Join Date: Apr 2009
Location: Glasgow, Scotland.
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I went into my local bmw dealer yesterday and asked for some help re. this problem. Very helpful guy at the service centre reception came and checked the car for me. He confirmed the following:
1. No amp fitted in my boot(and no sign of there ever having been one-no wiring running into the boot where it should be and no mounting bracket).
2. No amp anywhere else as the boot location is the only place used(checked the whole damn car anyway).
3. Without an amp connected there would be NO sound output (as i suspected).
4. BMW DID use head units with integrated amps(i was told the amp was always seperate in the boot-NOT SO).
5. Showed me how to remove the head unit and check the din plugs as this is the most likely cause of the fault - loose connections on back of head unit.
I am assured the bmw business head units very rarely fail and they had never heard of one producing the fault i have in this dealer.
Basically there MUST be an amp of some description to produce any output and as the seperate boot unit is not fitted there must be an amp somewhere else. This implies the head unit has the integrated amp as there is NO FECKIN SEPERATE ONE. Unfortunately the guy couldnt confirm this from my registration. He tried on his system but it doesnt tell you which audio system was fitted when the car was built as its an option when the car is ordered by the buyer. We didnt have time to remove the unit but im told the serial number and model number on the head unit will allow the parts people in any dealer (or use REALOEM.COM) to identify exactly which head unit you have fitted and whether or not the amp is integrated.
So to the fix:
we need to remove the head unit and ask a dealer to confirm the amp is integrated in the head unit. Then check all the wiring connections are ok on the back of the head unit (dealer told me there is a little metal clip/bar which fits across the back of the din connectors after they are plugged into there appropriate sockets and fully inserts the connector while securing it). If you still have problems an auto spark is needed to check the unit.
Not tried this yet, but i will update the thread when i do.
Let me know if you get anywhere yourself.
Last edited by WAVEMAN; 04-30-2009 at 04:49 AM.