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Home / DTC / B1BAA — OCM configuration mismatch

B1BAA — OCM configuration mismatch

Detailed page for trouble code B1BAA.

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B1BAA

MITSUBISHI B — Body

OCM configuration mismatch

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

Causes

  • OCM replaced and not programmed/configured for this vehicle
  • Incorrect or incomplete module coding/calibration
  • Software version mismatch between OCM and other control modules
  • CAN communication errors or intermittent wiring faults
  • Corrupted module memory or internal fault
  • Previous repair where options (seat type, airbag options) were changed without updating OCM

Symptoms

  • SRS / airbag warning lamp illuminated
  • Passenger airbag enabled/disabled indicator may be incorrect or stay on
  • DTC B1BAA stored in SRS/Body ECU
  • Possible recorded passenger seat occupancy errors or no detection

What to check

  • Read and record all stored DTCs and freeze frame data with a factory-level scan tool
  • Confirm whether OCM (or related SRS module) was recently replaced or reprogrammed
  • Verify VIN, part number and software/calibration IDs for the OCM and compare to vehicle specification
  • Check CAN bus communication to OCM (bus active, no errors) and power/ground at module
  • Inspect seat connectors, airbag/occupancy sensor harnesses and related grounds for damage or corrosion
  • Confirm vehicle option list (seat type, passenger airbag option) matches module configuration

Signal parameters

  • OCM software/coding ID (part number, calibration ID)
  • OCM internal configuration flags (seat type, sensor presence, passenger airbag enable)
  • CAN bus messages to/from OCM (message counters, error frames)
  • Seat occupancy sensor raw values (if exposed)
  • Power supply and ground voltages at OCM connector

Diagnostic algorithm

  1. Use a factory-level scan tool to read all related SRS/Body codes and view OCM configuration data (part number, software/cali ID, VIN). Record results.
  2. Ask/verify vehicle history: any seat, airbag, or module replacement or aftermarket seat modifications?
  3. Visually inspect connectors, wiring and grounds for the OCM and passenger seat occupancy sensors. Repair any physical issues.
  4. Check CAN bus health: verify OCM responds to requests, inspect for error frames or bus interruptions.
  5. If module software/coding does not match vehicle, reprogram/configure OCM using manufacturer diagnostic software and correct calibration file for this VIN/options.
  6. After programming, clear DTCs and perform system tests (occupant detection tests if available) and confirm SRS lamp extinguishes and codes do not return.
  7. If DTC returns after correct coding, consider replacing OCM with correct part and ensure proper programming. If intermittent communication persists, investigate wiring/CAN network or other interfering modules.
  8. Document changes and perform a road or functional test per manufacturer guidelines to confirm repair.

Likely causes

  • OCM has been replaced and not reprogrammed to the vehicle VIN/options
  • Incorrect configuration stored in OCM software (wrong calibration file)
  • Faulty or intermittent CAN bus connection preventing configuration check
  • Connector or wiring problem at the passenger seat/OCM harness

Fault status

⚠️ Status
OCM configuration mismatch — module configuration/coding does not match vehicle specification or other networked modules. May require reprogramming or wiring/CAN repair.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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

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