TECH HELP EDITOR
Base vehicle expert
Q Why has the horn stopped working on my Peugeot-based campervan?
I have a 2017 Auto-Sleeper Warwick Duo on a Peugeot Boxer. The horn has stopped working and I'm at a loss as to why.
I've checked the following:
• Fuses – all tested and OK
• Relay – I've tested the relay by swapping with the one next to it, and it works OK. I've also shorted out the contact point from the relay and this sounds the horn, so I know the power wiring is OK. However, when I press the horn switch on the steering wheel the relay does not activate
• Steering wheel – I've taken the centre off the wheel and tested the contacts from the horn activation, and all four are good.
So, I don't know what to test next. It would seem that the signal from the centre press in the steering wheel is not getting to the relay, what I'm unsure of is whether this signal goes directly (by a wire) to the relay; or if it goes into the CAN bus and something clever then activates the relay. And then how to test either way.
Any help would be much appreciated.
Mark Edwards
A You seem to have ruled out everything but the clock spring (this transmits signals from the steering wheel controls while enabling the steering wheel to rotate) and the connectors from the steering wheel module to the main loom.
Your next course of action would be to remove the lower and possibly the upper cowling around the steering column and locate the electrical connectors. Unplug these, clean them with an electrical contact cleaner and reassemble.
If this does not work, check for continuity between the horn cable and the horn push and, if this is not present, the only remaining item would be the clock spring. I am sure that you are aware of the safety procedures regarding working anywhere near airbags,
