B2624

Code

Generic B — Body

Front passenger seat position sensor circuit intermittent

Brand: Generic

Type: B — Body

Views: UK: 24 EN: 25 RU: 20

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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

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).
Inspect connectors at the front passenger seat and associated modules for corrosion, bent pins, water ingress, or loose terminals. Re-seat connectors.
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.
Perform a wiggle test: gently move harness and connectors along routing while monitoring live data to try to reproduce the intermittent condition.
Measure reference voltage and ground at the sensor connector with ignition on. Compare to manufacturer spec (commonly ~5 V reference).
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.
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.
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.
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.
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.