Z4 E85 audio wiring

[tchides67]

Hello,
I would like to change the original radio with a modern one on my 2007's Z4 E85 (phase 2).
But of course the wiring of the new radio is generic : I have the description of each wire of the new radio, but not the wiring on the car's side.

Picture of the wiring of the car :


I have the following options :
S662 - Radio BMW Business CD
S672 - Cd Changer Bmw For 6 Cds
S677 - HiFi system Professional DSP
But NOT the screen & nav on the top of the dashboard.

I've searched through the forum but I didn't find a post describing the wiring.
Does anybody have a wiring diagram or a description of what is the use of each cable ?

Thanks !

 

[tchides67]

Hello
So I bought an adapter especially made for E85 models :


But it doesn't work... The new radios powers on correctly at 2nd key position, but I have no sound...
I checked twice the wiring and it's done (the adapter and the new radio have description sticked on each cable).

Has anyone faced the same issue ?

 

[Evklid]

Probably you have DSP or Amplifier which is not powered up with your adapter

 

[smorris_12]

Yep, amp will be the sticking point.

 

[tchides67]

Does anybody know how to power up the amplifier ?

 

[Evklid]

Does anybody know how to power up the amplifier ?

Didn't read your first message carefully
Now I see you have DSP.
As I recall with my E53 back in 2008 it is optical interface between head unit and DSP
No direct connection to speakers. Only option was to replace all BMW parts with custom hu/amplifier

I'm afraid E85 is same

 

[smorris_12]

I've never come across the DSP systems but I've half a mind that there's 2 different amplifiers, one fibre optic, one a bit more traditional. Be worth fetching out block/wiring diagrams of each.

 

[tchides67]

Indeed I have the S677 option, so that should mean that I have an amplifier... I thought the ampli was in the battery box, but I can't see it... well I know I'm old and with very bad eyes, so I show you pictures :


I also took a picture of the wiring on the dashbord, does that look like optical fiber ?

 

[Evklid]

I think it is mounted to firewall behind that carpet
Check this thread

Z

Post in thread 'So where is the infamous DSP audio amp?'

Jun 9, 2023

You are poking around in the left hand side of the boot, right?
Amp is further over to the right. For orientation, the black brackets in your photos are on the far left of this picture here, which is a view of the rear bulkhead from the rear (i.e. looking forward).

• Zedebee

 

[tchides67]

Well done, I found it behind the firewall's carpet :




I did'nt want to remove the carpet because tomorrow the car will go to a professional for a complete detailing so I still do not know if it's the optical fiber version or not.