B1958

Code

Other B — Body

Seat Recline Forward/Backward Potentiometer Feedback Circuit Failure

Brand: Other

Type: B — Body

Views: UK: 21 EN: 28 RU: 21

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Open or short in the potentiometer signal, reference, or ground wiring
Corroded, loose, or damaged connector at the seat recline potentiometer or control module
Failed/degraded recline potentiometer inside the seat motor/actuator assembly
Poor ground or lost reference voltage from the body/seat control module
Intermittent contact caused by broken wires routed through the seat
Faulty seat control module or software fault (less common)

Read and record freeze-frame and live data with a scan tool; note when the code sets
Visually inspect seat trim, connectors, and harness where it flexes for chafe or damage
Check connector pins for corrosion, bent pins, or pushed out terminals
With ignition ON (engine off), measure reference voltage at the potentiometer connector
Check ground continuity from the potentiometer ground pin to chassis ground
Observe the potentiometer signal while moving the seat and watch for smooth, proportional change

Reference voltage (key ON): typically ~5 V (manufacturer-specific)
Potentiometer signal voltage: variable, generally ~0–5 V proportional to recline position
Potentiometer resistance: typically in the kΩ range and changes smoothly with position (manufacturer-specific)
No short to battery voltage or chassis ground expected on the signal line
Signal should change smoothly with continuous movement of the seatback

Connect a diagnostic scan tool, confirm B1958 and record any related codes and freeze-frame data.
Attempt to reproduce the complaint while monitoring live data for the recline potentiometer signal. Note if signal is missing, stuck, erratic, or implausible.
Perform a visual inspection of seat trim, connectors, and wiring routing (look for broken wires where harness bends).
With ignition ON (engine OFF), backprobe the potentiometer connector: verify reference voltage (≈5 V) and good ground.
Move seat back and forth while observing the signal voltage. A healthy potentiometer shows a smooth, continuous change in voltage across the range.
Check resistance across potentiometer terminals (with ignition OFF and connector disconnected) per manufacturer spec; look for opens or non-linear jumps.
Wiggle the harness and connectors while monitoring the signal to find intermittent shorts/opens. Repair wiring or connector faults as found.
If wiring and connector are good but the potentiometer signal is out of spec or non-linear, replace the recline potentiometer or seat motor/actuator assembly as required.
If replacement of sensor/actuator does not clear the fault, test/verify the seat control module’s outputs and inputs or update/reflash module software per manufacturer guidance.
After repairs, clear codes and verify proper operation and that the DTC does not return under normal seat operation.