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 184 (ENGINE IMMOBILIZER SYSTEMS)DIAGNOSTIC TESTSDTC B2795: UNMATCHED IGNITION KEY CODEDIAGNOSTIC PROCEDURE
2004 Toyota Matrix XR, FWD, Standard
Diagnostic Procedure
2004 Toyota Matrix XR, FWD, StandardSECTION Diagnostic Procedure
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.
- Clear DTCs from Engine Control Module (ECM). See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Insert all available ignition keys in ignition lock cylinder and check whether engine will start. Recheck for DTCs.
- If any ignition key does not start the engine and DTC B2795 is reset, go to next step. If all ignition keys start the engine, there is a possibility that the unregistered ignition key has been previously inserted into ignition lock cylinder and ECM is operating normally. Check with customer to verify ignition key usage.
- Once ignition key is found that does not start the engine and causes DTC B2795 to be reset, ignition key must be registered. See REGISTRATION OF ADDITIONAL MASTER KEY or REGISTRATION OF ADDITIONAL SUB-KEY under PROGRAMMING. After repairs have been made, perform confirmation test. See CONFIRMATION TEST under SYSTEM TESTS.
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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.