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Inspection Procedure

  1. SYSTEM CHECK 
    1. Turn the light control switch to the TAIL or HEAD position.

      Check if other displays or indicators such as the A/C switch indicator come on.

      OK: Other displays or indicators come on. 

    NG:  GO TO LIGHTING SYSTEM

    OK : Go to next step. 

  2. CHECK HARNESS AND CONNECTOR (RH R/B - RADIO RECEIVER) 
    Fig 1: Checking Harness And Connector (RH R/B - Radio Receiver)
    G05237103Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the radio receiver R16 connector.
    2. Measure the voltage according to the values in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester connection Condition Specified condition
      ILL+ (R16-2) - Body ground (1) Light control switch TAIL 10 to 14 V
      ILL+ (R16-10) - Body ground (2) Light control switch TAIL 10 to 14 V
      (1) Separate Type Amplifier
      (2) Built-in Type Amplifier

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK : Go to next step. 

  3. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - LIGHT CONTROL RHEOSTAT) 
    Fig 2: Checking Harness And Connector (Radio Receiver - Light Control Rheostat)
    G05237104Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the radio receiver R16 or R17 connector and light control rheostat R8 connector.
    2. Measure the resistance according to the values in the table below. Standard:

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester connection Specified condition
      ILL- (R16-12) - ILL+ (R8-2) (1) Below 1 Ω
      ILL- (R16-12) - Body ground (1) 10 kΩ or higher
      ILL- (R17-5) - ILL+ (R8-2) (2) Below 1 Ω
      ILL- (R17-5) - Body ground (2) 10 kΩ or higher
      (1) Separate Type Amplifier
      (2) Built-in Type Amplifier

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK : Go to next step. 

  4. INSPECT LIGHT CONTROL RHEOSTAT 
    Fig 3: Inspecting Light Control Rheostat
    G05237105Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Reconnect the light control rheostat R8 connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester connection Condition Specified condition
      ILL+(R8-2) - Body ground Light control switch OFF → TAIL (Light intensity is max.) Below 1 V → 10 to 14 V

    NG: REPLACE LIGHT CONTROL RHEOSTAT 

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

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