Rear Window Defogger and Door Mirror Defogger Circuit Check

CHECK FUSE
Check if any of the following fuses for Fuse block (J/B) are blown.

Fig 1: Identifying Fuses
Courtesy of NISSAN MOTOR CO., U.S.A.

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 SUPPLY ROUTING ".
CHECK REAR WINDOW DEFOGGER AND DOOR MIRROR DEFOGGER RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect rear window defogger and door mirror defogger relay.
3. Check voltage between rear window defogger and door mirror defogger relay connector B8 terminal 1, 3, 6 and ground.
  
  Fig 2: Voltage Specifications Between Rear Window Defogger And Door Mirror Defogger Relay Connector B8 Terminal 1, 3, 6 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Checking Voltage Between Rear Window Defogger And Door Mirror Defogger Relay Connector B8 Terminal 1, 3, 6 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK >> GO TO 3.
2. NG >> Check harness for open or short between rear window defogger and door mirror defogger relay and fuse.
REAR WINDOW DEFOGGER AND DOOR MIRROR DEFOGGER RELAY INSPECTION
With CONSULT-II
1. Connect the rear window defogger and door mirror defogger relay.
2. Check rear window defogger and door mirror defogger relay "REAR DEFOGGER RLY " in the ACTIVE TEST mode with CONSULT-II, check the operation.
  1. The operation sound of rear defogger relay is confirmed.
  Fig 4: Checking Rear Window Defogger And Door Mirror Defogger Relay With CONSULT-II
  Courtesy of NISSAN MOTOR CO., U.S.A.
Without CONSULT-II

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

Fig 5: Continuity Specifications Between Terminals 3 And 5, 6 And 7
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 6: Checking Continuity Between Terminals 3 And 5, 6 And 7
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.
CHECK REAR WINDOW DEFOGGER AND DOOR MIRROR DEFOGGER RELAY GROUND HARNESS
1. Turn ignition switch ON.
2. Turn rear window defogger switch OFF.
3. Installation rear window defogger and door mirror defogger relay.
4. Check voltage between BCM connector B4 terminal 144 and ground.
  1. 144 (G/W) - Ground : Battery voltage
Fig 7: Checking Voltage Between BCM Connector B4 Terminal 144 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK >> GO TO 5.
2. NG >> GO TO 6 .
CHECK HARNESS CONTINUITY
1. Turn ignition switch OFF.
2. Disconnect condenser and rear window defogger remove door mirror defogger relay connectors.
3. Check continuity between condenser B25 terminal 1 and rear window and door mirror defogger relay connector B8 terminal 7.
  1. 1 (LR) - 7 (L/R) :Continuity should exist.
OK or NG
1. OK >> Check the condition of the harness and the connector.
2. NG >> Repair or replace harness between condenser and rear window defogger and door mirror defogger relay.
CHECK BCM HARNESS
1. Turn ignition switch OFF.
2. Disconnect BCM and rear window defogger and door mirror defogger relay connectors.
3. Check continuity between BCM connector B4 terminal 144 and rear window defogger and door mirror defogger relay connector B8 terminal 2.
  1. 144 (G/W) - 2 (G/W) :Continuity should exist.
OK or NG
1. OK >> Check the condition of the harness and the connector.
2. NG >> Repair or replace harness between BCM and rear window defogger and door mirror defogger relay.