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W211 ignition for radio unit

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I’ve purchased an aftermarket head unit but can’t find the ignition wire to wire the unit up properly..... currently both ign and + are on +..... can someone post a diagram please ? I’ve tested every wire at socket from centre dash and nothing seems live with ignition on ???
 
For the trigger +ve feed you'll need to pick it up from the front ciggy lighter,
The usual is for that to got to the HU red,
the permanent +12v in the socket to the HU yellow.
 
Doh I should have thought of that ! Lol thanks !
 
Just whilst I think about it.... the HU only has yellow and black ? This aftermarket unit has red, black, yellow and blue. Obv blue is auto antenna and not used. So I guess yellow to yellow/ black to black for earth and the red to ciggy lighter..... also I will need to get a windscreen mounted electric Ariel as the standard Ariel wire is a different fitting to the one at back of unit, unless there s an adaptor available ?
 
Most MB's already have a screen antenna, integral. Most likely rear screen but Vi's are certainly windscreen, and are suseptable to RF interference from any USB kit.
You would be better sourcing a 'Fakra' adapter from car to HU. Be sure to get your male / female right when ordering. Ebay shouldn't be more than a couple of quids.
The blue (on the HU) wants connecting to the output that provides +ve 12v when the unit is on, blue there is possible too. It powers the antenna amp. If not connected you will suffer poor reception.

Brown (on the motor) will be the -ve, black will be something else. But confirm with a meter.

The canbus isn't usually an issue, on earlier motors at least. Although there is supposedly difference between hi and lo. Even on a 2003 model I would expect the canbus to be available in the motors connector.
 
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I’ve just looked at my front screen and it has the pattern around the screen.... I will look for the fakra adaptor.... so blue needs connecting then, ok. Funny I have no radio reception at all but atleast I know why now lol....
 
I’ve just looked at my front screen and it has the pattern around the screen.... I will look for the fakra adaptor.... so blue needs connecting then, ok. Funny I have no radio reception at all but atleast I know why now lol....
 

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