Code
B1B93
MITSUBISHI
B — Body
PS.seat track POS.sensor low
Views:
UK: 14
EN: 26
RU: 22
AI status
Completed
Completed
100%
Causes
- Short to ground or low-voltage condition on the sensor signal circuit
- Damaged, corroded, or disconnected connector at the seat track sensor
- Broken or pinched wiring harness in or under the seat (common at seat rails)
- Failed seat track position sensor (potentiometer or Hall sensor)
- Faulty occupant detection/body control/SRS module input or internal fault
- Water ingress or contamination in connector or sensor
Symptoms
- Stored fault code B1B93 (PS seat track POS sensor low)
- Possible SRS/airbag warning lamp or occupant classification warning on dash
- Seat-position-related features may not operate correctly (e.g., seat memory)
- Seatbelt reminder or pre-tensioner logic may be affected depending on model
- Intermittent faults when seat is moved or weight applied
What to check
- Retrieve freeze frame and live data with a scan tool; confirm sensor reading is low or stuck at a low value
- Visually inspect seat track area, connector, and harness for damage, corrosion, or pinching
- Wiggle seat while watching live data to see if reading changes (intermittent wiring issue)
- Check connector pins for corrosion, bent pins, or poor contact; disconnect and inspect both sides
- Measure sensor signal voltage and reference voltage at the connector with ignition ON (refer to factory values)
- Check continuity and resistance of signal and ground circuits back to module; look for shorts to ground
Signal parameters
- Expected: sensor signal should vary smoothly across seat travel (typical potentiometer/Hall output varies between ~0.5 V and ~4.5 V) — model-dependent
- Fault condition: signal is low or near 0 V (below module threshold)
- Reference/ignition supply voltage typically ~5 V or other nominal reference — verify against wiring diagram
- Signal should show continuity to the module input when connector is disconnected (check per wiring diagram)
Diagnostic algorithm
- Connect a scan tool and confirm current/recorded B1B93 fault and live sensor value; note freeze-frame data.
- Perform a visual inspection of the seat track, sensor, and wiring harness for obvious damage, chafing, or corrosion.
- With ignition ON (but engine off), backprobe the sensor connector: verify reference voltage, ground, and sensor output. Compare to expected ranges from manufacturer data.
- Wiggle the seat and harness while monitoring the live sensor value to reveal intermittent opens/shorts at the rails or connector.
- If signal is low, check for a short to ground on the signal wire by measuring continuity between signal wire and chassis ground with ignition OFF. Repair any shorted wiring.
- Check continuity/resistance of signal and ground wires from sensor connector to the controlling module. Repair any open or high-resistance connections.
- Clean and reseat connector; if corrosion or damage is present, replace connector or wiring pigtail as needed.
- If wiring and connectors check good, replace the seat track position sensor and retest.
- After repair, clear codes, cycle ignition and perform functional test and road test if required. Verify fault does not return.
- If fault persists after sensor and wiring replacement, inspect/replace the controlling module only after confirming module inputs are correct and following manufacturer guidance.
Likely causes
- Wiring damaged at seat rail where cables flex and pinch
- Connector corroded or pushed out of position after seat removal
- Sensor internal short or worn potentiometer causing near-zero output
- Short to ground on the sensor signal wire
Fault status
Status
Seat track position sensor signal low (below expected threshold) detected by control module.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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