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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 176 (REAR WINDOW DEFOGGER & HEATED MIRRORS)TROUBLE SHOOTING
2004 Toyota Matrix XR, FWD, Standard

Trouble Shooting

2004 Toyota Matrix XR, FWD, StandardSECTION Trouble Shooting
WARNING: This page is about a different car, the 2003 Lexus GS 430, 2003 Lexus GS 300, 2002 Lexus GS 430, and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Trouble shooting of a rear window defogger and heated mirror system complaint begins with verification of the customer problem. If problem occurs, go to step  3. If problem does not occur, go to next step.
  2. If problem does not occur, review conditions under which problem occurred for customer and try to duplicate those conditions. For example, if the problem occurs on rainy days or during high humidity conditions, sprinkle water onto vehicle and see if malfunction occurs. DO NOT sprinkle water directly into engine compartment or onto electronic components. Visually inspect for signs of mechanical and electrical damage. Inspect for blown fuses and damaged relays. Inspect for loose or corroded connections, damaged wiring harnesses and/or switches. Check for a broken or partially broken wire inside insulation, which could cause system malfunction but prove good in a continuity/voltage check with system disconnected. Ensure any aftermarket electronic equipment is properly installed. If fault is found, repair as necessary.
  3. Inspect the multiplex communication system and confirm that there is no trouble by the basic inspection and DTC check. See PRE-CHECK under SELF-DIAGNOSTIC in MULTIPLEX COMMUNICATION SYSTEM article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.
  4. Determine problem symptom. See PROBLEM SYMPTOM INDEX  table.
    PROBLEM SYMPTOM INDEX

    Symptom Suspected Area (1)
    Rear Window Defogger Does Not Operate (2)(3)(4)(5)(6)(7)(8)
    Mirror Defogger Does Not Operate (9)(10)(11)(7)
    (1) Perform test procedures in order listed under suspected area.
    (2) Check the HTR (10-amp) fuse located in the driver side junction block.
    (3) Check the DEFOG (30-amp) fuse located in the passenger side junction block.
    (4) Check the defogger relay circuit. See BODY CONTROL SYSTEMS article.
    (5) Check the defogger switch in the A/C panel switch. See DEFOGGER SWITCH CIRCUIT  under CIRCUIT TESTS.
    (6) Check the defogger wire. See DEFOGGER WIRE  under COMPONENT TESTS.
    (7) Check the wire harness. See DEFOGGERS in SYSTEM WIRING DIAGRAMS article.
    (8) Check the body ECU No. 1. See BODY CONTROL SYSTEMS article.
    (9) Check the MIR-HTR (10-amp) fuse in the passenger side junction block.
    (10) Check the mirror heater relay. See DEFOGGER RELAY  under COMPONENT TESTS.
    (11) Check the mirror heater. See MIRROR DEFOGGER  under COMPONENT TESTS.
  5. After repairs have been completed, confirm that problem has been eliminated. Operate the system under same conditions recorded for original complaint. If problem is no longer present, repair has corrected problem. If problem is still present, further diagnosis and repair is required.
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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.