Rear Seat Height Potentiometer Circuit Fault
The B1950 code indicates a fault in the rear seat height adjuster potentiometer feedback circuit. This means the seat control module has detected an out-of-range voltage, open circuit, or short circuit in the wiring that reports the seat's physical position. The potentiometer tells the module the exact position of the lift motor to prevent mechanical damage from over-extension. As a body code (B1xxx), it is manufacturer-specific per SAE J2012.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged or out-of-calibration seat height potentiometer
- Feedback circuit wiring shorted to ground or voltage
- Loose, corroded, or bent terminals in the seat connector
- Open circuit or break in the potentiometer wiring
- Faulty rear seat control module
3. Symptoms You Will Notice
- Rear seat height adjustment inoperative or erratic
- Seat may not move up or down, or moves only partially
4. Step-by-Step Diagnosis
Scan for B1950 and any related codes; clear and retest to confirm active fault.
Visually inspect the seat wiring harness and connector for damage, corrosion, or bent pins.
Measure potentiometer signal voltage at the module connector; should vary smoothly with seat movement.
Check for shorts to ground or power in the feedback circuit using a multimeter.
If wiring and potentiometer check out, suspect a faulty seat control module.
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle remains safe to drive. The fault only affects rear seat height adjustment, not safety systems.
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 potentiometer or control module.