B1950

Code

Other B — Body

Seat Rear Up/Down Potentiometer Feedback Circuit Failure

Brand: Other

Type: B — Body

Views: UK: 31 EN: 33 RU: 27

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Open, short, or high resistance in the potentiometer signal, reference, or ground circuit
Corroded, loose, or damaged seat harness connector
Failed seat rear up/down potentiometer or position sensor inside seat motor assembly
Faulty seat control module or wiring to the module
Water intrusion or mechanical damage to seat assembly

Scan for stored and pending codes and capture freeze-frame data
Visual inspection of seat harness, connectors, and for water/damage
Backprobe potentiometer connector and check reference voltage and signal while operating seat
Measure continuity and resistance of the harness between potentiometer and seat module
Wiggle harness while exercising seat to check for intermittent faults
Inspect related fuses and grounds for continuity

Reference supply: typically 5 V reference from seat control module (verify factory spec)
Signal output: variable voltage proportional to position, commonly ~0.5–4.5 V across travel (mid position ≈2.5 V)
Ground: near 0 V reference when measured to battery negative
Open circuit: no signal (OL) or floating voltage
Short to battery: signal near battery voltage (~12 V) indicates short to power

Connect a scan tool, confirm B1950 and record freeze-frame and relevant live data for the rear up/down potentiometer.
Visually inspect seat, connectors, and wiring for damage, corrosion, or water. Repair obvious damage before further testing.
With ignition ON (engine off), backprobe the potentiometer connector: verify reference voltage (≈5 V) and good ground. If missing, diagnose upstream wiring and fuses.
While an assistant moves the seat through full travel, observe the potentiometer signal voltage. A good sensor shows a smooth, continuous change (≈0.5–4.5 V). Note any dead zones or jumps.
If signal is absent or erratic, disconnect the potentiometer and measure resistance across the pot terminals while manually moving the seat or pot shaft. Resistance should change smoothly without open/shorts. Replace if erratic or open.
Check continuity and resistance of signal, reference, and ground wires between the potentiometer connector and the seat control module. Repair any open or high-resistance circuits.
Inspect for short to power or ground using a multimeter. Repair wiring shorts as needed.
If wiring and potentiometer check good, verify proper inputs/outputs at the seat control module. Consider module replacement or reprogramming only after confirming external circuits are good.
After repairs, clear codes, operate the seat through full travel and re-scan to confirm the fault does not return.