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.
2012 Lexus IS 350CFACTORY OEM SERVICE PROCEDURE
Retractable Hardtop System
RETRACTABLE HARDTOP SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| B2501 | Short in Roof Drive Motor RH Circuit |
| B2502 | Open in Roof Drive Motor RH Circuit |
| B2503 | Short in Roof Drive Motor LH Circuit |
| B2504 | Open in Roof Drive Motor LH Circuit |
| B2505 | Short in Luggage Door Drive Motor RH Circuit |
| B2506 | Open in Luggage Door Drive Motor RH Circuit |
| B2507 | Short in Luggage Door Drive Motor LH Circuit |
| B2508 | Open in Luggage Door Drive Motor LH Circuit |
| B2509 | Short in Pulse Width Modulation Motor RH Circuit |
| B250A | Open in Back Window Panel Drive Motor RH Circuit |
| B250B | Short in Back Window Panel Drive Motor RH Circuit |
| B250C | Open in Back Window Panel Drive Motor LH Circuit |
| B250D | Short in Back Window Panel Drive Motor LH Circuit |
| B250E | Open in Back Window Panel Lock Motor Circuit |
| B250F | Open in Luggage Door Closer Motor RH Circuit |
| B2510 | Short in Pulse Width Modulation Motor LH Circuit |
| B2511 | Open in Roof Lock Motor Circuit |
| B2516 | Open in Quarter Window Motor RH Circuit |
| B2517 | Open in Quarter Window Motor LH Circuit |
| B2518 | Open in Package Tray Motor Circuit |
| B2519 | Open in Side Package Tray Motor RH Circuit |
| B251A | Open in Side Package Tray Motor LH Circuit |
| B251B | Short in Quarter Window Motor RH Circuit |
| B251C | Short in Quarter Window Motor LH Circuit |
| B251D | Short to GND in Roof or Quarter Window Motor RH Circuit |
| B251E | Short to GND in Roof or Quarter Window Motor LH Circuit |
| B251F | Open in Luggage Door Closer Motor LH Circuit |
| B2520 | Roof Lock Switch Malfunction |
| B2521 | Roof Close Switch RH Malfunction |
| B2522 | Roof Close Switch LH Malfunction |
| B2523 | Roof Position Switch No. 1 Malfunction |
| B2524 | Roof Position Switch No. 2 Malfunction |
| B2527 | Roof Open Switch Malfunction |
| B252A | Back Window Panel Close Switch Abnormal Operation |
| B252B | Back Window Panel Open Switch Abnormal Operation |
| B252C | Back Window Panel Position Switch Abnormal Operation |
| B252E | Luggage Door Position Switch Abnormal Operation |
| B252F | Luggage Door Open Switch No.2 Abnormal Operation |
| B2531 | Luggage Door Open Switch Malfunction |
| B2532 | Package Tray Switch No. 1 Malfunction |
| B2533 | Package Tray Switch No. 2 Malfunction |
| B2534 | Package Tray Switch No. 1 or No. 2 Malfunction |
| B2535 | Tonneau Cover Switch Malfunction |
| B2536 | Luggage Courtesy Switch Malfunction |
| B2537 | Roof Control Switch Malfunction |
| B2538 | Abnormal Roof Drive Motor RH Pulse |
| B2539 | Abnormal Roof Drive Motor LH Pulse |
| B253B | Back Window Panel Lock Switch Abnormal Operation |
| B253C | Package Tray Switch No.3 Abnormal Operation |
| B253D | Side Package Tray Switch No.1 RH Abnormal Operation |
| B253E | Side Package Tray Switch No.2 RH Abnormal Operation |
| B253F | Side Package Tray Switch RH Abnormal Operation |
| B2540 | Abnormal Difference Between RH and LH Roof Drive Motor Pulse |
| B2541 | Abnormal Luggage Door Drive Motor RH Pulse |
| B2542 | Abnormal Luggage Door Drive Motor LH Pulse |
| B2543 | Abnormal Difference between RH and LH Luggage Door Drive Motor Pulse |
| B2545 | ECM Communication Stop |
| B2546 | Combination Meter ECU Communication Stop |
| B2548 | Driver Side J/B ECU Communication Stop |
| B2549 | Driver Door ECU Communication Stop |
| B254A | Side Package Tray Switch No.1 LH Abnormal Operation |
| B254B | Side Package Tray Switch No.2 LH Abnormal Operation |
| B254C | Side Package Tray Switch LH Abnormal Operation |
| B254D | Back Window Panel RH Pulse Sensor Abnormal Operation |
| B254E | Back Window Panel LH Pulse Sensor Abnormal Operation |
| B254F | Unequal RH and LH Back Window Panel Pulse Sensor values Malfunction |
| B2550 | Passenger Door ECU Communication Stop |
| B2553 | Sliding Roof Control ECU Malfunction |
| B2555 | A/C ECU Communication Stop |
| B2556 | Motor Lock in Roof Drive Motor(RH) |
| B2557 | Motor Lock in Roof Drive Motor(LH) |
| B2558 | Motor Lock in Luggage Door Drive Motor(RH) |
| B2559 | Motor Lock in Luggage Door Drive Motor(LH) |
| B255A | Lost Communication with Clearance Sonar ECU |
| B255B | Luggage Door Closer Neutral Position Switch RH Abnormal Operation |
| B255C | Luggage Door Closer Switch RH Abnormal Operation |
| B255D | Luggage Door Closer Neutral Position Switch LH Abnormal Operation |
| B255E | Luggage Door Closer Switch LH Abnormal Operation |
| B2560 | Motor Lock in Roof Lock Motor |
| B2563 | Motor Lock in Package Tray Motor Circuit |
| B2564 | Difference between RH and LH Roof Drive Motor Pulse |
| B2565 | Difference between RH and LH Luggage Door Drive Motor Pulse |
| B2566 | Quarter Window Switch RH Abnormal Operation |
| B2567 | Quarter Window Switch LH Abnormal Operation |
| B2568 | Lock in Back Window Panel Drive Motor RH Circuit |
| B2569 | Lock in Back Window Panel Drive Motor LH Circuit |
| B256A | Lock in Back Window Panel Lock Motor Circuit |
| B256B | Lock in Side Package Tray Motor RH Circuit |
| B256C | Lock in Side Package Tray Motor LH Circuit |
| B256D | Lock in Quarter Window Motor RH Circuit |
| B256E | Lock in Quarter Window Motor LH Circuit |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.