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.
2007 Lexus LX 470FACTORY OEM SERVICE PROCEDURE
Problem Symptoms Table
HINT:
- Use the table below to help determine the cause of the problem symptom. 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
| Symptom | Suspected area | See |
|---|---|---|
| BS does not operate, BA does not operate | Only when 1. to 4. are all normal and the problem is still occurring, replace the skid control ECU | - |
| 1. Reconfirm the DTC and check that the normal code is output | DTC CHECK / CLEAR | |
| 2. IG power source circuit | DTC C1241/41 Low Battery Positive Voltage or Abnormally High Battery Positive Voltage | |
| 3. Speed sensor circuit | DTC C0200/31 Right Front Wheel Speed Sensor Signal Malfunction; DTC C0205/32 Left Front Wheel Speed Sensor Signal Malfunction; DTC C0210/33 Right Rear Wheel Speed Sensor Signal Malfunction; DTC C0215/34 Left Rear Wheel Speed Sensor Signal Malfunction; DTC C1235/35 Foreign Object is Attached on Tip of Front Speed Sensor RH; DTC C1236/36 Foreign Object is Attached on Tip of Front Speed Sensor LH; DTC C1238/38 Foreign Object is Attached on Tip of Rear Speed Sensor RH; DTC C1239/39 Foreign Object is Attached on Tip of Rear Speed Sensor LH | |
| 4. Check the hydraulic brake booster with a checker or intelligent tester | HYDRAULIC BRAKE BOOSTER | |
| If abnormal, check the hydraulic circuit for leakage | REMOVAL | |
| ABS does not operate efficiently, BA does not operate | Only when 1. to 4. are all normal and the problem is still occurring, replace the skid control ECU | - |
| 1. Reconfirm the DTC and check that the normal code is output | DTC CHECK / CLEAR | |
| 2. Speed sensor circuit | DTC C0200/31 Right Front Wheel Speed Sensor Signal Malfunction; DTC C0205/32 Left Front Wheel Speed Sensor Signal Malfunction; DTC C0210/33 Right Rear Wheel Speed Sensor Signal Malfunction; DTC C0215/34 | |
| 3. Stop light switch circuit | DTC C1249/49 Open in Stop Light Switch Circuit | |
| 4. Check the hydraulic brake booster with a checker or intelligent tester | HYDRAULIC BRAKE BOOSTER | |
| If abnormal, check the hydraulic circuit for leakage | REMOVAL | |
| ABS warning light abnormal | 1. ABS warning light circuit | ABS WARNING LIGHT CIRCUIT |
| 2. Skid control ECU | REMOVAL | |
| DTC check cannot be done | Only when 1. to 4. are all normal and the problem is still occurring, replace the skid control ECU | - |
| 1. ABS warning light circuit | ABS WARNING LIGHT CIRCUIT | |
| 2. VSC OFF indicator light, center diff. lock indicator switch circuit | VSC TRAC Warning Light Circuit | |
| 3. Center diff. lock indicator switch circuit | DTC C1340/47 Center Differential Lock Circuit | |
| 4. TC and CG terminal circuit | TC AND CG TERMINAL CIRCUIT | |
| Speed sensor signal check cannot be done | 1. TS and CG terminal circuit | TS AND CG TERMINAL CIRCUIT |
| 2. Skid control ECU | REMOVAL | |
| TRAC does not operate | Only when 1. to 4. are all normal and the problem is still occurring, replace the skid control ECU | - |
| 1. Check the DTC, reconfirming that the normal code is output | DTC CHECK / CLEAR | |
| 2. IG power source circuit | DTC C1241/41 Low Battery Positive Voltage or Abnormally High Battery Positive Voltage | |
| 3. Check the hydraulic circuit for leakage | REMOVAL | |
| 4. Speed sensor circuit | DTC C0200/31 Right Front Wheel Speed Sensor Signal Malfunction; DTC C0205/32 Left Front Wheel Speed Sensor Signal Malfunction; DTC C0210/33 Right Rear Wheel Speed Sensor Signal Malfunction; DTC C0215/34 | |
| VSC does not operate | Only when 1. to 7. are all normal and the problem is still occurring, replace the skid control ECU | - |
| 1. Check the DTC, reconfirming that the normal code is output | DTC CHECK / CLEAR | |
| 2. IG power source circuit | DTC C1241/41 Low Battery Positive Voltage or Abnormally High Battery Positive Voltage | |
| 3. Check the hydraulic circuit for leakage | REMOVAL | |
| 4. Speed sensor circuit | DTC C0200/31 Right Front Wheel Speed Sensor Signal Malfunction; DTC C0205/32 Left Front Wheel Speed Sensor Signal Malfunction; DTC C0210/33 Right Rear Wheel Speed Sensor Signal Malfunction; DTC C0215/34 | |
| 5. Deceleration sensor circuit | DTC C1246/46 Master Cylinder Pressure Sensor Malfunction | |
| 6. Yaw rate sensor circuit | DTC C1233/33 Open or Short Circuit in Yaw Rate Sensor Circuit; DTC C1234/34 Yaw Rate Sensor Malfunction | |
| 7. Steering angle sensor circuit | DTC C1231/31 Steering Angle Sensor Circuit Malfunction; DTC C1335/35 Steering Angle Sensor Circuit | |
| VSC TRAC warning light abnormal | 1. VSC TRAC warning light circuit | VSC TRAC Warning Light Circuit |
| 2. Skid control ECU | REMOVAL | |
| BRAKE warning light abnormal | 1. BRAKE warning light circuit | BRAKE WARNING LIGHT CIRCUIT |
| 2. Skid control ECU | REMOVAL | |
| SLIP indicator light abnormal | 1. SLIP indicator light circuit | SLIP INDICATOR LIGHT CIRCUIT |
| 2. Skid control ECU | REMOVAL | |
| VSC OFF indicator abnormal | 1. VSC OFF indicator light, center diff. lock switch circuit | VSC OFF Indicator Light Circuit |
| 2. Skid control ECU | REMOVAL | |
| TRAC indicator light abnormal | 1. TRAC indicator light circuit | TRAC INDICATOR LIGHT CIRCUIT |
| 2. Skid control ECU | REMOVAL |
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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