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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 627 (COMBINATION METER - DIAGNOSTICS)OPERATING LIGHT CONTROL RHEOSTAT DOES NOT CHANGE LIGHT BRIGHTNESSINSPECTION PROCEDURE
2004 Toyota Matrix XR, FWD, Standard

Inspection Procedure

2004 Toyota Matrix XR, FWD, StandardSECTION Inspection Procedure
WARNING: This page is about a different car, the 2004 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK ILLUMINATION 
    1. Operate the rheostat and check that the quantity of light for the combination meter, audio system and A/C control panel etc. are normally changed.
    CHECK ILLUMINATION

    A All light do not change
    B Combination meter does not change
    1. B: CHECK AND REPLACE COMBINATION METER ASSY 
    2. A: Go to next step. 
  2. CHECK COMBINATION METER ASSY 
    1. Measure the voltage according to the value(s) in STANDARD  .

      Standard: 

      STANDARD

      Terminal No Condition Specified condition
      C7-38 - Body ground Ignition SW is ON Below 1 V - 10 to 14 V Pulse generation (*1)
      Fig 1: Identifying Combination Meter Connector Terminal C7-38
      G02895131Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    Inspection using oscilloscope (*1).

    INSPECTION USING OSCILLOSCOPE

    Item Contents
    Tool setting 2 V/DIV, 1 ms/DIV
    Vehicle condition Ignition switch ON

    HINT:

    Duty ratio changes as illumination becomes darker ("A" becomes longer).

    Fig 2: Waveform
    G02895132Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: CHECK AND REPLACE COMBINATION METER ASSY 
    2. OK: Go to next step. 
  3. INSPECT LIGHT CONTROL RHEOSTAT 
    1. Check continuity between terminals 1 (T) and 3 (E) of light control rheostat when light control rheostat operation as shown in chart below.
      Fig 3: Switch Position Continuity Table
      G02895133Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.