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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 12-07-2012, 11:26 AM   #1
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Join Date: Nov 2012
Location: Arlington, VA
Posts: 15
My Ride: 2002 BMW 325ci
Aftermarket head unit install problems

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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Old 12-07-2012, 12:14 PM   #2
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Join Date: Sep 2012
Location: Old Greg's Cavern
Posts: 12,650
My Ride: '13 128i, '04 330Ci
You probably lost a pin from one of the connectors behind the unit. I bet one got dislodged. Take it out and inspect the connectors.
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Old 12-07-2012, 05:55 PM   #3
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Join Date: Nov 2012
Location: Arlington, VA
Posts: 15
My Ride: 2002 BMW 325ci
So turns out it was just the battery dying since the interior lights were on during the install. Jumped it and it works fine. Looks like the BMW turns off speaker volume when the battery gets low.
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