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Light Control Switch Circuit: Procedure

  1. READ VALUE USING TECHSTREAM 
    1. Connect Techstream to the DLC3.
    2. Turn the ignition switch on (IG).
    3. Turn Techstream on.
    4. Select the following menu items: Body Electrical / Main Body / Data List.
    5. Read the display on Techstream.
      MAIN BODY:

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Dimmer Hi SW Dimmer switch HIGH signal / ON or OFF ON: Dimmer switch in HIGH or HIGH FLASH
      OFF: Dimmer switch in LOW      		 -
      Passing Light SW Dimmer switch HIGH FLASH signal / ON or OFF ON: Dimmer switch in HIGH FLASH
      OFF: Dimmer switch not in HIGH FLASH      		 -
      Front Fog Light SW Front fog light switch signal / ON or OFF ON: Fog light switch ON
      OFF: Fog light switch OFF      		 -
      Light Auto SW Light control switch AUTO signal / ON or OFF ON: Light control switch in AUTO
      OFF: Light control switch not in AUTO      		 -
      Headlight SW Light control switch HEAD signal / ON or OFF ON: Light control switch in HEAD
      OFF: Light control switch not in HEAD      		 -
      Taillight SW Light control switch TAIL signal / ON or OFF ON: Light control switch in TAIL or HEAD
      OFF: Light control switch in neither TAIL nor HEAD      		 -

      OK

      Normal conditions listed above are displayed.

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

    NG: Go to next step 

  2. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY 
    1. Inspect the headlight dimmer switch assembly. Refer to INSPECTION - Step 1 .

      OK

      Headlight dimmer switch assembly is normal.

    NG → REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B ASSEMBLY - SWITCH ASSEMBLY) 
    1. Disconnect the E21 headlight dimmer switch assembly connector.
      Fig 1: Checking Harness And Connector (Instrument Panel J/B Assembly - Switch Assembly)
      GTY206505Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the E6 and E7 main body ECU connectors.
    3. Disconnect the IG instrument panel J/B connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      E21-3 (LFG) - E21-16 (HL) Always Below 1 Ω
      E21-4 (BFG) - E6-28 (FFOG) Always Below 1 Ω
      E21-11 (HU) - IG-5 (HU) Always Below 1 Ω
      E21-17 (HF) - E7-13 (HF) Always Below 1 Ω
      E21-18 (T) - E7-23 (TAIL) Always Below 1 Ω
      E21-19 (A) - E7-21 (A) Always Below 1 Ω
      E21-20 (H) - E6-17 (HEAD) Always Below 1 Ω
      E21-3 (LFG) - Body ground Always 10 kΩ or higher
      E21-4 (BFG) - Body ground Always 10 kΩ or higher
      E21-11 (HU) - Body ground Always 10 kΩ or higher
      E21-17 (HF) - Body ground Always 10 kΩ or higher
      E21-18 (T) - Body ground Always 10 kΩ or higher
      E21-19 (A) - Body ground Always 10 kΩ or higher
      E21-20 (H) - Body ground Always 10 kΩ or higher
      E21-12 (EL) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

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