I fitted a new Pioneer AVID F940BT this morning to my 2003 Cayenne S.

So I was 'messing' behind the PCM and also behind the glove box ...

I now have PSM Failure Workshop message.

Am I barking up the wrong tree by thinking the new headunit work and the PSM message are related?

Only thing I can think of is maybe the PSM switch above the PCM has been knocked.

But if I need to look somewhere else rather than the headunit work, please let me know!

Peter