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 512 (ELECTRONICALLY CONTROLLED BRAKE SYSTEM - DIAGNOSIS)PROBLEM SYMPTOMS TABLE

2004 Toyota Matrix XR, FWD, Standard

Problem Symptoms Table

2004 Toyota Matrix XR, FWD, StandardSECTION Problem Symptoms Table

WARNING: This page is about a different car, the 2004 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

If there are no DTCs output but the problem still occurs, check the circuits for each problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.

PROBLEM SYMPTOMS TABLE - BRAKE SYSTEM

Symptoms	Suspect Areas
ABS does not operate BA does not operate EBD does not operate	Check the DTC again and make sure that the normal code is output. IG power source circuit and ground circuit. Speed sensor circuit Check the brake actuator with a hand-held tester. (Check brake actuator operation using the active test function.) If abnormal, check the hydraulic circuit for leakage. If the symptoms still occur even after the above circuits in suspect areas are inspected and proved to be normal, replace the skid control ECU.
ABS does not operate efficiently BA does not operate efficiently EBD does not operate efficiently	Check the DTC again and make sure that the normal code is output. Speed sensor circuit Stop lamp switch circuit Check the brake actuator with a hand-held tester. If abnormal, check the hydraulic circuit for leakage. If the symptoms still occur even after the above circuits in suspect areas are inspected and proved to be normal, replace the skid control ECU.
ABS warning light abnormal	ABS warning light circuit Skid control ECU
DTC of ABS check cannot be done	Check the DTC again and make sure that the normal code is output. TC terminal circuit If the symptoms still occur even after the above circuits in suspect areas are inspected and proved to be normal, replace the skid control ECU.
Sensor signal check cannot be done	TS terminal circuit Skid control ECU
VSC does not operate	Check the DTC again and make sure that the normal code is output. IG power source circuit and ground circuit. Check the hydraulic circuit for leakage. Speed sensor circuit Yaw rate/Deceleration sensor circuit Steering sensor circuit If the symptoms still occur even after the above circuits in suspect areas are inspected and proved to be normal, replace the skid control ECU.
SLIP indicator light abnormal	SLIP indicator light circuit Skid control ECU
DTC of VSC check cannot be done	Check the DTC again and make sure that the normal code is output. TC terminal circuit If the symptoms still occur even after the above circuits in suspect areas are inspected and proved to be normal, replace the skid control ECU.
VSC warning light abnormal	Check the DTC again and make sure that the normal code is output. VSC warning circuit If the symptoms still occur even after the above circuits in suspect areas are inspected and proved to be normal, replace the skid control ECU.
Brake Control warning light abnormal	Check the DTC again and make sure that the normal code is output. Brake Control warning circuit If the symptoms still occur even after the above circuits in suspect areas are inspected and proved to be normal, replace the skid control ECU.

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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.