e46 325i HU turns itself off after 20 min

Hi,
I recently purchased a used 2003 325i and I think someone has wired the HU and ipod interface incorrectly. This is the factory HU and BMW ipod adapter. There are 2 main symptoms.
1. HU turns itself off after 20 min while driving. I can turn it right back on and it picks up where it left off. It doesn't matter which mode is selected; it turns off every time.
2. The HU does not turn off with the ignition.
Does someone have a proper wiring diagram or ipod adapter install instructions that I can reference?
Thanks

Originally Posted by max.lamers

Hi,
I recently purchased a used 2003 325i and I think someone has wired the HU and ipod interface incorrectly. This is the factory HU and BMW ipod adapter. There are 2 main symptoms.
1. HU turns itself off after 20 min while driving. I can turn it right back on and it picks up where it left off. It doesn't matter which mode is selected; it turns off every time.
2. The HU does not turn off with the ignition.
Does someone have a proper wiring diagram or ipod adapter install instructions that I can reference?
Thanks

It seems to me that the ACC line into that OEM HU has been replaced by a constant 12V line... that will explain the 20 minute shut off (that's a feature and not a fault, you can play the radio without a key for those 20 minutes), and why the HU does not turn off with ignition: http://www.bimmerboard.com/forums/posts/26961

I would pay attention to the way pin 5, the ACC line in your OEM main radio harness is connected to the OEM iPod adapter.

Turns out that a fuse was blown that recognized whether the car had the key in the ignition. It was working like the car was off at all times.

Originally Posted by max.lamers

Turns out that a fuse was blown that recognized whether the car had the key in the ignition. It was working like the car was off at all times.

What fuse # would that be?

edit: N/M is fuse 7.... if fuse 7 is out the radio wil be turning off every 20 min. and it won't shut off when you turn the car off