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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 172 (REMOTE KEYLESS ENTRY SYSTEMS)TROUBLE SHOOTINGNOTES
2004 Toyota Matrix XR, FWD, Standard

Trouble Shooting: Notes

2004 Toyota Matrix XR, FWD, StandardSECTION Notes
WARNING: This page is about a different car, the 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 remote keyless entry 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. Inspect the door lock control system to make sure that it is operating normally. See POWER DOOR LOCKS, TRUNK LID & FUEL DOOR RELEASE article under DOOR LOCKS & ANTI-THEFT SYSTEMS in ACCESSORIES & EQUIPMENT.
  5. Determine problem symptom. See PROBLEM SYMPTOM INDEX  table.
    PROBLEM SYMPTOM INDEX

    Symptom Suspected Area (1)
    All Functions Of Wireless Door Lock Control System Do Not Operate (2)(3)(4)(5)
    Wireless Door Lock Operates, But Buzzer Does Not Sound (Buzzer Does Not Sound When Customize Function Prohibits) (6)(3)(4)
    (1) Perform test procedures in order listed under suspected area.
    (2) Check the transmitter. See WIRELESS DOOR LOCK TRANSMITTER  under COMPONENT TESTS.
    (3) Check the wireless door lock control receiver. See WIRELESS DOOR LOCK CONTROL RECEIVER CIRCUIT  under CIRCUIT TESTS.
    (4) Check the wire harness. See WIRING DIAGRAMS .
    (5) Check the body ECU No. 1. See BODY CONTROL SYSTEMS article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.
    (6) Check the wireless door lock buzzer. See WIRELESS DOOR LOCK BUZZER  under COMPONENT TESTS.
  6. 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.