Rear Window Defogger Switch Circuit Check

With CONSULT-II 

Check rear window switch "REAR DEF SW"  in "DATA MONITOR" mode with CONSULT-II.

1. When rear window defogger switch ON 
2. REAR DEF SW: ON 

Fig 1: Rear Window Defogger (Multifunction) Switch Inspection With CONSULT-II

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

With out CONSULT-II 

1. Turn ignition switch ON.
2. Check voltage between BCM connector M4 terminal 10(G/R) and ground.
   Fig 2: Inspecting Rear Window Defogger (Multifunction) Switch Without CONSULT-II

   Courtesy of NISSAN MOTOR CO., U.S.A.
   Fig 3: Identifying Voltage Specifications

   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.

1. Disconnect BCM connector and multifunction switch (rear window defogger with) connector.
2. Check continuity between BCM connector M4 terminal 10(G/R) and multifunction switch (rear defogger switch) connector M83 terminal 5(G/R).
   1. 10 (G/R) - 5(G/R): Continuity should exist. 
   Fig 4: Checking Rear Window Defogger Switch Signal Circuit

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check continuity between BCM harness connector M4 terminal 10(G/R) and ground
   1. 10 (G/R) - ground: Continuity should not exist. 

OK or NG 

1. OK: GO TO 3.
2. NG: Repair or replace harness between BCM and multifunction switch (rear window defogger switch).

Check continuity between multifunction (rear window defogger) switch connector M83 terminal 2 (B) and ground.

1. 2(B) - ground: Continuity should exist. 

Fig 5: Checking Continuity Between Multifunction (Rear Window Defogger) Switch & Ground

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

OK or NG 

1. OK: Replace multifunction switch.
2. NG: Repair or replace harness between multifunction (rear window defogger) switch and ground.