B1964

Code

Other B — Body

Seat Horizontal Forward/Rearward Potentiometer Feedback Circuit Short To Battery

Brand: Other

Type: B — Body

Views: UK: 20 EN: 30 RU: 23

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Shorted signal wire to battery positive (B+) due to chafing, pin contact, or connector damage
Failed or internally shorted seat horizontal potentiometer (position sensor)
Corroded/contaminated connector or terminal causing unintended B+ connection
Damaged seat control module or internal electronics (less common)
Aftermarket equipment or damage to seat rails/harness (water ingress, pinch)

Symptoms

Seat cannot be adjusted horizontally or moves incorrectly
Seat position memory fails or reports incorrect position
Stored B1964 code (and possibly related seat position codes) in seat control module
Intermittent operation or works only after moving seat by hand
Blown related fuse or evidence of overheating at connector (rare)

What to check

Read and record DTCs and freeze/frame data with a scan tool
Visually inspect seat rails, wiring looms, connectors and seat module for damage, corrosion or melted insulation
Check related fuses and power feeds for signs of overheating
Verify SRS/airbag safety procedures before working near seat and disconnect battery per manufacturer directions if required
Backprobe the potentiometer signal, reference, and ground circuits with ignition ON (no engine)

Signal parameters

Reference (Vref) typically a regulated 5 V supply from seat module (verify with service data)
Normal potentiometer output: variable 0–5 V (depending on position)
Short-to-battery symptom: signal measures near battery voltage (≈12 V) or above expected Vref
Typical potentiometer total resistance: low kilo-ohm range (check vehicle-specific spec)
If signal >Vref or ≈battery voltage, suspect short to B+

Diagnostic algorithm

Record codes and vehicle-specific service information; note any additional seat-related DTCs
Perform a thorough visual inspection of wiring, harness grommets and seat rail for chafing, pinch points or water intrusion
With ignition ON (accessory), backprobe the potentiometer connector: measure Vref, signal and ground. Expected: Vref ≈5 V, signal 0–5 V. If signal ≈ battery voltage, continue.
Unplug the seat horizontal potentiometer/seat module connector and re-measure the suspected circuit at the harness side. If the high voltage disappears when disconnected, the short is downstream (in seat wiring or sensor). If it remains, the short is upstream toward the module/power feed.
Check continuity between the signal wire and battery positive (B+). Low resistance indicates a short. Also check for continuity to chassis ground where inappropriate.
Wiggle the harness and operate the seat while monitoring signal voltage to reproduce intermittent shorts (focus on seat track/rail area).
If harness and connectors appear OK and the short is tied to the sensor, remove the potentiometer assembly and bench-test: measure resistance between outer terminals and sweep the wiper; look for abnormal readings or direct short to B+.
If harness is damaged, repair or replace wiring and connectors using proper crimps, seals and routing away from pinch points. If potentiometer is faulty, replace the sensor or entire seat track assembly per service procedures.
Clear codes and perform a function test and road test (if required) to confirm repair. Re-scan for reappearance of DTCs.
Follow all manufacturer SRS precautions when reconnecting battery and working on or near seats equipped with airbags.

Likely causes

Wiring harness abrasion where it contacts the seat frame or track and contacts B+
Broken wire insulation at connector or along track and touching battery-powered circuit
Failed potentiometer where internal track contacts battery rail
Connector terminal pushed into housing contacting B+ terminal or accessory feed