Wiring experts: W209 phone

[breeze247]

This is one for the experts...

I have just installed an Android head unit in my 2003 CLK55. Lovely clean install but whilst removing the telephone holder, I caught its wiring harness. As a result, I simply snipped the harness a little higher up the loom from the connector (perhaps 6 inches) to keep things tidy.

One of the things that I now have lingering now is whether or not the harness is actually live. Clearly not good to leave as is if so.

My train of thought:
- If the phone harness takes power from the original Comand 2.0, then I am fine because that is now disconnected.
- If the harness takes power from elsewhere, I do not want a wire that is not properly terminated. I will either find a way of making safe the connection or, better, trace the loom up to a point where I can disconnect it.

Any ideas?

I have a multi-meter but it isn't clear to me which wire will be + and which will be -. If anybody has the wiring diagrams, (and knows how to read them!) that would be great. Failing that, even guidance on colours would be appreciate to help test with the meter.

Thanks in advance...

 

[KillerHERTZ]

Surely you dont need a harness at all if the HU is Bluetooth?

 

[breeze247]

Surely you dont need a harness at all if the HU is Bluetooth?

I definitely don’t need the harness, I just need a way of making safe. Phone cradle etc already removed. If the entire harness is easy to unplug I would be happy to do that.

 

[Diesel Benz]

The cradle is not powered from the head unit but from a phone control unit. Either unplug the harness from the phone control unit end or remove the phone control unit fuse (or both).

 

[breeze247]

The cradle is not powered from the head unit but from a phone control unit. Either unplug the harness from the phone control unit end or remove the phone control unit fuse (or both).

Got it - thank you.

Do you know where the phone control unit would be located on a 2003 CLK?

 

[breeze247]

Just to round this off, the phone control module is in the boot, under the carpet and beneath a plastic covering, between the rear seats and the spare wheel well. The part number was A 2038202585. I removed the module entirely.

Thanks both for your help.