B1952: Rear Seat Vertical Position Sensor Short
The B1952 code indicates that the Seat Control Module (SCM) or Body Control Module (BCM/GEM) has detected excessive voltage (a short to battery positive) on the feedback circuit of the rear seat up/down potentiometer. This sensor reports the vertical position of the seat cushion; when battery voltage is present on the signal line (which should carry a 5V reference or ground), the module cannot calculate the seat position, disabling memory functions and automatic power adjustment.
1. Commonly Affected Makes
2. Most Common Causes
- Internal failure of the rear seat vertical position potentiometer (short to positive)
- Chafed or pinched wiring in the potentiometer signal circuit contacting B+ power wires
- Damaged, corroded, or moisture-bridged terminals in sensor or module connectors
- Internal failure of the analog input driver in the Seat Control Module (SCM) or Driver Door Module (DDM)
3. Symptoms You Will Notice
- Rear seat power adjustment inoperative or intermittent
- Seat memory function not working
- Check engine or service seat warning light illuminated
4. Step-by-Step Diagnosis
Scan for B1952 and related codes; check freeze frame data.
Visually inspect the rear seat wiring harness for chafing, pinching, or damage near moving parts.
Test the potentiometer signal circuit for short to battery voltage using a multimeter.
Check connector terminals for corrosion, bent pins, or moisture intrusion.
If wiring and connectors are good, test the potentiometer itself; replace if shorted internally.
If all else passes, suspect a failed SCM/DDM module and perform module self-test or replacement.
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle is generally safe to drive, but the rear seat power adjustment and memory function will be disabled. Have it diagnosed soon to avoid further electrical issues.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on whether it's a wiring repair ($100-$200), potentiometer replacement ($150-$300), or module replacement ($300-$600).