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Home / DTC / B2618 — Driver Seat Position Sensor Circuit Fault

B2618 — Driver Seat Position Sensor Circuit Fault

Detailed page for trouble code B2618.

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Code

B2618

Generic B — Body

Driver Seat Position Sensor Circuit Fault

Brand: Generic
Type: B — Body
Views: UK: 0 EN: 2 RU: 1
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Page language: EN

Causes

  • Broken or pinched wiring in seat harness (common at seat rail/hinge)
  • Corroded, loose or damaged connector at sensor or module
  • Failed seat position sensor (potentiometer or Hall-effect device)
  • Poor or broken ground or loss of reference voltage to sensor
  • Faulty seat control or occupant classification module
  • Water ingress or contamination of sensor/connector

Symptoms

  • Stored B2618 fault and related MIL or warning lamp illumination
  • Seat memory presets not working or cannot store positions
  • Seat adjustment may be intermittent or unresponsive
  • Occupant classification/airbag/seatbelt reminders may set warning codes or behave incorrectly
  • ABS/traction or other modules may report related communication or occupant-sensor faults
  • Audible/visual warning for seat system in some vehicles

What to check

  • Scan tool: read DTCs, freeze frame data and live data for seat position sensor
  • Perform visual inspection of seat wiring, connectors, and harness routing along seat rails and under seat
  • Inspect connectors for corrosion, bent pins, or water contamination
  • Check fuses and power supply circuits to seat module/sensor
  • Wiggle the harness while monitoring live sensor data to reveal intermittent faults
  • Confirm manufacturer SRS safety procedures before working around airbag/occupant sensors

Signal parameters

  • Sensor typically has: reference voltage ~5 V (from module), ground, and a variable signal line
  • Signal voltage normally varies proportionally with seat position (approx. 0–5 V across full travel)
  • Open circuit yields no signal (high/undefined), short-to-ground ≈0 V, short-to-battery ≈battery voltage
  • Resistance-type sensors show a variable resistance across travel; value should change smoothly without jumps

Diagnostic algorithm

  1. Retrieve DTC, freeze frame and any related codes with a capable scan tool. Note whether code is current or historical.
  2. Follow manufacturer SRS precautions (disconnect battery and wait specified time) before accessing seat connectors or occupant-sensing components.
  3. Visually inspect the seat, track, underside and connector for damage, corrosion, or foreign matter. Repair obvious damage.
  4. Reconnect battery (if removed for inspection) and backprobe the sensor connector with scan tool monitoring live data. Operate seat through full travel and observe signal behavior.
  5. Perform a wiggle test: move harness and connector while observing live data for intermittent jumps or dropouts.
  6. Measure reference voltage, signal voltage and ground continuity at the sensor connector with ignition ON. Verify reference ≈ reference spec (typically ~5 V), ground continuity to chassis, and that signal changes smoothly with position.
  7. If open/short is found in wiring, isolate by checking continuity from sensor connector to seat control module connector and repair/replace damaged wiring or connector. Replace terminal pins as needed.
  8. If wiring and power/ground are good but signal does not vary correctly, replace the seat position sensor (or seat track assembly) and re-test.
  9. If sensor replacement does not clear the fault, suspect the seat control/occupant classification module or communication issue — check module power/ground and bus communications, update software/reprogram as required.
  10. Clear codes and verify repair by cycling seat through full travel and confirming code does not return and related systems operate normally.

Likely causes

  • Wire harness fatigue at seat rail causing open/short when seat moves
  • Corroded terminal inside seat connector
  • Position sensor element worn or failed (resistance/voltage not changing with travel)
  • Missing or high-resistance ground at seat frame
  • Control module reporting internal fault or lost communication

Fault status

⚠️ Status
Driver Seat Position Sensor Circuit Fault — the control module detected an open, short, out-of-range or intermittent signal on the driver seat position sensor circuit. May affect seat memory and occupant detection systems.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

B2619 B2620 B2650 U0121 U0155
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