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.
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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 365 (AIR BAG RESTRAINT SYSTEMS)DIAGNOSTIC TESTSTEST 5A: DRIVER KNEE BLOCKER CIRCUIT OPEN
2004 Toyota Matrix XR, FWD, Standard
Test 5A: Driver Knee Blocker Circuit Open
2004 Toyota Matrix XR, FWD, StandardSECTION Test 5A: Driver Knee Blocker Circuit Open
WARNING: This page is about a different car, the 2004 Chrysler Pacifica. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Prior to performing any air bag system test, go to PRETEST INSPECTION & DIAGNOSTIC PROCEDURE
under DIAGNOSTICS. Perform TEST VER-1: AIR BAG VERIFICATION TEST
after all repairs unless otherwise directed.
- Turn ignition switch to ON position. Using DRBIII, determine if Occupant Restraint Controller (ORC) is generating active or stored Diagnostic Trouble Codes (DTCs). If ORC is generating active DTCs, go to next step. If ORC is generating a stored DTCs, go to TEST 1B: REPAIRING STORED CODES .
- Disable air bag system. See DISABLING SYSTEM under DISABLING & ACTIVATING AIR BAG SYSTEM. Access driver knee blocker and disconnect harness connector. See KNEE BLOCKER AIR BAG MODULE under REMOVAL & INSTALLATION. Connect appropriate SRS load tool to driver knee blocker harness connector. Turn ignition switch to ON position. Connect negative battery cable. On DRBIII, read active DTCs. If DRBIII displays DRIVER KNEE BLOCKER SQUIB 1 CIRCUIT OPEN, go to next step. If DRBIII does not display DRIVER KNEE BLOCKER SQUIB 1 CIRCUIT OPEN, replace driver knee blocker air bag module.
- Turn ignition switch to OFF position. Disconnect negative battery cable and wait at least 2 minutes. Access and disconnect appropriate Occupant Restraint Controller (ORC) connector (ORC connectors C1 and C2 are identical, except for terminal placement). See OCCUPANT RESTRAINT CONTROLLER (ORC) under REMOVAL & INSTALLATION. Connect appropriate SRS load tool adapter to harness side of ORC connector. Remove load tool from driver knee blocker harness connector. Measure resistance in driver knee blocker line 2 circuit (Dark Blue/Light Blue wire) between load tool adapter and driver knee blocker connector. See WIRING DIAGRAMS . Measure resistance in driver knee blocker line 1 circuit (Light Blue/Yellow wire) between load tool adapter and driver knee blocker connector. If resistance is less than one ohm in both circuits, replace ORC. If resistance is more than one ohm in either circuit, repair open or high resistance in appropriate wire.
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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.