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Old 06-26-2008, 03:24 AM   #2
ccfj1
Registered User
 
Join Date: Jan 2007
Location: UK
Posts: 112
My Ride: 2003 M3
You can do it the way you suggest, by using the OEM input for the phone, I'm not 100% sure it will work because if you go that way the OEM HU will also expect to see the "tel-on" signal wire as well as "mute", you can try, here is the pinouts for both type of interfaces

Old 17 round pin


So use plug A (x13321)
Pin 3 Phone in -
Pin 8 Phone in +

40 pin quadlock


So use plug C (x13649)
Pin 6 Phone in -
Pin 12 Phone in +

As you can see the phone input for both these types of interface are on the smaller connector located at the base of the plug.

you will also need the correct pin terminal for the dealers, here is the BMW part # 61.13.0.006.663, you need 2; (you may need to use a dremel to shave a little of the edge of the pin).

Personally, I'd get a cheap telemute lead from eBay and use that.

Good luck
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53, M3, Silver Grey. Reto-fits: Modded Mk4 DVD, OEM Bluetooth, VR Control, Rainbow/Alpine Speakers, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.
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