For Diagnostics

2004 Toyota Matrix XR, FWD, StandardSECTION For Diagnostics
WARNING: This page is about a different car, the 2003 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

Turn ignition switch to LOCK position. Disconnect and shield negative battery cable. Wait at least 90 seconds. Reconnect passenger-side air bag connector. Install driver-side air bag module. Reconnect right and left front air bag sensors. Reconnect right and left seat belt pretensioner connectors. Reconnect air bag sensor assembly connectors. Reconnect negative battery cable. Perform SYSTEM OPERATION CHECKΒ .

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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.