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Home >> Toyota >> 2008 >> FJ Cruiser RWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter >> Meter / Gauge System >> Operating Light Control Rheostat does not Change Light Brightness >> Inspection Procedure

Inspection Procedure

  1. INSPECT FUSE (TAIL) 
    1. Remove the TAIL fuse from the main body ECU.
    2. Measure the resistance.

      Standard resistance: 

      Below 1 Ω 

    3. Reinstall the TAIL fuse.

    NG: REPLACE FUSE 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (FUSE (TAIL) - RHEOSTAT, RHEOSTAT - BODY GROUND) 
    1. Disconnect the E4 light control rheostat connector.
      2. Fig 1: Identifying Light Control Rheostat Connector Terminals
      G05580985Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance.

      Standard 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      E4-4 (T) - Body ground Tail light ON 11 to 14V
      E4-5 (E) - Body ground Always Below 1 Ω
    3. Reconnect the light control rheostat connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. INSPECT LIGHT CONTROL RHEOSTAT 
    1. Remove the light control rheostat but without disconnecting the connector.
      2. Fig 2: Light Control Rheostat Signal Waveform
      G05580986Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch ON.
    3. Using an oscilloscope, check the signal waveform of the light control rheostat.
      ITEM CONTENTS

      Item Contents
      Terminal connection E4-3 (-) - Body ground
      Tool setting 5 V / DIV, 50 ms / DIV
      Vehicle condition Ignition switch ON

      OK: 

      Waveform is as shown in the illustration. 

      HINT:

      Duty ratio changes as the illumination dims. (A becomes longer)

    4. Reinstall the light control rheostat.

    NG: REPLACE LIGHT CONTROL RHEOSTAT  (See REMOVAL  )

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - A@LIGHT CONTROL RHEOSTAT) 
    1. Disconnect the E13 combination meter assembly connector.
      2. Fig 3: Identifying Combination Meter And Light Control Rheostat Connector Terminals
      G05580987Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the E4 light control rheostat connector.
    3. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      E13-11 (ILL-) - E4-3 (-) Below 1 Ω
    4. Reconnect the combination meter assembly connector.
    5. Reconnect the light control rheostat connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE COMBINATION METER ASSEMBLY  (See REMOVAL  )

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