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Lock and horn problem

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I have two issues with my 2002 C2 cab with 85k miles that I think are unrelated although I noticed them both for the first time yesterday.

1. The main horn always works when the ignition is off. When the ignition is on, the horn sometimes does not work. I determined that if the steering wheel has been turned, the horn may start to work. Having read the various horn issue threads leads me to believe that the wire from the horn switch in the steering wheel is the likely culprit. Does this sound reasonable or is there other troubleshooting that I should do?

2. When the ignition is turned to on, the central locking switch on the dashboard immediately lights up and stays on. If I try to unlock using this switch, I get a double alarm beep and the switch stays lit. This seems sporadic and possibly ambient temperature related. With the cabriolet top up, when I open the driver side door from the inside or outside, the window does not move. The passenger side works as expected. Durametric shows three alarm module codes:

47 Central Locking Synchronization (Occurrence Counter 2)

54 Radio Receiver Defective (Occurrence Counter 5)

61 Central Locking Limit Position Unlock Not Reached (Occurrence Counter 27)

Code 54 does not concern me because I did not clip the radio alarm wire when installing a different radio. Based on reviewing other threads, the other two codes lead me to suspect the door lock assembly unit that contains five microswitches. Again, does this seem reasonable, and if so does it make sense to replace the two door handle switches at the same time since they're relatively cheap?

Thanks for your insights.

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  • Admin

Yup sounds like (sorry for the pun) you have a bad connection in the steering wheel. Use the right tools and care when removing the airbag and be mindful of the airbag clock spring.


You can test each door switch with a PST2, or PIWIS tester or an ohm meter (out of the circuit). Either way the door panel has to come off for the final repair.

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