PDC button sometimes does nothing, but works most of the time
 

Like the title says... since about two weeks, my PDC sometimes just does nothing. The PDC-button doesn't light up and the parking sensors are not engaged. No long beep either, I know for a fact all sensors are working. Then like 10 minutes later when I park the car elsewhere, they *do* suddenly start working when I press the PDC button. I feel like it's a ground issue maybe, the weather is getting colder and more wet over here.

Any idea's? Where should I start looking?

So when it's out of play I doesn't activate with button or reverse gear?

Exactly! And then a little bit later it's working fine, while nothing really changed

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Check PDC module connectors.

https://www.pss-autosoft.net/diagram...s/G_120059.png

Are there any other simultaneous symptoms indicating problem on I-/K-bus communication?

Not that I know of, can you name some examples?

I still have a spare PDC unit back from when I owned a 3.0i E53, which I know for a fact is 100% functional. Are they swappable? The 3.0 was from 2001, my current 4.6 is from 2002

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All those PDC modules are interchangeable if they are the same as rear only or front and rear sensors. And if it's from another E53 no coding needed.

Thanks, will try this somewhere next week when I find some time! So far I can't really seem to find a pattern as to when exactly it does and doesn't work, so it's hard to find the culprit