Airbag Clock Spring Broken / Hard Disk Failure (COM 2000 / COM 2005 Module)

• Most affected models: C3 (generations 1 and 2), Xsara Picasso, C4 Hatch/Pallas and C4 Lounge.
• What happens: The airbag or child restraint system warning light remains permanently illuminated on the dashboard. The driver may notice a subtle scraping or cracking noise of plastic behind the steering wheel when turning the car. In advanced cases, the steering wheel audio controls or the horn may also stop working.

What to check:

1. Error persisting when steering: Start the vehicle and turn the steering wheel fully from side to side. If the airbag light flashes or illuminates specifically when the steering wheel changes position, the inner track is broken.
2. Resistance reading via scanner: When connecting the diagnostic equipment, the error code will indicate “Driver’s airbag open circuit” (level 1 or level 2).
3. Functioning of the other commands: Test if the headlight, turn signal, and wiper switches continue to respond. If only the central steering wheel controls fail, the diagnosis on the flexible strip is confirmed.

Solution:

• Preventive: When performing any maintenance on the steering box, steering column, or alignment that requires removing the steering wheel, it is mandatory to lock the wheels in a straight line and secure the steering wheel hub. If the steering wheel spins freely with the box disconnected, the inner tape will be stretched beyond its limit and will break on the first turn.
• Corrective: The definitive repair requires replacing the internal flexible cable (flat cable). Although the manufacturer only sells the complete turn signal switch (COM 2000 module), the Brazilian aftermarket currently only offers the specific flat cable or the mechanism. hard disk Separately, this allows a technician specializing in automotive electronics to replace the internal component without needing to purchase the entire part from a dealership.