Seat Position Sensor Circuit Short to Ground
The B1965 code indicates that the Seat Control Module (SCM) has detected a short to ground in the feedback circuit of the horizontal seat position potentiometer (forward/rearward). This potentiometer is a variable resistor that reports the seat's current position to the module. The short to ground prevents the SCM from receiving a valid voltage signal, which can cause the seat to not respond to adjustment commands or disable the memory position function. According to SAE J2012, codes B1900-B1999 correspond to comfort and convenience system faults, specifically in feedback potentiometer circuits.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged or worn horizontal seat position motor potentiometer
- Wiring between the potentiometer and SCM with deteriorated insulation shorting to ground
- Corroded or bent pins in the sensor connector causing a short circuit
- Internal failure of the Seat Control Module (SCM) misinterpreting the signal
- Mechanical damage to the seat harness due to friction wear as the seat moves
3. Symptoms You Will Notice
- Seat does not move forward or backward when using the adjustment switch
- Seat memory position function is inoperative or erratic
4. Step-by-Step Diagnosis
Scan the SCM for fault codes and verify B1965 is present
Visually inspect the seat wiring harness for damage, chafing, or pinched wires
Check the potentiometer connector for corrosion, bent pins, or poor contact
Measure resistance between the potentiometer signal wire and ground; a short to ground will show near zero ohms
If wiring and connector are good, test the potentiometer by moving the seat and monitoring the signal voltage; replace if out of range
If all else is normal, suspect a faulty SCM and perform a module self-test or replacement
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle is safe to drive. The seat may not adjust electrically, but manual adjustment is still possible, and the issue does not affect drivability.
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, a potentiometer replacement, or a seat control module replacement.