Seat Recline Position Sensor Open Circuit
The B1959 code indicates that the seat control module has detected an open circuit in the position feedback potentiometer for the seatback recline mechanism (forward/backward). This variable resistor sends a voltage signal proportional to the seatback angle to the control module, enabling memory positioning and precise feedback. An open circuit interrupts this signal, typically due to a wiring fault, damaged connector, or a failed sensor integrated into the seat actuator, resulting in loss of position reference and potential issues with automatic or memory seat adjustments.
1. Commonly Affected Makes
2. Most Common Causes
- Open or short circuit in the wiring between the seat control module and the recline potentiometer
- Damaged, corroded, or disconnected connector at the seatback position sensor
- Internal failure of the potentiometer within the seat recline motor or actuator
- Faulty seat control module (SCM/DSM) unable to read the sensor signal
- Poor ground or high resistance in the sensor return circuit
3. Symptoms You Will Notice
- Seatback recline memory function not working
- Seat fails to move to preset positions
- Seat adjustment intermittent or unresponsive
- Check engine or seat warning light illuminated
4. Step-by-Step Diagnosis
Scan for codes and verify B1959 is present
Inspect wiring and connectors between seat module and recline potentiometer for damage or corrosion
Test potentiometer resistance and voltage signal at the actuator connector
Check for proper ground and power at the seat control module
If wiring and sensor are good, replace the seat control module
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive. The issue only affects seat memory and adjustment functions, not vehicle safety systems.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on whether the fix involves wiring repair, connector replacement, or replacing the seat actuator assembly.