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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 626 (NAVIGATION SYSTEM - DIAGNOSTICS)REVERSE SIGNAL CIRCUITINSPECTION 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. INSPECT RADIO RECEIVER ASSY 
    1. Disconnect the radio receiver assy connector R12.
    2. Measure the resistance according to the value (s) in the table below.

      Standard: 

      TERMINALS RESISTANCE

      Tester connection Condition Specified condition
      REV - Body ground Ignition switch to ON. Shift lever is moved to R position. 10 to 14 V
      REV - Body ground Ignition switch to ON. Shift lever is moved to except R position. Below 1 V
      Fig 1: Disconnecting Radio Receiver Assy Connector R12
      G02895072Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: REPLACE RADIO RECEIVER ASSY 
    2. NG: Go to next step. 
  2. CHECK HARNESS AND CONNECTOR (RADIO AND NAVIGATION ASSY - PARK/NEUTRAL POSITION SWITCH ASSY) 
    1. Disconnect the connector from the radio and navigation assy R12 and park/neutral position switch assy A4.
    2. Measure the resistance according to the value (s) in the table below.

      Standard: 

      TERMINALS RESISTANCE

      Tester connection Condition Specified condition
      REV - A4-1 Always Below 1 Ω
      REV - Body ground Always 10 k Ω or higher
      Fig 2: Disconnecting Connector From Radio And Navigation Assy R12
      G02895073Courtesy 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.