Rear Window Defogger Power Supply Circuit Check

WARNING: This page is about a different car, the 2005 Nissan 350Z. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSE
Check 10A fuse [No. 12, located in fuse block (J/B)].

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

OK or NG
- OK: GO TO 2.
- NG: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse, refer to "POWER SUPPLY ROUTING CIRCUIT ".
REAR WINDOW DEFOGGER RELAY POWER SUPPLY CIRCUIT INSPECTION
1. Turn ignition switch OFF.
2. Remove rear window defogger relay.
3. Check voltage between rear window defogger relay connector B34 terminal 1 and ground.
  - 1 (G or P) - Ground: Battery voltage
OK or NG
- OK: GO TO 3.
- NG: Repair or replace harness.
Fig 1: Rear Window Defogger Relay Connector B34 Terminal 1 & Ground Voltage Test
Courtesy of NISSAN MOTOR CO., U.S.A.
REAR WINDOW DEFOGGER RELAY INSPECTION
1. Remove rear window defogger relay.
2. Check continuity between rear window defogger relay terminals 3 and 5, 6 and 7.
  
  Fig 2: Rear Window Defogger Relay Terminals 3 & 5, 6 & 7 Continuity Specifications Table
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Rear Window Defogger Relay Terminals 3 & 5, 6 & 7 Continuity Test
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 4.
- NG: Replace rear window defogger relay.
REAR WINDOW DEFOGGER RELAY GROUND CIRCUIT INSPECTION
1. Installation rear window defogger relay.
2. Turn ignition switch ON.
3. Turn rear window defogger switch OFF.
4. Check voltage between IPDM E/R connector E9 terminal 52 and ground.
  - 52 (G/R) - Ground: Battery voltage
OK or NG
- OK: Rear window defogger power supply circuit is OK.
- NG: GO TO 5.
Fig 4: IPDM E/R Connector E9 Terminal 52 & Ground Voltage Test
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK HARNESS CONTINUITY
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector and rear window defogger relay.
3. Check continuity between IPDM E/R connector E9 terminal 52 and rear window defogger relay connector B34 terminal 2.
  - 52 (G/R) - 2 (G/R or G): Continuity should exist.
OK or NG
- OK: Check the condition of harness and the connector.
- NG: Repair or replace harness.
Fig 5: IPDM E/R Connector E9 Terminal 52 & Rear Window Defogger Relay Connector B34 Terminal 2 Continuity Test
Courtesy of NISSAN MOTOR CO., U.S.A.