Code
B2894
Generic
B — Body
Driver Seat Position Sensor Circuit Low
AI status
Completed
Completed
100%
Causes
- Damaged or shorted sensor wiring (short to ground)
- Faulty driver seat position sensor (potentiometer/encoder)
- Poor or corroded electrical connector or terminals
- Poor ground or reference voltage to the sensor
- Control module (airbag/seat/memory module) internal fault
- Water ingress or mechanical damage to seat track or sensor assembly
Symptoms
- Airbag/airbag readiness or SRS warning light illuminated
- Seat memory functions may not operate correctly
- Occupant classification/seat belt reminders or airbag suppression behavior abnormal
- Possible stored seat position faults or inability to detect seat position
- Noisy or intermittent operation of power seat (if sensor integrated)
What to check
- Visual inspection of seat wiring, connectors and seat-track area for damage, pinching or corrosion
- Scan tool: read fault code, freeze frame and live data for seat position sensor output
- Backprobe sensor connector with ignition ON and record signal voltage while moving seat
- Check for presence of specified reference voltage (usually 5 V) and solid ground at sensor connector
- Perform continuity check from sensor signal/ground pins to the control module to detect shorts or opens
- Wiggle test wiring while monitoring live data to reproduce fault
Signal parameters
- Typical reference voltage: 5 V (check manufacturer spec)
- Expected signal output: variable 0–5 V (seat full forward ≈ near 0 V, full rear ≈ near 5 V) — a constant ≈0 V indicates ‘low’
- Sensor ground should be
- If a two-wire variable resistor, resistance varies smoothly through travel (check against spec)
- Module input sees near 0 V when fault is reported (indicates short to ground)
Diagnostic algorithm
- Retrieve and record DTC and any freeze frame data with a scan tool
- Perform visual inspection of seat, connectors, and harness for damage or corrosion; correct obvious issues
- Disable vehicle electrical system/airbag power per manufacturer procedures before disconnecting components
- Backprobe the sensor connector with ignition ON (modules awake) and measure: reference voltage, signal voltage, and ground continuity while moving the seat
- If signal is stuck low at the connector, disconnect the sensor and re-check signal at the harness side to isolate sensor vs wiring. If signal remains low, suspect wiring/short to ground
- Perform continuity tests between the sensor signal wire and chassis ground to locate any intentional short; repair short if found
- If wiring and connectors are good, swap or bench-test the sensor (or replace with known-good) and re-check operation
- After repair, clear codes, perform functional test moving seat through full travel and re-scan to confirm code does not return
- If all harness and sensor checks pass, consider control module input fault and consult manufacturer procedures for module testing or replacement
Likely causes
- Broken or pinched harness under the seat causing a short to ground
- Connector contacts corroded or pushed out on the seat sensor plug
- Seat sensor failed from wear or impact
- Ground lead loose or disconnected at seat or body ground point
Fault status
Status
Driver seat position sensor circuit voltage is below expected range — low/signal short to ground detected.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Brands with available manuals
8,992
The library contains 8,992 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email