Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / B1BA4 — PS.seat track POS.sensor(OCM)

B1BA4 — PS.seat track POS.sensor(OCM)

Detailed page for trouble code B1BA4.

34,405codes
59brands
11,914generic
22,491specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

B1BA4

MITSUBISHI B — Body

PS.seat track POS.sensor(OCM)

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

Causes

  • Damaged or disconnected seat track position sensor connector or wiring harness (under seat)
  • Corroded terminals or poor connector contact
  • Failed seat track position sensor (potentiometer or rotary encoder)
  • Obstruction, binding or mechanical damage to seat track causing sensor to read incorrectly
  • Faulty Occupant Classification Module (OCM) or internal module fault
  • Water intrusion or contamination at the sensor or connector

Symptoms

  • Airbag / SRS warning lamp illuminated
  • Passenger airbag enable/disable behavior incorrect or locked out
  • Occupant Classification warnings or messages on dash
  • Seatbelt reminder or seat position related warnings
  • Possible inability to perform seat/OCM calibrations

What to check

  • Use a scan tool to read stored codes and live data from the OCM; note freeze frame and relevant PIDs
  • Visually inspect seat underside, sensor, connector and wiring for damage, corrosion or water ingress
  • Wiggle test wiring and connector while monitoring live sensor value to reproduce fault
  • Check for additional related SRS/OCM codes
  • Verify connector pins are fully seated and terminals are intact

Signal parameters

  • Reference voltage present at sensor connector (typically ~5 V or vehicle reference voltage) — confirm with DMM
  • Signal voltage varies with seat position (commonly within ~0.5–4.5 V range depending on sensor type)
  • Sensor may be a variable resistor — expected resistance changes smoothly as seat moves
  • Continuity to ground where applicable — no short to battery or ground
  • No intermittent open circuit when moving seat

Diagnostic algorithm

  1. Read and record all related DTCs, freeze-frame and live data from OCM using a capable scan tool. Do not clear codes yet.
  2. Visually inspect passenger seat rails, sensor assembly and connectors for obvious damage, corrosion or foreign objects.
  3. With ignition on, monitor live sensor output while moving seat through full travel. Note whether reading changes smoothly or if it drops out/intermittent.
  4. Perform wiggle test on wiring and connectors while observing the live sensor value for interruption or noise.
  5. With battery disconnected, unplug the sensor connector and inspect terminals for bent pins, corrosion or pushed-out terminals. Repair as needed.
  6. Measure reference, signal and ground at the sensor connector with a DMM/oscilloscope. Compare to expected generic parameters (reference ~5 V, signal varies with position).
  7. Check continuity between sensor connector and OCM connector for open circuits and for shorts to ground/power. Pay attention to flex points and seat belt anchorage areas.
  8. If wiring and connectors are good but signal is invalid, bench-test or replace the seat track position sensor, then recheck system operation.
  9. If new sensor does not cure the fault, verify OCM wiring and power/ground; consider OCM fault — consult vehicle-specific repair information before replacing OCM.
  10. After repair, clear codes and perform required OCM/seat position calibrations and SRS system self-test per manufacturer procedure. Verify no recurrence.

Likely causes

  • Broken/frayed wiring where harness flexes at seat base
  • Loose or pushed-out connector terminal under the seat
  • Sensor element worn or internally open/shorted
  • Seat track misalignment preventing normal sensor movement
  • Corrosion in connector from spilled liquids

Fault status

⚠️ Status
OCM reports passenger seat track position sensor circuit fault (open/short/implausible). Verify sensor, wiring and connector under passenger seat.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1BA0 B1BA1 B1BB4 B1B94 B1BC0
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

Report

Harassment or bullying behavior
Contains mature or sensitive content
Contains misleading or false information
Contains abusive or derogatory content
Contains spam, fake content or potential malware

Block Member?

Please confirm you want to block this member.

You will no longer be able to:

  • See blocked member's posts
  • Mention this member in posts
  • Invite this member to groups
  • Message this member
  • Add this member as a connection

Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.

Report

You have already reported this .