Check Rear Window Defogger Circuit

1. Turn ignition switch ON.
2. Check voltage between rear window defogger connector and ground.
   VOLTAGE SPECIFICATION
   
   

   Terminals			Condition of rear window defogger switch	Voltage (V) (Approx.)
   (+)		(-)
   Rear window defogger connector	Terminal
   B604	1	Ground	ON	Battery voltage
   			OFF	0

   Fig 1: Checking Voltage Between Rear Window Defogger Connector And Ground

   

OK or NG 

OK: GO TO 2.

NG: GO TO  3.

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

   Rear window defogger connector	Terminal	Ground	Continuity
   B701	2		Yes

OK or NG 

OK: Check filament. Refer to "CHECK FILAMENT "

• If filament is OK, check condition of harness and connector.
• If filament is NG, repair filament.

NG: Repair or replace harness between rear window defogger and ground.

Fig 2: Checking Continuity Between Rear Window Defogger Connector And Ground

1. Turn ignition switch OFF.
2. Disconnect condenser and rear window defogger connector.
3. Check continuity between condenser and rear window defogger connector.
   CONTINUITY SPECIFICATION
   
   

   A		B		Continuity
   Condenser	Terminal	Rear window defogger connector	Terminal
   	1	B604	1	Yes

OK or NG 

OK: GO TO 4.

NG: Replace condenser.

Fig 3: Checking Continuity Between Condenser And Rear Window Defogger Connector

1. Remove rear window defogger relay.
2. Check continuity between rear window defogger relay connector and condenser connector.
   CONTINUITY SPECIFICATION
   
   

   A		B		Continuity
   Rear window defogger relay connector	Terminal	Condenser connector	Terminal
   E36	5	B49	1	Yes
   	7

   Fig 4: Checking Continuity Between Rear Window Defogger Relay Connector And Condenser Connector

   

OK or NG 

OK: Check the condition of harness and connector.

NG: Replace or repair harness between rear window defogger relay and condenser.