2007 Lexus RX 400h FWDFACTORY OEM SERVICE PROCEDURE

Problem Symptoms Table

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.

NOTE: When replacing the skid control ECU, sensor, etc., turn the ignition switch off.

HINT:

Inspect the fuse and relay before investigating the suspected areas as shown in the table below.

Inspect each malfunctioning circuit in numerical order for the corresponding symptom.

ELECTRONICALLY CONTROLLED BRAKE SYSTEM 

PROBLEM SYMPTOMS CHART

Symptom Suspected Area See
ABS, BA and/or EBD does not operate 1. Use a chassis dynamometer, etc. to check the Electronically Controlled Brake operation -
2. Check the DTC again and make sure that the normal system code is output DTC CHECK / CLEAR 
3. IG power source circuit DTC C1241/41 LOW BATTERY POSITIVE VOLTAGE 
4. Front speed sensor circuit DTC C0200/31 FRONT SPEED SENSOR RH CIRCUIT 
5. Rear speed sensor circuit DTC C0210/33 REAR SPEED SENSOR RH CIRCUIT 
6. Check the brake actuator assembly with the intelligent tester (Check brake actuator assembly operation using the active test function) If abnormal, check the hydraulic circuit for leakage ON-VEHICLE INSPECTION 
7. If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to be normal, replace the skid control ECU SKID CONTROL ECU 
ABS, BA and/or EBD does not operate efficiently 1. Check that traction control has not operated by carrying out diagnosis (Traction control does not operate while the traction OFF switch is ON and the brake control warning light and SLIP indicator light are ON) -
2. Check the DTC again and make sure that the normal system code is output DTC CHECK / CLEAR 
3. Front speed sensor circuit DTC C0200/31 FRONT SPEED SENSOR RH CIRCUIT 
4. Rear speed sensor circuit DTC C0210/33 REAR SPEED SENSOR RH CIRCUIT 
5. Check the brake actuator assembly with the intelligent tester (Check brake actuator assembly operation using the active test function) If abnormal, check the hydraulic circuit for leakage ON-VEHICLE INSPECTION 
6. If the symptoms still occur even after the above circuits in suspected areas are inspected and proved to be normal, replace the skid control ECU SKID CONTROL ECU 
VSC and/or TRAC does not operate 1. Check the DTC again and make sure that the normal system code is output DTC CHECK / CLEAR 
2. IG power source circuit DTC C1241/41 LOW BATTERY POSITIVE VOLTAGE 
3. Check the hydraulic circuit for leakage -
4. Front speed sensor circuit DTC C0200/31 FRONT SPEED SENSOR RH CIRCUIT 
5. Rear speed sensor circuit DTC C0200/31 FRONT SPEED SENSOR RH CIRCUIT 
6. Yaw rate and deceleration sensor circuit DTC C1234/34 YAW RATE SENSOR MALFUNCTION 
7. Steering angle sensor circuit DTC C1231/31 STEERING ANGLE SENSOR CIRCUIT MALFUNCTION 
8. If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to be normal, replace the skid control ECU SKID CONTROL ECU 
Sensor signal check cannot be done 1. TS and CG terminal circuit TS AND CG TERMINAL CIRCUIT 
2. Skid control ECU SKID CONTROL ECU 
DTC check cannot be done 1. Check the DTC again and make sure that the normal system code is output DTC CHECK / CLEAR 
2. TC and CG terminal circuit TC AND CG TERMINAL CIRCUIT 
3. If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to be normal, replace the skid control ECU SKID CONTROL ECU 
ABS warning light abnormal (Remains on) 1. ABS warning light circuit ABS WARNING LIGHT REMAINS ON 
2. Skid control ECU SKID CONTROL ECU 
ABS warning light abnormal (Does not come on) 1. ABS warning light circuit ABS WARNING LIGHT DOES NOT COME ON 
2. Skid control ECU SKID CONTROL ECU 
Brake control warning light (Multi information display) abnormal (Remains on) 1. Brake control warning light circuit BRAKE CONTROL WARNING LIGHT REMAINS ON 
2. Skid control ECU SKID CONTROL ECU 
Brake control warning light (Multi information display) abnormal (Does not come on) 1. Brake control warning light circuit BRAKE CONTROL WARNING LIGHT DOES NOT COME ON 
2. Skid control ECU SKID CONTROL ECU 
BRAKE warning light abnormal (Remains on) 1. Brake fluid level warning light switch circuit DTC C1202/68 MASTER RESERVOIR LEVEL MALFUNCTION 
2. BRAKE warning light circuit BRAKE WARNING LIGHT REMAINS ON 
3. Skid control ECU SKID CONTROL ECU 
BRAKE warning light abnormal (Does not come on) 1. BRAKE warning light circuit BRAKE CONTROL WARNING LIGHT DOES NOT COME ON 
2. Skid control ECU SKID CONTROL ECU 
SLIP indicator light abnormal (Remains on) 1. SLIP indicator light circuit SLIP INDICATOR LIGHT REMAINS ON 
2. Skid control ECU SKID CONTROL ECU 
SLIP indicator light abnormal (Does not come on) 1. SLIP indicator light circuit SLIP INDICATOR LIGHT DOES NOT COME ON 
2. Skid control ECU SKID CONTROL ECU 
Skid control buzzer abnormal 1. Skid control buzzer circuit SKID CONTROL BUZZER CIRCUIT 
2. 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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