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.
2008 Lexus IS FFACTORY OEM SERVICE PROCEDURE
Problem Symptoms Table
If there are no DTCs output and the problem still occurs, check the circuits for each problem symptom in the order given in the following table and proceed to the relevant troubleshooting article
NOTE:
When replacing the skid control ECU, sensors, etc., turn the engine switch off.
HINT
- Use the table below to help determine the cause of problem symptoms If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below
Vehicle Stability Control System
PROBLEM SYMPTOMS TABLESymptom Suspected Area See ABS, BA and/or EBD does not operate Check for DTCs again and make sure that the normal system code is output DTC CHECK / CLEAR IG power source circuit DTC C1241/41 LOW BATTERY POSITIVE VOLTAGE Front speed sensor circuit DTC C0200/31 FRONT SPEED SENSOR RH CIRCUIT; DTC C0205/32 FRONT SPEED SENSOR LH CIRCUIT; DTC C1271/71 LOW OUTPUT SIGNAL OF FRONT SPEED SENSOR RH (TEST MODE DTC); DTC C1272/72 LOW OUTPUT SIGNAL OF FRONT SPEED SENSOR LH (TEST MODE DTC) Rear speed sensor circuit DTC C0210/33 REAR SPEED SENSOR RH CIRCUIT; DTC C0215/34 REAR SPEED SENSOR LH CIRCUIT; DTC C1273/73 LOW OUTPUT SIGNAL OF REAR SPEED SENSOR RH (TEST MODE DTC); DTC C1274/74 LOW OUTPUT SIGNAL OF REAR SPEED SENSOR LH (TEST MODE DTC) Check the brake actuator assembly using the Techstream (Check brake actuator assembly operation using the Active Test function) If abnormal, check the hydraulic circuit for leakage BRAKE ACTUATOR If the symptoms still occur even after the above circuits in suspected areas are inspected and prove to be normal, replace the skid control ECU SKID CONTROL ECU ABS, BA and/or EBD does not operate efficiently Check for DTCs again and make sure that the normal system code is output DTC CHECK / CLEAR Front speed sensor circuit DTC C0200/31 FRONT SPEED SENSOR RH CIRCUIT; DTC C0205/32 FRONT SPEED SENSOR LH CIRCUIT; DTC C1271/71 LOW OUTPUT SIGNAL OF FRONT SPEED SENSOR RH (TEST MODE DTC); DTC C1272/72 LOW OUTPUT SIGNAL OF FRONT SPEED SENSOR LH (TEST MODE DTC) Rear speed sensor circuit DTC C0210/33 REAR SPEED SENSOR RH CIRCUIT; DTC C0215/34 REAR SPEED SENSOR LH CIRCUIT; DTC C1273/73 LOW OUTPUT SIGNAL OF REAR SPEED SENSOR RH (TEST MODE DTC); DTC C1274/74 LOW OUTPUT SIGNAL OF REAR SPEED SENSOR LH (TEST MODE DTC) Stop light switch circuit DTC C1249/49 OPEN IN STOP LIGHT SWITCH CIRCUIT Check the brake actuator assembly using the Techstream (Check brake actuator assembly operation using the Active Test function) If abnormal, check the hydraulic circuit for leakage BRAKE ACTUATOR If the symptoms still occur even after the above circuits in suspected areas are inspected and prove to be normal, replace the skid control ECU SKID CONTROL ECU ABS sensor DTC check cannot be done Check for DTCs again and make sure that the normal system code is output DTC CHECK / CLEAR TC and CG terminal circuit TC AND CG TERMINAL CIRCUIT If the symptoms still occur even after the above circuits in suspected areas are inspected and prove to be normal, replace the skid control ECU SKID CONTROL ECU ABS warning light abnormal (Remains on) ABS warning light circuit ABS WARNING LIGHT REMAINS ON Skid control ECU SKID CONTROL ECU ABS warning light abnormal (Does not come on) ABS warning light circuit ABS WARNING LIGHT DOES NOT COME ON Skid control ECU SKID CONTROL ECU Brake warning light abnormal (Remains on) Brake warning light circuit BRAKE WARNING