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 168 (POWER DOOR LOCKS - WITHOUT KEYLESS ENTRY)COMPONENT TESTSPOSITIVE TEMPERATURE COEFFICIENT (PTC) THERMISTOR OPERATION - DRIVER DOORTESTING USING AN AMMETER
2004 Toyota Matrix XR, FWD, Standard
Testing Using An Ammeter
2004 Toyota Matrix XR, FWD, StandardSECTION Testing Using An Ammeter
WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
- PTC thermistor is integral with power door lock motor of door lock assembly. Remove door panel from door for access to door lock assembly. See POWER DOOR LOCK ASSEMBLY (FRONT DOORS) under REMOVAL & INSTALLATION. Turn ignition off. Disconnect Black 6-pin electrical harness connector from door lock assembly.
- Using jumper wires, connect negative battery lead to door lock assembly terminal No. 2. Connect positive lead of ammeter to positive battery lead and connect negative lead of ammeter to door lock assembly terminal No. 1. See STEP 1 of Fig 1. Ensure current changes from about 3.2 amps to less than 0.5 amp within 20-70 seconds. If current changes as specified, go to next step. If current does not change as specified, replace door lock assembly. See POWER DOOR LOCK ASSEMBLY (FRONT DOORS) under REMOVAL & INSTALLATION.
- Disconnect test leads from door lock assembly terminals and wait at least 60 seconds. Connect positive battery lead to door lock assembly terminal No. 2 and connect negative battery lead to door lock assembly terminal No. 1. See STEP 2 of Fig 1. Ensure door lock moves to LOCK position. If operation is not as specified, replace door lock assembly. See POWER DOOR LOCK ASSEMBLY (FRONT DOORS) under REMOVAL & INSTALLATION.
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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.