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 SC 430FACTORY OEM SERVICE PROCEDURE
Problem Symptoms Table
WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
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.
Retractable hardtop system
PROBLEM SYMPTOMS CHARTSymptom Suspected area See Roof cannot be opened or closed (Roof lock is not released) 1. Roof lock motor circuit DTC B2511 OPEN IN ROOF LOCK MOTOR CIRCUIT 2. Roof lock PACKAGE TRAY DRIVE MOTOR Roof cannot be opened or closed (Roof lock is released) 1. Roof drive motor circuit DTC B2502 OPEN IN ROOF DRIVE MOTOR RH CIRCUIT 1. Roof drive motor circuit DTC B2504 OPEN IN ROOF DRIVE MOTOR LH CIRCUIT 2. Roof link REMOVAL Roof cannot be opened (Front door window cannot be lowered) 1. Power window motor circuit ON-VEHICLE INSPECTION 2. Power window regulator POWER WINDOW REGULATOR MOTOR 3. Door ECU TERMINALS OF ECU Roof stops halfway 1. Roof motor circuit DTC B2502 OPEN IN ROOF DRIVE MOTOR RH CIRCUIT 1. Roof motor circuit DTC B2504 OPEN IN ROOF DRIVE MOTOR LH CIRCUIT 2. Roof link REMOVAL 3. Package tray motor circuit DTC B2518 OPEN IN PACKAGE TRAY MOTOR CIRCUIT 4. Package tray INSPECTION 5. A/C control TERMINALS OF ECU 6. Ambient temperature sensor PROBLEM SYMPTOMS TABLE 7. Driver door ECU TERMINALS OF ECU 8. Driver side power window HOW TO PROCEED WITH TROUBLESHOOTING 9. Passenger door ECU TERMINALS OF ECU 10. Passenger side power window HOW TO PROCEED WITH TROUBLESHOOTING 11. ECM HOW TO PROCEED WITH TROUBLESHOOTING Luggage door cannot be opened (Luggage front lock is not released) 1. Luggage closer motor circuit DTC B2513 OPEN IN LUGGAGE CLOSER MOTOR RH CIRCUIT 1. Luggage closer motor circuit DTC B2515 OPEN IN LUGGAGE CLOSER MOTOR LH CIRCUIT 2. Luggage closer motor LUGGAGE DOOR DRIVE MOTOR 3. Roof control switch ON-VEHICLE INSPECTION 4. Combination meter HOW TO PROCEED WITH TROUBLESHOOTING 5. Luggage room junction block ECU ELECTRONIC CIRCUIT INSPECTION PROCEDURE 6. Driver side junction block ECU ELECTRONIC CIRCUIT INSPECTION PROCEDURE 7. Tonneau cover switch TONNEAU COVER LIMIT SWITCH Luggage door cannot be opened or closed (Luggage front lock is released) 1. Luggage motor circuit DTC B2506 OPEN IN LUGGAGE DOOR DRIVE MOTOR RH CIRCUIT 1. Luggage motor circuit DTC B2508 OPEN IN LUGGAGE DOOR DRIVE MOTOR LH CIRCUIT 2. Luggage link REMOVAL Luggage door cannot be closed (Luggage front lock does not function) 1. Luggage closer motor circuit DTC B2513 OPEN IN LUGGAGE CLOSER MOTOR RH CIRCUIT 1. Luggage closer motor circuit DTC B2515 OPEN IN LUGGAGE CLOSER MOTOR LH CIRCUIT 2. Luggage closer motor LUGGAGE DOOR DRIVE MOTOR 3. Roof control switch ON-VEHICLE INSPECTION 4. Combination meter HOW TO PROCEED WITH TROUBLESHOOTING 5. Luggage room junction block ECU ELECTRONIC CIRCUIT INSPECTION PROCEDURE 6. Driver side junction block ECU ELECTRONIC CIRCUIT INSPECTION PROCEDURE Package tray does not function (No movement) 1. Package tray motor circuit DTC B2518 OPEN IN PACKAGE TRAY MOTOR CIRCUIT 2. Package tray INSPECTION Quarter window stops halfway 1. Quarter window regulator REMOVAL 2. Quarter window motor INSPECTION Indicator display does not change 1. Roof control switch ON-VEHICLE INSPECTION Warning buzzer does not sound 1. Combination meter HOW TO PROCEED WITH TROUBLESHOOTING Even though shift lever is on P or N, roof does not operate 1. Skid control ECU TERMINALS OF ECU 2. Speed sensor INSPECTION 2. Speed sensor INSPECTION
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.