For Diagnostics

2004 Toyota Matrix XR, FWD, StandardSECTION For Diagnostics
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. Turn ignition switch to LOCK position. Disconnect and shield negative battery cable. Wait at least 90 seconds. Remove driver-side air bag module. See DRIVER-SIDE AIR BAG MODULE  under REMOVAL & INSTALLATION. Disconnect passenger-side air bag module connector, accessible by removing glove box door finish plate. See Fig 1.
  2. Disconnect air bag sensor assembly connectors. See AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. Disconnect right and left seat belt pretensioner connectors. See SEAT BELT PRETENSIONER  under REMOVAL & INSTALLATION. Disconnect right-side and left-side air bag module connectors. See SIDE AIR BAG MODULE  under REMOVAL & INSTALLATION.
  3. Disconnect right and left-side air bag sensor connectors. See HEAD IMPACT/SIDE AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION. Disconnect right and left front air bag sensor connectors. See FRONT AIR BAG SENSOR  under REMOVAL & INSTALLATION. Disconnect right and left head impact/side air bag sensor connectors. See HEAD IMPACT/SIDE AIR BAG SENSOR ASSEMBLY  under REMOVAL & INSTALLATION.
Fig 1: Disconnecting Passenger-side Air Bag Module
G98D13808Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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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.