Check Rear Window Defogger Power Supply Circuit

• Check 10A fuse [No.12, located in the fuse block (J/B)]
• Check 20A fuse (No.75, located in the IPDM E/R)
• Check 20A fuse (No.80, located in the IPDM E/R)
  NOTE: Refer to "COMPONENT PARTS AND HARNESS CONNECTOR LOCATION ".

OK or NG 

OK: GO TO 2.

NG: If fuse is blown out, be sure to eliminate cause of malfunction before installing new fuse, refer to "POWER SUPPLY ROUTING CIRCUIT ".

1. Turn ignition switch OFF.
2. Remove rear window defogger relay.
3. Turn ignition switch ON.
4. Check voltage between rear window defogger relay connector and ground.
   VOLTAGE SPECIFICATION
   
   

   Terminals			Voltage (V) (Approx.)
   (+)		(-)
   Rear window defogger relay connector	Terminal
   E36	1	Ground	Battery voltage
   	3
   	6

OK or NG 

OK: GO TO 3.

NG: Repair or replace harness between fuse block (J/B) and rear window defogger relay.

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

Check rear window defogger relay.

Fig 2: Checking Continuity Between Rear Window Defogger Relay Terminals 3 And 5, 6 And 7

OK or NG 

OK: GO TO 4.

NG: Replace rear window defogger relay.

1. Turn ignition switch OFF.
2. Install rear window defogger relay.
3. Turn ignition switch ON.
4. Check voltage between IPDM E/R connector and ground.
   VOLTAGE SPECIFICATION
   
   

   Terminals			Condition of rear window defogger switch	Voltage (V) (Approx.)
   (+)		(-)
   IPDM E/R connector	Terminal
   E9	57	Ground	ON (pressed)	0
   			OFF	Battery voltage

   Fig 3: Checking Voltage Between IPDM E/R Connector And Ground

   

OK or NG 

OK: Rear window defogger power supply circuit is OK.

NG: GO TO 5.

1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector and rear window defogger relay.
3. Check continuity between IPDM E/R connector and rear window defogger relay connector.
   CONTINUITY SPECIFICATION
   
   

   A		B		Continuity
   IPDM E/R connector	Terminal	Rear window defogger relay connector	Terminal
   E9	57	E36	2	Yes

OK or NG 

OK: GO TO 6.

NG: Repair or replace harness.

Fig 4: Checking Continuity Between IPDM E/R Connector And Rear Window Defogger Relay Connector

1. Connect IPDM E/R connector and rear window defogger relay.
2. Turn ignition switch ON.
3. Check voltage between IPDM E/R connector and ground.
   VOLTAGE SPECIFICATION
   
   

   Terminals			Voltage (V) (Approx.)
   (+)		(-)
   IPDM E/R connector	Terminal
   E9	57	Ground	Battery voltage

   Fig 5: Checking Voltage Between IPDM E/R Connector And Ground

   

OK or NG 

OK: Check condition of harness and connector.

NG: Replace IPDM E/R.