Pop Port Ignition sense pin

Question

I have a BMW installed car kit for a Nokia 6230i, however I cannot get the ignition sense to work. I have enabled this in the nokia menu.
when I look at the carkit the only pins connected to the pop port are;
1- Vin
2 - Gnd
9 - mic-
10 - mic+
Please can someone explain what pin should be connected to enable ignition sense and what voltage should be applied Vcc or GND? If I can find out I will be able to modify the BMW part.
I have looked up the pin out of the pop port but can't tell how the ignition sense works.
1 - Vin - Charger input
2- GND - Charger output
3 - ACI - Auto-connect Ignition
4 - Vout -
5 - USB Vbus - Also act as USB power detection?
6 - Fbus Rx/USB D+
8 - GND - Data GND (Logic)
9 - VMic- - Audio IN - Ext. Mic input negative
10 - VMic+ - Audio IN - Ext. Mic input positive
11 - Hs Ear L- - Audio Out - Ext. audio out: left-negative
12 - Hs Ear L+ - Audio Out - Ext. audio out: left-positive
13 - Hs Ear R- - Audio Out - Ext. audio out: right-negative
14 - Hs Ear R+ - Audio Out - Ext. audio out: right-positive
* - GND - Shield GND in cavities
Thanks for your help..

Answer 1

It helps to understand the whole IGNS system.
If you set the ignition on in the phone´s menu it only means that the phone will sense the ignition status of the carkit and act accordingly, e.g. automatically switch off if the carkit feels ignition off and phone in idle etc.
So far so good.
The phone knows the ignition status of the carkit over ACI message. So this to connet is a must.
But - big question is what kind of BMW carkit you have and if this one is able to read and interprete ACI messages as this ACI is a proprietary interface and only Nokia carkits use it as far as I know.
Any more information available ?