Lock Control System

2004 Toyota Matrix XR, FWD, StandardSECTION Lock Control System
WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
PROBLEM SYMPTOMS

Symptom Suspect Area See Section
Passenger side door lock does not operate.
  1. Door lock motor circuit
  2. Passenger door ECU
  3. Theft deterrent ECU
  1. DOOR LOCK MOTOR CIRCUITΒ 
  2. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Door key related function does not operate.
  1. Door unlock detection switch circuit
  2. Door courtesy light and courtesy switch circuit
  3. Passenger door ECU
  4. Theft deterrent ECU
  1. DOOR UNLOCK DETECTION SWITCH CIRCUITΒ 
  2. DOOR COURTESY LIGHT AND COURTESY SWITCH CIRCUITΒ 
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
Key confinement prevention function does not operate.
  1. Door courtesy light and courtesy switch circuit
  2. Door unlock detection switch circuit
  3. Passenger door ECU
  4. Theft deterrent ECU
  1. DOOR COURTESY LIGHT AND COURTESY SWITCH CIRCUITΒ 
  2. DOOR UNLOCK DETECTION SWITCH CIRCUITΒ 
  3. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
  4. HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

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

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