Rear Window Defogger Circuit Check

Check if any of the following fuses in IPDM E/R are blown.

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 "COMPONENT PARTS AND HARNESS CONNECTOR LOCATION ".

1. Turn ignition switch ON.
2. Check voltage between IPDM E/R connector E124 terminal 60 and ground.

   60 - Ground: Battery voltage 

Fig 1: Checking Voltage Between IPDM E/R Connector E124 Terminal 60 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

OK: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION OF IPDM E/R ".

NG: GO TO 3.

1. Turn ignition switch OFF.
2. Disconnect IPDM E/R and rear window defogger cut-off relay.
3. Check continuity between IPDM E/R connector E124 terminal 60 and rear window defogger cut-off relay connector M152 terminal 2.

   2 - 60: Continuity should exist. 

4. Check continuity between IPDM E/R connector E124 terminal 60 and rear window defogger cut-off relay connector M152 terminal 3.

   3 - 60: Continuity should exist. 

   Fig 2: Checking Continuity IPDM E/R Connector E124 Terminal 60 And Rear Window Defogger Cut-Off Relay Connector M152 Terminals 2, 3

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

OK or NG 

OK: GO TO 4.

NG: Repair or replace harness.

1. Disconnect rear window defogger cut-off relay.
2. Check continuity between rear window defogger cut-off relay terminals 3 and 5.
   Fig 3: Checking Continuity Between Rear Window Defogger Cut-Off Relay Terminals 3 & 5

   Courtesy of NISSAN MOTOR CO., U.S.A.
   CONNECTOR TERMINAL CONTINUITY CHECK CHART
   
   

   Condition	Continuity
   12V direct current supply between terminals 1 and 2	Yes
   No current supply	No

OK or NG 

OK: GO TO 5.

NG: Replace rear window defogger cut-out relay.

1. Place rear power drop glass in the closed (UP) position.
2. Check continuity between rear window defogger cut-off relay connector M152 terminal 1 and ground.

   1 - Ground: Continuity should exist. 

Fig 4: Checking Continuity Between Rear Window Defogger Cut-Off Relay Connector M152 Terminal 1 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

OK: GO TO  7.

NG: GO TO 6.

1. Disconnect rear power drop glass motor (def cut-off switch).
2. Check continuity between rear power drop glass motor (def cutoff switch) terminals 2 and 3.
   Fig 5: Checking Continuity Between Rear Power Drop Glass Motor Terminals 2 & 3

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

   Terminal		Rear power drop glass position	Continuity
   2	3	Closed (UP)	Yes
   		Open (DOWN) more than 18 mm	No

OK or NG 

OK: Repair or replace harness.

NG: Replace rear power drop glass motor (def cut-off switch). Refer to "REAR WINDOW GLASS AND REGULATOR ".

1. Disconnect rear window defogger.
2. Turn ignition switch ON.
3. Check voltage between rear window defogger connector B77 terminal 1 and ground.
   Fig 6: Checking Voltage Between Rear Window Defogger Connector B77 Terminal 1 And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
   CONNECTOR TERMINAL VOLTAGE CHART
   
   

   Connector	Terminals		Condition	Voltage (V) (Approx.)
   	(+)	(-)
   B77	1	Ground	Rear window defogger switch ON.	Battery voltage
   			Rear window defogger switch OFF.	0

OK or NG 

OK: GO TO 8.

NG: Repair or replace harness.

1. Disconnect rear window defogger ground.
2. Turn ignition switch OFF.
3. Check continuity between rear window defogger connector B78 terminal 2 and ground.

   2 - Ground: Continuity should exist. 

Fig 7: Checking Continuity Between Rear Window Defogger Connector B78 Terminal 2 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

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.