Rear Window Defogger Switch Circuit Check.

With CONSULT-II 

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

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

Fig 1: Checking Rear Window Defogger (Multi-Function) Switch With CONSULT-II

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With out CONSULT-II 

1. Turn ignition switch ON.
2. Check voltage between BCM connector and ground.
   Fig 2: BCM Connector Terminal And Ground Voltage Specifications

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OK or NG 

1. OK >> Rear window defogger switch is OK.
2. NG >> GO TO 2

Fig 3: Checking Rear Window Defogger (Multi-Function) Switch Without CONSULT-II

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1. Turn ignition switch OFF.
2. Disconnect BCM and multifunction switch (rear window defogger with) connectors.
3. Check continuity between BCM connector M4 terminal 10 and multifunction switch (rear defogger switch) connector M83 terminal 5.
   1. 10 (G/R) - 5(G/R) :Continuity should exist 
   Fig 4: Checking Continuity Between BCM Connector M4 Terminal 10 And Multifunction Switch (Rear Defogger Switch) Connector M83 Terminal 5

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4. Check continuity between BCM harness connector M4 terminal 10 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 multi-function switch (rear window defogger switch) connector M83 terminal 2 and ground.

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

Fig 5: Checking Continuity Between Multi-Function Switch (Rear Window Defogger Switch) Connector M83 Terminal 2 And Ground

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OK or NG 

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