Fault code B1412 – a step-by-step guide to diagnosing and fixing it

Error code B1412 is displayed and the check engine light is on - what does this mean?

The DTC B1412 is a body control module fault code that is recognized by the OBD/EOBD diagnostics and indicates a problem with the driver airbag slip ring. This trouble code relates to the airbag system and may have slightly different definitions for different manufacturers, but mainly relates to the electrical connection between the steering wheel and the vehicle body.

What causes can this fault code have?

• Defective airbag slip ring (spiral cable)
• Damaged cable connections in the steering wheel area
• Loose or corroded plug connections
• Faulty airbag control unit wiring
• Mechanical damage to the slip ring housing
• Wear due to frequent steering movements
• Moisture or corrosion in the electrical connections

What symptoms occur in parallel with fault code B1412?

• Airbag warning light: Permanent display of the airbag indicator light in the dashboard
• Horn does not work: Failure of the steering wheel horn due to interrupted slip ring connection
• Steering wheel controls: Functional failure of steering wheel buttons for radio, cruise control or telephone
• Airbag deactivation: Driver airbag may not be functional
• Intermittent problems: symptoms may appear or disappear depending on steering wheel position

How to fix the problem of fault code B1412?

• Repairing fault code B1412 usually requires professional help due to the safety-relevant airbag components.
• Replace the airbag slip ring: Complete replacement of the defective coiled cable with a new original part, including professional centering and calibration
• Clean and secure plug connections: Check and clean all electrical connections in the steering wheel area, followed by proper securing
• Carry out cable repair: Repair or replace damaged cables between slip ring and airbag control unit to appropriate specifications
• Airbag system reset: Professional recalibration of the entire airbag system after repair with appropriate diagnostic software
• Steering wheel disassembly and reinstallation: Professional disassembly of the steering wheel for slip ring repair in compliance with all safety regulations