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Rear Window Defogger Switch Circuit Check

CHECK REAR WINDOW DEFOGGER SWITCH OPERATION

With CONSULT-II

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

Fig 1: CONSULT-II Display - REAR DEF SW, IGN ON SW

G03107403

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

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-II

Turn ignition switch ON.

Check voltage between BCM connector ground.

Fig 2: Checking Rear Window Defogger Switch Operation

G03107404

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

BCM VOLTAGE

Connector	Terminal (Wire color)		Condition	Voltage (V) (Approx.)
Connector	(+)	(-)	Condition	Voltage (V) (Approx.)
M3	9(L/W)	Ground	Rear window defogger switch is pressed.	0
M3	9(L/W)	Ground	Rear window defogger switch is OFF.	5

OK or NG

OK: Rear window defogger switch is OK.
NG: GO TO 2.

CHECK HARNESS CONTINUITY
1. Turn ignition switch OFF.
2. Disconnect BCM and A/C and AV switch connector.
3. Check continuity between BCM connector M3 terminal 9 and A/C and AV switch connector M64 terminal 16.
  
  Fig 3: Checking Rear Window Defogger Switch Harness Continuity
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  9 (L/W) - 16 (L/W): Continuity should exist.
  
  OK or NG
1. OK: GO TO 3.
2. NG: Repair or replace harness between BCM and A/C and AV switch.
CHECK BCM OUTPUT SIGNAL
1. Connect BCM connector.
2. Turn ignition switch ON.
3. Check voltage between BCM connector M3 terminal 9 and ground.
  
  Fig 4: Checking BCM Output Signal
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  9 (L/W) - Ground: Approx. 5
  
  OK or NG
1. OK: Replace A/C and AV switch.
2. NG: Replace BCM.