B1963

Code

Other B — Body

Seat Horizontal Forward/Rearward Potentiometer Feedback Circuit Open

Brand: Other

Type: B — Body

Views: UK: 22 EN: 29 RU: 22

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Page language: EN

Causes

Broken or chafed wiring in the potentiometer harness
Corroded, loose or pushed‑out connector pins
Failed seat horizontal potentiometer (inside seat track assembly or motor)
Poor ground or missing reference voltage from the control module
Faulty seat position control module or seat module software malfunction
Damage from seat movement (pinched wires) or water intrusion

Symptoms

Seat will not move horizontally (forward/rear) or movement is intermittent
Seat position memory does not work or recalls incorrect position
Seat adjustment operates in one direction only or is erratic
Diagnostic trouble code B1963 stored; possible SRS/airbag or seat belt reminder related warnings on some vehicles

What to check

Scan for stored codes and view live data/feedback from the seat potentiometer
Visually inspect seat wiring harness, connectors, and seat track for damage or pinched wiring
Wiggle test wiring with connector installed while observing live data for intermittent change
Measure reference voltage, signal voltage and ground at the potentiometer connector with ignition on
Check continuity between module connector and potentiometer connector for open circuits
Inspect for water intrusion or corrosion at connectors and inside seat base

Signal parameters

Typical potentiometer configuration: three wires — reference (approx. 5 V), signal (0–5 V variable with position), and ground
Expected signal voltage at opposite travel extremes: ~0.5 V to ~4.5 V (varies by manufacturer)
Open-circuit condition: signal line shows no voltage or battery voltage dependent on wiring; continuity to module open
Typical potentiometer resistance range: a few hundred ohms to several kiloohms (manufacturer specific)

Diagnostic algorithm

Retrieve and record freeze frame and all related seat/position codes. Clear codes and attempt to reproduce to confirm persistence.
Visually inspect seat track, connectors under the seat, and harness routing for damage, pinched wires, or corrosion.
Using a scan tool, view live potentiometer output while commanding seat forward/rear. Note if signal changes or is stuck/open.
With ignition on, backprobe the potentiometer connector: verify reference voltage (~5 V) and good chassis/return ground. If reference missing, trace to module.
Measure signal voltage while moving the seat (or command with switch). If signal is fixed or absent, suspect open wiring or failed potentiometer.
Check continuity between module connector pin and potentiometer signal/ground pins. Repair any open or high-resistance circuits.
If wiring and connectors are good, replace or bench-test the potentiometer/seat track assembly per manufacturer procedure.
After repair, clear codes and verify proper operation and that no related faults remain. Reconnect battery power and re-enable SRS procedures if applicable.
Caution: many seats contain SRS/airbag components and occupancy sensors. Follow the vehicle manufacturer’s recommended SRS disabling procedures before removing the seat or disconnecting components.

Likely causes

Open or broken wire in the harness between seat potentiometer and module
Connector corrosion or poor pin contact at the seat or module connector
Failed potentiometer within the seat track assembly

Fault status

⚠️ Status

Stored when the seat horizontal potentiometer feedback circuit is open or signal is outside expected range. The seat control module detects loss of position feedback and logs B1963; horizontal adjustment or memory functions may be disabled until the fault is corrected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.5 hours