Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Procedure
2004 Toyota Matrix XR, FWD, StandardSECTION Diagnostic Procedure
- Disable air bag system. See DISABLING SYSTEM under DISABLING & ACTIVATING AIR BAG SYSTEM. Access driver-side air bag module and disconnect spiral cable harness connectors from air bag module. See DUAL-STAGE DRIVER-SIDE AIR BAG MODULE under REMOVAL & INSTALLATION. Access air bag sensor assembly and disconnect harness connector A13. See AIR BAG SENSOR ASSEMBLY under REMOVAL & INSTALLATION. See Figure. Release short spring mechanism on air bag sensor assembly connector A13. See RELEASING SHORT SPRING under DIAGNOSTICS. Measure resistance between Yellow/Black wire and Yellow wire on spiral cable side of Orange upper spiral cable connector. See WIRING DIAGRAMS . If resistance is less than one megohm, go to step 4. If resistance is more than one megohm, go to next step.
- Connect air bag sensor assembly connector A13. Connect jumper wire between Yellow/Black wire and Yellow wire on spiral cable side of Orange upper spiral cable connector. Reconnect negative battery cable. Wait at least 2 seconds. Turn ignition switch to ON position. Wait at least 20 seconds. Clear DTCs. See CLEARING CODES under DIAGNOSTICS. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ON position. Wait at least 20 seconds. Retrieve codes. See RETRIEVING CODES under DIAGNOSTICS. If 13/B0100 is displayed, replace air bag sensor assembly. If DTC 13/B0100 is not displayed, go to next step.
- Turn ignition switch to LOCK position. Disconnect negative battery cable. Wait at least 90 seconds. Reconnect upper spiral cable connectors (to driver-side air bag module). Reconnect negative battery cable. Wait at least 2 seconds. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ON position. Wait at least 20 seconds. Clear DTCs. See CLEARING CODES under DIAGNOSTICS. Turn ignition switch to LOCK position. Wait at least 20 seconds. Turn ignition switch to ON position. Wait at least 20 seconds. Retrieve codes. See RETRIEVING CODES under DIAGNOSTICS. If DTC 13/B0100 is displayed, replace driver-side air bag module. If DTC 13/B0100 is not displayed, the system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT .
- Disconnect lower spiral cable connector. Release short spring on lower spiral cable harness connector. See RELEASING SHORT SPRING under DIAGNOSTICS. Measure resistance between Yellow/Black wire and Yellow wire on air bag sensor side of lower spiral cable connector. If resistance is less than one megohm, replace wiring harness between air bag sensor assembly and spiral cable. If resistance is more than one megohm, go to next step.
- Release short spring on spiral cable side of lower spiral cable connector. Measure resistance between Yellow/Black wire and Yellow wire on spiral cable side of Orange upper spiral cable connector. If resistance less than one megohm, replace spiral cable. See SPIRAL CABLE under REMOVAL & INSTALLATION. If resistance is more than one megohm, system is functioning properly at this time. Check for intermittent fault. See AIR BAG WARNING LIGHT INTERMITTENT .
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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.