Rear Window Defogger Switch Circuit Check

WARNING: This page is about a different car, the 2005 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK REAR WINDOW DEFOGGER SWITCH OPERATION
With CONSULT-II

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

When rear defogger switch is turned to ON

REAR DEF SW: ON

When ignition switch is turned to ON

IGN ON SW: ON

Fig 1: "REAR DEF SW" Display
Courtesy of NISSAN MOTOR CO., U.S.A.

With out CONSULT-II
1. Turn ignition switch ON.
2. Check voltage between BCM connector ground.
  
  Fig 2: BCM Connector Ground Terminals Voltage Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Checking Voltage Between BCM Connector Terminal 9 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: Rear window defogger switch check is OK.
2. NG: GO TO 2.
CHECK REAR WINDOW DEFOGGER SWITCH CIRCUIT HARNESS CONTINUITY
1. Turn ignition switch OFF.
2. Disconnect BCM and A/C and audio controller connector.
3. Check continuity between BCM connector M1 terminal 9 and A/C and audio controller connector M38 terminal 12.
  9 (L/R) - 12(L/R): Continuity should exist
OK or NG
1. OK: GO TO 3.
2. NG: Repair or replace harness.
Fig 4: Checking Continuity Between BCM Connector M1 Terminal 9 & A/C & Audio Controller Connector M38 Terminal 12
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK BCM OUTPUT SIGNAL
1. Connect BCM connector.
2. Turn ignition switch ON.
3. Check voltage between BCM connector M1 terminal 9 and ground.
  9 (L/R) - Ground: Approx. 5V
OK or NG
1. OK: Replace A/C and audio controller.
2. NG: Replace BCM.
Fig 5: Checking Voltage Between BCM Connector M1 Terminal 9 & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.