTE: Refer to "COMPONENT PARTS AND HARNESS CONNECTOR LOCATION  ".

OK or NG 

1. OK: GO TO 2.
2. NG: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse, refer to POWER DISTRIBUTION .

1. Disconnect rear window defogger and door mirror defogger relay.
2. Turn ignition switch ON.
3. Check voltage between rear window defogger and door mirror defogger relay harness connector B8 terminal 1 (W/G) and ground.
   1. 1 (W/G) - Ground: Battery voltage 
   Fig 1: Checking Voltage Between Rear Window Defogger And Door Mirror Defogger Relay Harness Connector & Ground

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

OK or NG 

1. OK: GO TO 3.
2. NG: Repair or replace harness between fuse block (J/B) and rear window defogger and door mirror defogger relay.

Check continuity between terminals 3 and 5, 6 and 7.

Fig 2: Checking Rear Window Defogger And Door Mirror Defogger Relay

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

Fig 3: Terminals Continuity Specifications

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

OK or NG 

1. OK: GO TO 4.
2. NG: Replace rear window defogger and door mirror defogger relay.

1. Turn ignition switch OFF.
2. Installation rear window defogger and door mirror defogger relay.
3. Turn ignition switch ON.
4. Check voltage between BCM connector terminal 144 (G/W) and ground.
   1. 144 (G/W) - Ground: Battery voltage 
   Fig 4: Checking Rear Window Defogger And Door Mirror Defogger Relay Ground Harness

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

OK or NG 

1. OK: Rear window defogger and door mirror defogger circuit is OK.
2. NG: Repair or replace harness between rear window defogger and door mirror defogger relay and BCM.