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Home / DTC / B2624 — Front passenger seat position sensor circuit intermittent

B2624 — Front passenger seat position sensor circuit intermittent

Detailed page for trouble code B2624.

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B2624

Generic B — Body

Front passenger seat position sensor circuit intermittent

Brand: Generic
Type: B — Body
Views: UK: 3 EN: 5 RU: 1
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Page language: EN

Causes

  • Damaged, chafed or pinched wiring in the seat harness
  • Corroded, loose or pushed‑out connector pins at the seat or module
  • Poor or intermittent ground or reference voltage (e.g., 5V) to the sensor
  • Internal sensor (potentiometer/position sensor) intermittent/failing
  • Water/moisture ingress or contamination in connector or sensor
  • Aftermarket seat components (heaters, power rails) or previous repairs causing interference

Symptoms

  • SRS/airbag warning lamp or occupant classification system warning
  • Seat memory or seat position related features not working or intermittent
  • Seatbelt reminder or passenger classification messages varying or appearing intermittently
  • Diagnostic trouble code B2624 stored (may be stored intermittently)
  • Inconsistent live data for seat position (jumping, dropping out)

What to check

  • Read stored and pending DTCs and note freeze frame / occurrence conditions
  • Visually inspect seat harness, connectors, and routing for damage, corrosion, or loose clips
  • Wiggle test harness and connectors while monitoring live data to reproduce the fault
  • Check for moisture, debris or signs of previous repairs in connectors and sensor body
  • Verify connector pins are fully seated and not pushed back or bent
  • Check for related codes (other seat sensors, occupant classification, module faults)

Signal parameters

  • Reference supply typically 5 V (verify with service information); should be steady
  • Signal type may be variable analog voltage (0–5 V) or variable resistance (potentiometer style) — should change smoothly with seat movement
  • Expected resistance range (potentiometer style) commonly in low kΩ range; check OEM spec
  • Signal should not drop to open circuit or show intermittent spikes/noise under normal seat travel
  • If digital/CAN or LIN output is used, expect stable valid messages from occupant/seat module without intermittent loss

Diagnostic algorithm

  1. Retrieve and record all DTCs and freeze frame data. Note when/under what conditions the code set (e.g., seat position, ignition state, seat adjustment).
  2. Inspect connectors at the front passenger seat and associated modules for corrosion, bent pins, water ingress, or loose terminals. Re-seat connectors.
  3. With a scan tool, monitor live seat position data. Perform a controlled seat adjustment while observing the signal for dropouts, jumps or loss of signal.
  4. Perform a wiggle test: gently move harness and connectors along routing while monitoring live data to try to reproduce the intermittent condition.
  5. Measure reference voltage and ground at the sensor connector with ignition on. Compare to manufacturer spec (commonly ~5 V reference).
  6. Measure sensor signal voltage or resistance at rest and while moving the seat. Look for abrupt changes, open circuits or intermittent behavior. If unknown, consult service manual values.
  7. If an intermittent open or short is suspected, perform continuity checks from sensor pins to the module harness pins and inspect for high resistance/shorts. Repair any damaged wiring or terminal issues.
  8. If wiring and connectors test good, disconnect sensor and bench‑check (if removable) or replace sensor with known good unit and confirm fault no longer occurs.
  9. After repair or component replacement, clear codes and perform full functional test including multiple seat positions and road/ignition cycles to ensure the intermittent condition is resolved.
  10. If fault persists and wiring and sensor are verified good, consider module/ECU input circuit fault and consult OEM diagnostic procedures or technical service bulletins.

Likely causes

  • Corroded or loose connector pin at the seat harness or module
  • Wiring damage or chafe in the seat harness (movement area under seat)
  • Internal failure of the seat position sensor (wear or intermittent contact)
  • Poor ground or intermittent reference supply to sensor

Fault status

⚠️ Status
Front passenger seat position sensor circuit intermittent — intermittent/open/short or unstable position signal to module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B2623 B2625 B2610 B2611 B2640 B2650
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