Driver Seat Recline Motor Circuit Failure
The B1651 code indicates a fault in the driver seat recline motor circuit, specific to Toyota/Lexus vehicles. The seat control module (ECU) detects an anomaly such as an open circuit, short circuit, or abnormal resistance in the motor or its wiring. The system monitors current and voltage; if values fall outside expected parameters during operation, the code is set.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty or worn driver seat recline motor
- Damaged, corroded, or loose wiring in the seat harness (especially at flex points)
- Short to ground or voltage in the recline motor circuit
- Corroded, loose, or disconnected motor connector
- Faulty seat control module (ECU)
- Blown seat circuit fuse
3. Symptoms You Will Notice
- Driver seat does not recline or reclines intermittently
- Seat moves but with unusual noise or hesitation
- Seat position memory function may not work
4. Step-by-Step Diagnosis
Check for blown fuses related to the seat circuit
Inspect the recline motor connector for corrosion, damage, or looseness
Test the recline motor by applying direct power and ground to verify operation
Check wiring harness for breaks, chafing, or shorts, especially near seat movement areas
If wiring and motor are good, test the seat control module for proper output signals
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, but the seat may not recline properly, which can affect comfort and safety in an accident. Have it diagnosed soon.
How much does it cost to fix?▼
Typically $150–$400, depending on whether the motor ($100–$250) or control module ($200–$400) needs replacement, plus labor.