Hi guys. I have a very strange problem with my s60 2005. While I drive with locked doors sometimes few of the car`s buttons are not functioning. Sat nav controls on the steering wheel, central locking button, rear head rest release button and parking sensors as well. This comes and goes when I drive over a bump. Also when this happens and I stop the car, rear light are on and I can`t open the boot without using key. Once the boot is open I have to slam it few times to make all work again. I went to Volvo they couldn`t make it happen and they seemed totally uninterested from what I was saying. Any ideas anyone? How are all these problems connected? Any help is appreciated.

 

These problems are all on the vehicles low speed network. But without the problem showing up consistantly you're chasing a ghost. Could be anything from a bad module to shorted wiring.

 

Being it only happens when you hit bumps, it has to be a loose ground. Unfortunately, it is not going to be easy to find the source of the short.