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Light Control Switch Circuit: Procedure

  1. READ VALUE USING TECHSTREAM 
    1. Check the DATA LIST for proper functioning of the combination switch.
      COMBINATION SWITCH (WINDSHIELD WIPER SWITCH ASSEMBLY)

      Item Measurement Item / Display (Range) Normal Condition Diagnostic Note
      Front Fog Light Switch Front fog light switch signal / ON or OFF ON: Front fog light switch is in ON position
      OFF: Front fog light switch is not in ON position      		 -
      Passing Light Switch Passing light switch signal / ON or OFF ON: Headlight dimmer switch is in HIGH FLASH position
      OFF: Headlight dimmer switch is not in HIGH FLASH position      		 -
      Dimmer Hi Switch High beam switch signal / ON or OFF ON: Headlight dimmer switch is in HI position
      OFF: Headlight dimmer switch is not in HI position      		 -
      Light Auto Switch Auto light switch signal / ON or OFF ON: Light control switch is in AUTO position
      OFF: Light control switch is not in AUTO position      		 -
      Head Light Switch Headlight control switch signal / ON or OFF ON: Light control switch is in HEAD position
      OFF: Light control switch is not in HEAD position      		 -
      Tail Light Switch Taillight switch signal / ON or OFF ON: Light control switch is in TAIL or HEAD position
      OFF: Light control switch is not in OFF position      		 -
      Turn Left Switch Turn signal switch LH signal / ON or OFF ON: Light control switch is in LH position
      OFF: Light control switch is not in LH position      		 -
      Turn Right Switch Turn signal switch RH signal / ON or OFF ON: Light control switch is in RH position
      OFF: Light control switch is not in RH position      		 -
      Ignition Switch Signal Engine switch signal / ON or OFF ON: Engine switch on (IG)
      OFF: Engine switch off      		 -

    NG → See step   2 

    OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

  2. INSPECT FUSE (ECU-IG RH, MPX-B, D/C CUT) 
    1. Remove the ECU-IG RH fuse from the cowl side junction block RH.
    2. Remove the MPX-B fuse from the engine room No. 1 relay block.
    3. Remove the D/C CUT fuse from the engine room No. 1 relay block.
    4. Measure the resistance of the fuses.

      Standard resistance

      Below 1 Ω

    NG → REPLACE FUSE 

    OK: Go to next step 

  3. CHECK WIRE HARNESS (BATTERY - COMBINATION SWITCH - BODY GROUND) 
    1. Disconnect the K22 switch connector.
      Fig 1: Identifying K22 Switch Connector
      GTY102757Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance of the wire harness side connector.

      Standard voltage

      Tester Connection Condition Specified Condition
      K22-2 (IG) - K22-5 (E) Engine switch on (IG) 10 to 14 V
      K22-1 (B) - K22-5 (E) Always 10 to 14 V

      Standard resistance

      Tester Connection Specified Condition
      K22-5 (E) - Body ground Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

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