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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > AUDIO/VIDEO + BLUETOOTH + Electronics/Alarm/Software > Factory 8"s not working after aftermarket sub/amp install?



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      03-21-2011, 11:38 PM   #1
Eric the Ricer
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Factory 8"s not working after aftermarket sub/amp install?

07 335i E90 with L7

Hey all, I've been cursing the past 4 hours during my install. Couldn't find a damn remote trigger anywhere in the area, but I went ahead with the install any way. Here are my problems:

Used a LOC and tapped in to the factory 8's under the seat. I noticed immediately after install that when music is playing, I'm getting no sound to my underseat subs. I unplugged the RCA's from my amp to ensure this.

Also, when I have both (+) and (-) RCA's from the LOC plugged in to the amp, I get a totally screwed signal. When I just have one plugged in, it sounds about right. I definitely need to tune.

Now I'm going to run outside to pull my remote wire, because I read on here that if I tap it to the factory amp power wire, it will turn off after 5 minutes, or 1 minute after locking the car. This isn't the case for me. So I'm ordering a low voltage remote trigger now.

Any thoughts on the problems above? I've done all my installs on previous cars, and never stumbled on something like this. Thanks in advance!

-Eric
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      03-21-2011, 11:38 PM   #2
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Also, meant to add, the amp is an Alpine MRP-m500.
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      03-22-2011, 12:00 AM   #3
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Meh, just ordered a PAC LOC and remote trigger, since I already have all of the needed wires t-tapped, I'll just wait for this to come in and go back through the install nice and slow. Should've waited in the first place.
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      03-22-2011, 12:05 AM   #4
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The rem lead is pin 13 at the back of all oem HUs.

You probably tapped the wires incorrectly.....if the subs work after uninstalling everything, then it's your installation.
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      03-22-2011, 12:07 AM   #5
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I t-tapped:

SUB LEFT
Red/White +
Brown/Yellow -

SUB RIGHT
Red/Blue +
Brown/White -

As for the oem REM, I'd rather just use the remote trigger at this point, seems like too much hassle for one wire when I could just drop $20 and make it much, much easier.
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      03-22-2011, 07:31 AM   #6
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You should have gotten Technic's harness...
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      03-22-2011, 10:32 AM   #7
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Quote:
Originally Posted by kaigoss69 View Post
You should have gotten Technic's harness...
Hindsight is 20/20.
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      03-22-2011, 02:25 PM   #8
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Disregard this thread, I'm an idiot.
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      01-14-2012, 12:34 AM   #9
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Just curious, what was the issue?
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      01-14-2012, 01:44 PM   #10
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Quote:
Originally Posted by Eric the Ricer View Post
Disregard this thread, I'm an idiot.
Apparently it was a short circuit just aft of the steering wheel...
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      02-16-2012, 08:48 PM   #11
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Quote:
Originally Posted by VP Electricity View Post
Apparently it was a short circuit just aft of the steering wheel...
Nice

I can't really remember what the problem was, but it was on me, not the car. Now I'm tapped in to the cig lighter for my remote, and I haven't had a problem since.
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