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Retrofit OEM Bluetooth to car with fixed handset

If you already have the motorola handset installed but want to change it to the newer bluetooth unit, this is the page for you. the microphone and prereqs are already in place.

 

Pre-requisites

When you purchase your Bluetooth module check to see if the following parts are already in the kit.

 

you will require a new connector block, PN - 4E0 972 144

Bluetooth antenna 8P0-035-503-E

 

Bluetooth Modules

4E1 862 335 (with rsap) for MMI 2G

4F1 910 336 C

 

fitting locations

Bluetooth Unit - under drivers seat

 

Procedure
The unit is located under the drivers seat, you will need to unbolt the seat but not completely remove it, - see here for seat removal coming soon -

 

Remove the plastic trim along the kick plate next to the door. This just lifts up then pulls up and towards the back of the car.

Unclip the seat's power cable from the guide at the bottom of the seat.

Peal back the carpet just forward from the air vent under the seat, it's split at that point already, .Then lift the carpet from the door side.

Unclip the seat's power cord from the holder under the carpet and push the carpet back towards the central column

the Car Kit is in the box to the far left nearest the door hinges, open it and disconnect all the cables.

 

Take your new connector block (4E0 972 144), you now need to remove some of the pins from the original block in to the new block, take out the following pins from the old and place them in to the new

Leave any pins not named below in the old connector

 

OLD	NEW	Desc.
33	14	Diagnostics
42	11	MIC +
41	12	MIC -
15	10	Terminal 31 (Earth )
16	2	Terminal 31
35	1	Terminal 30 (+12V)

 

Connect the BT aerial, the MOST loop, and the 54 pin socket (your new connection block will fit)

 

You can now test if it works

 

Then refit all the parts in reverse order.

 

You may need to update your MMI firmware, and use VCDS to recode.

 

A -	Multi-pin connector, 54-pin, black

B -	Connection (yellow) for aerial for Bluetooth

C -

MOST bus

 

 

54 Pin terminals (for reference)

 

1 -	Terminal 30

2 -	Terminal 31

3 -	Mobile phone “ON” signal to aerial amplifier for mobile telephone -R86-

11 -	Microphone input (+) from microphone unit in front roof module -R164- (telephone microphone -R38-)

12 -	Microphone input (–) from microphone unit in front roof module -R164- (telephone microphone -R38-)

14 -	Open circuit diagnostic lead

37 -	Terminal 30 to telephone bracket -R126-

39 -	Terminal 31 to telephone bracket -R126-

41 -	Terminal 30 to telephone bracket -R126-

42 -	Microphone output (+) to telephone bracket -R126-

43 -	Microphone output (–) to telephone bracket -R126-

44 -	Terminal 31 (screen earth)

45 -	NF (+) (low frequency) from telephone bracket -R126-

46 -	NF (–) (low frequency) from telephone bracket -R126-

47 -	SNDREQ signal from telephone bracket -R126-

49 -	Ser-Tx (+) to telephone bracket -R126-

50 -	Ser-Tx (–) to telephone bracket -R126-

51 -	Ser-Rx (+) from telephone bracket -R126-

52 -	Ser-Rx (–) from telephone bracket -R126-