Driver Seat Rear Down Circuit Open
The B1758 code indicates an open circuit in the driver seat rear height adjustment motor circuit. This means the seat control module (SCM or DSM) has detected a break in the electrical path that powers the motor responsible for lowering the rear portion of the driver seat. As a result, the seat may not move downward at the rear, or the adjustment function may be completely inoperative.
1. Commonly Affected Makes
2. Most Common Causes
- Open or broken wire in the driver seat rear tilt motor circuit
- Disconnected or corroded connector in the seat wiring harness
- Faulty seat motor with an internal open circuit
- Blown fuse in the seat circuit
- Damaged seat control switch
3. Symptoms You Will Notice
- Driver seat rear height does not adjust downward
- Seat adjustment function may be completely unresponsive
4. Step-by-Step Diagnosis
Check the seat circuit fuse and replace if blown.
Inspect the wiring and connectors at the seat motor and control module for damage, corrosion, or disconnection.
Test the seat motor by applying power and ground directly; if it doesn't run, replace the motor.
Verify the seat control switch operation and continuity.
If all else is normal, test the seat control module and replace if faulty.
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive, but the seat adjustment may be limited. Fix it promptly for comfort and to avoid further electrical issues.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on whether the issue is a simple wiring repair or requires replacing the seat motor or control module.