Rear Window Defogger Switch Circuit Check

With CONSULT-III 

Check ("REAR DEF SW", "IGN ON SW") in DATA MONITOR mode with CONSULT-III.

When rear window defogger switch is turned to ON 

REAR DEF SW : ON 

When ignition switch is turned to ON 

IGN ON SW : ON 

Without CONSULT-III 

1. Turn ignition switch ON.
2. Check voltage between BCM connector and ground.
   CONNECTOR TERMINAL VOLTAGE SPECIFICATION
   
   

   Connector	Terminals		Condition	Voltage (V) (Approx.)
   	(+)	(-)
   M18	10	Ground	Rear window defogger switch is pressed	0
   			Rear window defogger switch is released	5

OK or NG 

OK: Rear window defogger switch check is OK.

NG: GO TO 2.

Fig 1: Checking Voltage Between BCM Connector And Ground

1. Turn ignition switch OFF.
2. Disconnect BCM and front air control.
3. Check continuity between BCM connector M18 (A) terminal 10 and front air control connector M33 (B) terminal 38.

   10 - 38 : Continuity should exist. 

4. Check continuity between BCM connector M18 (A) terminal 10 and ground

   10 - Ground : Continuity should not exist. 

OK or NG 

OK: GO TO 3.

NG: Repair or replace harness.

Fig 2: Checking Continuity Between BCM Connector M18 Terminal 10 And Ground

Check continuity between front air control terminals.

OK or NG 

OK: GO TO 4.

NG: Replace front air control. Refer to "FRONT AIR CONTROL ".

Fig 3: Checking Continuity Between Front Air Control Terminals

Check continuity between front air control connector and ground.

OK or NG 

OK: GO TO 5.

NG: Repair or replace harness.

Fig 4: Checking Continuity Between Front Air Control Connector And Ground

1. Connect BCM.
2. Turn ignition switch ON.
3. Check voltage between BCM connector M18 terminal 10 and ground.

   10 - Ground : Approx. 5V 

OK or NG 

OK: Replace front air control. Refer to "FRONT AIR CONTROL ".

NG: Replace BCM. Refer to "REMOVAL AND INSTALLATION OF BCM ".

Fig 5: Checking Voltage Between BCM Connector M18 Terminal 10 And Ground