Rear Window Defogger Circuit Check

CHECK REAR WINDOW DEFOGGER POWER SUPPLY CIRCUIT 1

Turn ignition switch OFF.
Disconnect condenser.
Turn ignition switch ON.
Check voltage between condenser connector and ground.

TERMINALS VOLTAGE REFERENCE CHART

Connector	Terminals		Condition	Voltage (V) (Approx.)
Connector	(+)	(-)	Condition	Voltage (V) (Approx.)
B21	1	Ground	Rear window defogger switch ON.	Battery voltage
B21	1	Ground	Rear window defogger switch OFF.	0

Fig 1: Identifying Voltage Between Condenser Connector And Ground

G04162645

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

OK or NG

OK: GO TO 2.

NG: GO TO 3.

CHECK REAR WINDOW DEFOGGER GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between rear window defogger connector B351 terminal - and ground.
  - - Ground: Continuity should exist .
OK or NG

OK: Check filament. Refer to "FILAMENT CHECK ".
- If filament is OK.
  Check the condition of the harness and the connector.
- If filament is NG.
  Repair filament.
NG: Repair or replace harness.

Fig 2: Identifying Continuity Between Rear Window Defogger Connector B351 Terminal - And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK CONDENSER HARNESS
1. Turn ignition switch OFF.
2. Disconnect rear window defogger relay.
3. Check continuity between rear window defogger relay connector B4 terminal 5 and condenser connector B21 terminal 1.
  5 - 1: Continuity should exist .
OK or NG

OK: Check the condition of the harness and the connector.

NG: Repair or replace harness.

Fig 3: Identifying Continuity Between Rear Window Defogger Relay Connector B4 Terminal 5 And Condenser Connector B21 Terminal 1
Courtesy of NISSAN MOTOR CO., U.S.A.