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Home >> Lexus >> 2007 >> GS 450h >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting >> Lighting System >> Light Control Switch Circuit >> Inspection Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Inspection Procedure

  1. READ VALUE OF INTELLIGENT TESTER (COMBINATION SWITCH) 
    1. Check the DATA LIST for proper functioning of the combination switch.

      Front light ECU 

      DATA LIST

      Item Measurement Item / Display (Range) Normal Condition
      F FOG LIGHT SW 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
      DIMMER HI SW 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 SW 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 SW 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 SW 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 SW 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 SW 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
      IG SW SIG Power switch signal / ON or OFF ON: Power switch ON (IG)
      OFF: Power switch OFF

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

    NG: GO TO Next Step 

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

      Standard resistance: Below 1 Ω 

    NG: REPLACE FUSE 

    OK: GO TO Next Step 

  3. CHECK WIRE HARNESS (COMBINATION SWITCH - BATTERY AND BODY GROUND) 
    1. Disconnect the K22 switch connector.
    2. Measure the voltage of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      K22-2 (IG) - K22-5 (E) Power switch ON (IG) 10 to 14 V
      K22-1 (B) - K22-5 (E) Always 10 to 14 V
    3. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      K22-5 (E) - Body ground Below 1 Ω
      Fig 1: Identifying K22 Combination Switch Connector Terminals
      G05315618Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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