LIGHT REMAINS ON Skid control ECU SKID CONTROL ECU Brake warning light abnormal (Does not come on) Brake warning light circuit BRAKE WARNING LIGHT DOES NOT COME ON Skid control ECU SKID CONTROL ECU VSC and/or TRAC does not operate Check for DTCs again and make sure that the normal system code is output DTC CHECK / CLEAR IG power source circuit DTC C1241/41 LOW BATTERY POSITIVE VOLTAGE Check the hydraulic circuit for leakage - Front speed sensor circuit DTC C0200/31 FRONT SPEED SENSOR RH CIRCUIT; DTC C0205/32 FRONT SPEED SENSOR LH CIRCUIT; DTC C1271/71 LOW OUTPUT SIGNAL OF FRONT SPEED SENSOR RH (TEST MODE DTC); DTC C1272/72 LOW OUTPUT SIGNAL OF FRONT SPEED SENSOR LH (TEST MODE DTC) Rear speed sensor circuit DTC C0210/33 REAR SPEED SENSOR RH CIRCUIT; DTC C0215/34 REAR SPEED SENSOR LH CIRCUIT; DTC C1273/73 LOW OUTPUT SIGNAL OF REAR SPEED SENSOR RH (TEST MODE DTC); DTC C1274/74 LOW OUTPUT SIGNAL OF REAR SPEED SENSOR LH (TEST MODE DTC) Yaw rate and acceleration sensor circuit DTC C0371/71 YAW RATE SENSOR (TEST MODE DTC); DTC C1234/34 YAW RATE SENSOR MALFUNCTION; DTC C1243/43 ACCELERATION SENSOR STUCK MALFUNCTION; DTC C1244/44 OPEN OR SHORT IN ACCELERATION SENSOR CIRCUIT; DTC C1245/45 ACCELERATION SENSOR OUTPUT MALFUNCTION; DTC C1279/79 ACCELERATION SENSOR OUTPUT VOLTAGE MALFUNCTION (TEST MODE DTC); DTC C1381/97 ACCELERATION SENSOR POWER SUPPLY VOLTAGE MALFUNCTION Steering angle sensor circuit DTC C1231/31 STEERING ANGLE SENSOR CIRCUIT MALFUNCTION If the symptoms still occur even after the above circuits in suspected areas are inspected and prove to be normal, replace the skid control ECU SKID CONTROL ECU VSC sensor DTC check cannot be done Check for DTCs again and make sure that the normal system code is output DTC CHECK / CLEAR TC and CG terminal circuit TC AND CG TERMINAL CIRCUIT If the symptoms still occur even after the above circuits in suspected areas are inspected and prove to be normal, replace the skid control ECU SKID CONTROL ECU Master caution indicator light and/or multi-information display abnormal (Remains on) VSC warning light (Master caution indicator light and multi-information display) circuit VSC WARNING LIGHT REMAINS ON Skid control ECU SKID CONTROL ECU Master caution indicator light and/or multi-information display abnormal (Does not come on) VSC warning light (Master caution indicator light and multi-information display) circuit VSC WARNING LIGHT DOES NOT COME ON Skid control ECU SKID CONTROL ECU VSC OFF indicator light abnormal (Remains on) VSC OFF indicator light circuit VSC OFF INDICATOR LIGHT REMAINS ON Skid control ECU SKID CONTROL ECU VSC OFF indicator light abnormal (Does not come on) VSC OFF indicator light circuit VSC OFF INDICATOR LIGHT DOES NOT COME ON Skid control ECU SKID CONTROL ECU Slip indicator light abnormal (Remains on) Slip indicator light circuit SLIP INDICATOR LIGHT REMAINS ON Skid control ECU SKID CONTROL ECU Slip indicator light abnormal (Does not come on) Slip indicator light circuit SLIP INDICATOR LIGHT DOES NOT COME ON Skid control ECU SKID CONTROL ECU Sensor check cannot be done TS and CG terminal circuit TS AND CG TERMINAL CIRCUIT Skid control ECU SKID CONTROL ECU Skid control buzzer abnormal Skid control buzzer circuit SKID CONTROL BUZZER CIRCUIT Skid control ECU SKID CONTROL ECU
Factory Service Tools
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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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