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Home / DTC / B1B8D — DR.seat track POS.sensor low

B1B8D — DR.seat track POS.sensor low

Detailed page for trouble code B1B8D.

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Code

B1B8D

MITSUBISHI B — Body

DR.seat track POS.sensor low

Brand: MITSUBISHI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or corroded connector at the seat track position sensor
  • Broken, pinched or fatigued wiring in the seat harness (common at the seat cushion/track flex point)
  • Failed/dirty seat track position sensor (potentiometer)
  • Short to ground on the sensor signal circuit
  • Poor ground or lost reference voltage from control module
  • Water ingress or contamination of sensor/connector

Symptoms

  • Steady or intermittent seat track position fault stored in memory (DTC present)
  • Seat position memory or automatic seat functions may not operate correctly
  • Driver seat position readout incorrect or unavailable (if vehicle displays position)
  • Possible related warnings or inhibited features that depend on seat position (e.g., seat memory, occupant detection integration)
  • Unusual behavior when moving the seat (stiffness or loss of position tracking)

What to check

  • Read and record freeze-frame data and any related seat/airbag/body module codes
  • Visually inspect the seat track sensor connector for corrosion, bent pins, contamination or water entry
  • Inspect wiring along the seat harness, especially at the seat cushion hinge and rail flex points for broken strands or chafing
  • Wiggle the harness and connector while monitoring live data to reproduce the fault or observe intermittent signal
  • Check for any signs of mechanical binding or debris in the seat track that could prevent normal sensor movement
  • Verify vehicle service bulletins for known issues or harness repair procedures for the seat track

Signal parameters

  • Sensor reference voltage typically supplied by control module: ~5 V (verify with service manual)
  • Sensor ground: near 0 V (solid chassis or module ground)
  • Signal voltage expected to vary across travel: approximately 0.5–4.5 V (low at one end, high at the other)
  • With harness disconnected: check for ~5 V reference between reference pin and ground, and continuity to module ground
  • Resistance of potentiometer will change smoothly as seat is moved; abrupt open or infinite resistance indicates internal failure

Diagnostic algorithm

  1. Retrieve DTC(s) and related module data. Note conditions when code set and clear codes. Attempt to reproduce code by cycling seat position.
  2. Perform visual inspection of sensor, connector and harness. Pay special attention to flex points and seat mounting bolts for chafing.
  3. Backprobe connector with ignition ON (engine off) and measure: a) reference voltage (expect ~5 V), b) ground continuity to chassis/module ground, c) signal voltage while slowly moving seat through full travel. Record values and note if signal stays low or is erratic.
  4. Wiggle test wiring and connector while observing live signal for intermittent changes. If fault changes with movement, repair/replace wiring/repair connector.
  5. If reference and ground are present and signal does not change or is stuck low, disconnect sensor and measure sensor resistance (or specified pin-to-pin resistances) across travel. If resistance is open, shorted, or does not vary smoothly, replace sensor/seat track assembly.
  6. If the sensor checks good but signal is still low at the module connector, trace continuity from module to sensor and check for shorts to ground. Repair wiring harness as needed.
  7. After repairs, clear codes and verify by cycling seat and performing road/ignition cycles to ensure code does not return.
  8. If wiring and sensor OK but fault persists, verify control module input circuit and update/replace module per manufacturer guidance.

Likely causes

  • Worn or broken wires at seat harness flex area
  • Corroded/loose connector pins at the sensor
  • Failed seat track potentiometer (sensor)
  • Intermittent connection due to seat movement

Fault status

⚠️ Status
Driver seat track position sensor voltage low — check sensor, connector and wiring for damage, corrosion or open/short.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 1.5 hours

Similar codes

B1B8C B1B8E B1B8F B1B9D
406

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