Rear Window Defogger Switch Circuit Check

With CONSULT-II 

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

When rear window defogger switch is turned to ON 

REAR DEF SW: ON 

When ignition switch is turned to ON 

IGN ON SW: ON 

Fig 1: CONSULT-II Display - DATA MONITOR

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

Without CONSULT-II 

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

   Connector	Terminals		Condition	Voltage (V) (Approx.)
   	(+)	(-)
   M18	9	Ground	Rear window defogger switch is pressed.	0
   			Rear window defogger switch is OFF.	5

OK or NG 

• OK: Rear window defogger switch check is OK.
• NG: GO TO 2.
  Fig 2: Checking Voltage Between BCM Connector And Ground

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

1. Turn ignition switch OFF.
2. Disconnect BCM and front air control.
3. Check continuity between BCM connector M18 terminal 9 and front air control connector M49 terminal 11.

   9 - 11: Continuity should exist. 

4. Check continuity between BCM connector M18 terminal 9 and ground

   9 - Ground: Continuity should not exist. 

OK or NG 

• OK: GO TO 3.
• NG: Repair or replace harness.
  Fig 3: Checking Rear Window Defogger Switch Circuit Harness Continuity

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

1. Connect BCM.
2. Turn ignition switch ON.
3. Check voltage between BCM connector M18 terminal 9 and ground.

   9 - Ground: Approx. 5V 

OK or NG 

• OK: Replace front air control. Refer to "AIR CONDITIONER CONTROL ".
• NG: Replace BCM. Refer to "REMOVAL AND INSTALLATION OF BCM ".
  Fig 4: Checking Voltage Between BCM Connector M18 Terminal 9 And Ground

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