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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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Old 12-07-2012, 08:24 AM
JoshBosh JoshBosh is offline
Registered User
Location: Arlingotn, VA
Join Date: Jul 2007
Posts: 28
Mein Auto: 1994 BM
Problem with aftermarket head unit

I bought my 2002 BMW 325ci with an aftermarket Pioneer head unit already installed but no steering wheel control module. I decided to install one myself. Got everything hooked up with the battery disconnected, reconnected the battery, programmed the SWC unit, and everything worked great.

Then I made a mistake. I forgot to disconnect the battery before pushing the wiring harness and head unit back into its slot. As I was doing so, I heard some odd noises and then the sound cut off. Head unit was still getting power, just mo sound. I kicked myself for not disconnecting the battery and proceeded to check all fuses. No blown fuses in the glove box or on the head unit.

After checking fuses, I tried to turn it back on and now there is no power to the head unit.

Fuses 7 and 41 are good, tried switching with others.

Please help. Did I fry something? Hidden fuse somewhere?

Help is much appreciated.
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