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.
2004 Lexus IS 300 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
System Testing: Notes
SYSTEM INDEX
| Symptom | Perform Test |
|---|---|
| ABS Sensor Signal Check | TEST A |
| DTC Always On, Malfunction In ECU ABS Warning Light Circuit | TEST B |
| DTC Always On, Malfunction In ECU VSC Warning Light Circuit | TEST C |
| ABS Warning Light Circuit | TEST D |
| Brake Actuator Assembly | TEST E |
| Brake Warning Light Circuit | TEST F |
| SLIP Indicator Light Circuit | TEST G |
| Speed Sensor Signal Check | TEST H |
| Ts Terminal Circuit | TEST I |
| TRAC OFF Indicator, TRAC Cut Switch Circuit | TEST J |
| VSC Sensor Check | TEST K |
| VSC Warning Buzzer Circuit | TEST L |
| VSC Warning Light Circuit | TEST M |
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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