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MG MGF Technical - Handsfree Car Kit
|Ive recently bought a handsfree car kit for my nokia 3310. The problem ive got is i dont know where to connect one wire. The cables on it are :-|
Red = + 12V
Black = 0V
Blue = Book Says do not connect
Yellow = Car Radio Muting (CRM)
Green = Book Says do not connect
Now red and black I can do wonderfully!! lol but where the hell do i connect the yellow wire??? Do i connect it via the on/off lead of the radio or do i need some sort of relay circuit to turn the radio off!
Im really stumped by this one. The manual's wiring diagram is rather poor to say the least!!
I'm not sure about the standard issue radio but on most car audio now you will find a cable coming out of the radio plug harness that is specifically for the muting....
I'm not sure on the factory standard one, perhaps Dieter or one of the other guys might be able to shed some light on the matter
Depends on the radio you have - I don't think the original Philips had 'mute'.
|Ive got a Panasonic Radio but it doesnt have a mute facilitie of it. Ive got a scan of the diagram from the nokia book if anyones intrested!!!!|
As the others have said, check your radio manual. If it is compatible with mobile phones then their will be a connection.
|You have to have a radio which has the muting feature. The yellow wire won't mute any old radio.|
I suspect that Paul Hunt could advise you how to connect the yellow wire so that it mutes all of the cockpit engine and wind noise by switching the ignition off when anyone calls you on the phone :-)
|Thats sounds like a good thang!!|
By the way if you have a microphone to fit, (can't remember what the 3310 H/F kit contains) put it ontop of the steering column, just behind the steering wheel. You can fit it with felcro. You'll still need to shout to be heard though especially if your travelling on a Mway
|Thanks for the tip. Ive uploaded the circuit diagram on the net. goto http://uk.geocities.com/chrisjglen2000/diagram.jpg|
to see it.
Hope this makes things a bit clearer.
|Sorry you will have to copy the link|
Another tip for what its worth. If you're fitting an aerial, I've got one of the tax holder types which means you don't have a problem of where to fit it on the car bodywork and the associated drilling etc
PS: Couldn't get the link to work either way
|DJ if you want a copy of the pic mail me and ill send it to you|
|Chris, The diagram wold work (assuming the line is pulled low when active, not pulled high when active) BUT can the Nokia HF kit pass enough current to throw a relay? because if not then you will fry it. It is most lightly that the system is not designed to pass this much current as it is just a signal, and amplification using a transistor or opto coupler might be in order.|
|Oh and when you say stereo, you mean the Light Green with white stripe wire (ignition switch)|
|Will the nokia book says that the fuse connect to point 86 should be a 200mA fuse and that the yellow wire when the phone rings goes down to 0 volts.|
To quote the book
Yellow Wire - Userd for car radio mutin (XCRM) and is connected to car radio. The line goes down to 0 volts during a call.
Does this help???
You have mail
|Oh if the diagram is from the book... (soory must remember to read!)|
yes you can use this device, but be sure to make certain that the relay does not pull more than 200mA. The wires above (fuse->relay->radio) should be (LGW->relay->LGW) the direction of the connection thru the relay doesn't matter, and there is already a fuse in the wire.
|Why not just buy a new Radio/CD with mute facility if it is that important - you can get one for 100UKP? . |
I have fitted mine in 2 Fs now, Tax disc aerial as mentioned above, and the speaker in the passengers footwell - left hand side, the microphone is velcro-ed next to the Rear view mirror. It works well, although a bit noisey with the top down!! Biggest problem was getting the correct bracket, they wanted be to get one that clipped into the vent, but I wouldn't accept that.
|There is a MGF specific one for the Nokia which fits into the front centre console (next to the passengers knee) without the need for screws. Its very neat and doesn't get in the way. There is a picture on one of the MG sites.|
|The company I work for is getting the local install man in on monday morning to fix a car kit in someones car. He is going to speak to me about this then. Apparently from what he tells me this wire does exacttly what the mute button does on radios that support it. He was saying that I have to connect it near to a relay. I am going to take pics of the whole install so that if anyone wants to know how do it they can!!|
|You can just see mine on the edge of this photo I took of the heater controls. No screws, it fits just under the edge of the console. Don't let them tell you that the bracket is not available like they tried with me, and tried to fob me off with one that fitted over the vent. |
Take the side panel of at the side of the passenger's footwell and the bracket is easier to fit because you can feel it going into place....
|Steve Smith,Maidstone,UK.Most OE MG/Rover (Phillips)units have car cellphone mute connection in the power ISO plug.All the pin needs is a negative command into it,the Nokia HF kit yellow can be connected directly to this terminal.When the phone is in operation the radio will switch off the sound and "TEL MUTE" or similar should appear in the display.Alternatively use a 5 pin relay to interrupt the switched supply ie connect as follows;term 30 and 87a in cut power lead,term 86 swiched power supply(can loop off 30)and finally term 85 yellow wire from car kit.Test by making a call,with radio working you should feel the relay click and the radio will turn off,end the call and the radio will reactivate itself.Hope this helps.Regards Steve.|
This thread was discussed between 13/11/2002 and 19/11/2002
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