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Old 07-12-2002, 11:03 PM
Registered User
Join Date: Nov 2000
Posts: 37
Nokia carkit wiring and antenna question

Since I bought the car used, I don't know how and where the Nokia carkit is wired. It was on the car already. It fits my phone and it's great to use the microphone, handsfree, but here's the problem. As soon as the phone is in the holder, it switches to receive signal from the external antenna but the reception drops dramatically when this happens. I have been avoiding the carkit for this reception.

There should be the Nokia control box somewhere, but where is it usually installed (how long are the wires to the phone holder?) Could be behind the radio, in there somewhere but I have yet to remove the pass. carpet to find out.

An aftermarket cellular antenna is mounted to the rear window but the car has a Hirschmann am/fm/cell antenna, can I use that instead.

Also, I would like to connect the radio muting function, is there a special adapter for it?

I need so ideas as to what should be there and how to re-install the system for better function and reception. Thanks for the hlep, Chris

Chris Doko
93 500SEL
-Clear Corners
-Apine CD changer
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Old 07-13-2002, 08:26 PM
Michael's Avatar
Join Date: Jul 1999
Location: Boston, USA
Posts: 2,700
The antenna of a Nokia car kit will connect right up to your antenna, but you're likely gonna need an adapter (is the same one install places use for VWs)

As to the radio mute, it can assuredly be done, but you'll need to figure out if your Nokia is looking for 12V, or if it's looking for when the 12V signal goes away (usually the former). That established, you need to look for the complementary signal from he back of the head unit. First, though, pull your radio/ashtray; you may get lucky and find a labeled "telephone" lead (as I did with my '92 300D), which I simply connected to the radio mute wire of the Nokia. Job done.

In this case, as long as the radio is on and it gets interrupted when you make a call, the antenna will stay up

As to where the box is installed, follow the you can do to nsure it was done right to begin with
"If God had meant for us to walk, why did he give us feet that fit car pedals?" Sir Sterling Moss

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Old 07-14-2002, 12:07 AM
La Jolla Audio
Join Date: Dec 2001
Location: San Diego California
Posts: 996
The most common place for the box is either under the passengers side front carpet or under the pass front foot rest. To access it take the pass door threshold trim out by pulling straight up then the whole carpet section will come out in one piece.This should expose the module and make it easier to trace the problem and re wire. By the way did you remove the rubber antenna connector cover on your phone?
The phone mute wire on nokias is a ground and will directly connect to the yellow black wire on the back of the becker radio. Let me know if you have any more questions.

The Mercedes Specialists Since 1986
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Old 08-02-2002, 02:33 PM
Registered User
Join Date: Nov 2000
Posts: 37
Thanks for the replies. I'll take a look this weekend. And the rubber cover on the phone is off. Actually, when I place the phone in the holder the reception drops off completely. I figuered out that the phone turns off it's internal antenna when the carkit plug makes contact with the phone port.

It could also be an antenna for a different frequency. Here, AT&T Wireless uses the 800-900 Mhz band. Anyone know if the Hirschmann will cover this frequency?

Chris Doko
93 500SEL
-Clear Corners
-Apine CD changer
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