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  #1  
Old 10-04-2012, 07:39 PM
Antidogma Antidogma is offline
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Location: Richmond, VA
 
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Mein Auto: 2008 328i Sedan
Lost parking sensors after installing aftermarket head unit

Hello:
The other day I had installed an aftermarket head unit to replace the Top HiFi OEM Alpine radio on my 2008 328i (E90).
After reading several posts, I had the OEM head unit relocated to the trunk, and I had several wires run to it, including the High and Low CAN bus.
I then had an additional speaker installed in the empty center channel to take care of the chimes warning for opening the door while ignition key is in, parking brakes and seat belts.
My car is also equipped with rear parking sensors, that I thought go through a different loop. However, I have now realized that I lost the parking sensor beep.
Maybe is something as simple as having to reprogram the car, but I am afraid to have lost them for good.
Does anybody on this clever forum has any info, feedback, suggestion? Thank you.
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  #2  
Old 10-05-2012, 08:26 AM
Antidogma Antidogma is offline
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Location: Richmond, VA
 
Join Date: Jul 2012
Posts: 23
Mein Auto: 2008 328i Sedan
It turns out that the problem was that I did not connect the rear signals from the OEM radio to the central speaker. Now I get the beep but it is way too weak. I will have to find the way of in-line amplifying it.
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  #3  
Old 10-05-2012, 09:03 AM
Technic's Avatar
Technic Technic is offline
Test... 1, 2 ,3
Location: Florida
 
Join Date: Jun 2002
Posts: 4,823
Mein Auto: 2012 M3 - 2014 528i
Quote:
Originally Posted by Antidogma View Post
Hello:
The other day I had installed an aftermarket head unit to replace the Top HiFi OEM Alpine radio on my 2008 328i (E90).
After reading several posts, I had the OEM head unit relocated to the trunk, and I had several wires run to it, including the High and Low CAN bus.
I then had an additional speaker installed in the empty center channel to take care of the chimes warning for opening the door while ignition key is in, parking brakes and seat belts.
My car is also equipped with rear parking sensors, that I thought go through a different loop. However, I have now realized that I lost the parking sensor beep.
Maybe is something as simple as having to reprogram the car, but I am afraid to have lost them for good.
Does anybody on this clever forum has any info, feedback, suggestion? Thank you.
Top HiFi = Logic7
Logic7 = center speaker

If your OEM system is in fact Logic7 then how are you getting rear analog outputs off the OEM Professional radio when the outputs are MOST digital? How that OEM center speaker is not there?

Your system is HiFi, and the rear outputs of the Professional HU are analog, low level, balanced. That's the reason of the low volume... those are not speaker level signals.
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  #4  
Old 10-05-2012, 10:21 AM
Antidogma Antidogma is offline
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Location: Richmond, VA
 
Join Date: Jul 2012
Posts: 23
Mein Auto: 2008 328i Sedan
Sorry about the confusion. My system is HiFi. And you're right, the signals from the OEM radio are now not amplified, but I can still hear the chime. However, even after connecting the rear speakers to the same dedicated central channel for the chimes, the beep from the parking sensor is still very weak.
I am considering the purchase of a small motorcycle amp to boost up the chime/beep signals.
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  #5  
Old 10-05-2012, 10:25 AM
Technic's Avatar
Technic Technic is offline
Test... 1, 2 ,3
Location: Florida
 
Join Date: Jun 2002
Posts: 4,823
Mein Auto: 2012 M3 - 2014 528i
Quote:
Originally Posted by Antidogma View Post
Sorry about the confusion. My system is HiFi. And you're right, the signals from the OEM radio are now not amplified, but I can still hear the chime. However, even after connecting the rear speakers to the same dedicated central channel for the chimes, the beep from the parking sensor is still very weak.
I am considering the purchase of a small motorcycle amp to boost up the chime/beep signals.
As stated before: the aftermarket amp has to accept balanced inputs.
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  #6  
Old 10-05-2012, 12:53 PM
Antidogma Antidogma is offline
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Location: Richmond, VA
 
Join Date: Jul 2012
Posts: 23
Mein Auto: 2008 328i Sedan
I am not running the aftermarket amp for the chimes. The aftermarket amp is connected to the aftermarket head unit.
The OEM radio was relocated to the trunk and I installed an additional speaker in the empty center channel that is dedicated to the CAN BUS coded signals.
But, as you stated, the signal from the OEM radio are low level, balanced signals. I am considering boosting them up with a small dedicated motorcycle amp.
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