bluetooth works

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   Just wanted to let everyone know that I have successfully retrofitted the BMW bluetooth kit part number 84 64 0 302 161 for a E39/touring to my 99 740i. 

It is very simple but there are a few notable changes you need do to make it work. Firtsly I had a factory fitted phone kit so I did not need any of the power wiring looms, I only needed the bluetooth wiring loom. This can all be connected as in the installation inscructions, the only place where the whole new BT wiring loom needs connect into the car is at the white 12 pin X400 plug. You actually get a new top part of this plug as part of the new loom as the top part of the X400 plug that was in my car was connected to the old phone loom. 
The good news is that the hands free mike has a 3 pin plug in the boot, so you can just disconnect the plug here from the old loom and plug in the new plug from the BT loom (no need to rip out all your headlining to install a new hands free mike!!!) 

NOW FOR THE IMPORTANT BIT... The new BT loom installation instructions says you need to connect 4 wires to the radio unit (2 separate wires for tel mute and tel on and two wires into a plug to connect into the radio (these are for speaker +/-). The problem is that the radio in the E38 does not have all these connections. The two wires for Tel mute (brown/white) and Tel on (green/white) can be connected into the top of the new X400 plug in to the same pins as the brown/white and green/white wires already in the plug. (ie you should have two brown/white and two green/white wires in top of the new part of the X400 plug. 

From the bottom of the X400 plug remove the current black/brown and black/white wires these are the speaker +/- wires that go to the front speakers, plug in the wires from the new wiring loom into these now empty sockets as shown on the installation instructions. What you should now be left with is 4 wires. The two wires that you removed from the bottom of the X400 plug and two wires connected into a small black plug that should go into the new generation radio. 
Here's the trick the bluetooth audio signal NEEDs to be amplified, the old factory phones motorola/nokia etc does not. You need to cut off the small black plug and install a small preamp (search on google for ELK-800, this is perfect for the job) in between these two wires from the new loom and the two wires that you removed from the bottom of your X400 plug. After this it all works perfectly.!!! 
Because BMW does not supply this pre amp that is needed this is why they say it cannot be done. 

Sorry if this is unclear but it is difficult to explain with out showing the diagram from the installation instrcutions. 

Anyhow I am totally happy as I have an E38 1999 740i with bluetooth fully fucntional with my steering wheel controls, voice activation and all my phone book numbers from my phone etc on my NAV display, just as it should be.!! 

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JackTL Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 15-February-2004 Status: Offline Points: 17	Topic: bluetooth works Posted: 11-March-2004 at 15:08
	Just wanted to let everyone know that I have successfully retrofitted the BMW bluetooth kit part number 84 64 0 302 161 for a E39/touring to my 99 740i. It is very simple but there are a few notable changes you need do to make it work. Firtsly I had a factory fitted phone kit so I did not need any of the power wiring looms, I only needed the bluetooth wiring loom. This can all be connected as in the installation inscructions, the only place where the whole new BT wiring loom needs connect into the car is at the white 12 pin X400 plug. You actually get a new top part of this plug as part of the new loom as the top part of the X400 plug that was in my car was connected to the old phone loom. The good news is that the hands free mike has a 3 pin plug in the boot, so you can just disconnect the plug here from the old loom and plug in the new plug from the BT loom (no need to rip out all your headlining to install a new hands free mike!!!) NOW FOR THE IMPORTANT BIT... The new BT loom installation instructions says you need to connect 4 wires to the radio unit (2 separate wires for tel mute and tel on and two wires into a plug to connect into the radio (these are for speaker +/-). The problem is that the radio in the E38 does not have all these connections. The two wires for Tel mute (brown/white) and Tel on (green/white) can be connected into the top of the new X400 plug in to the same pins as the brown/white and green/white wires already in the plug. (ie you should have two brown/white and two green/white wires in top of the new part of the X400 plug. From the bottom of the X400 plug remove the current black/brown and black/white wires these are the speaker +/- wires that go to the front speakers, plug in the wires from the new wiring loom into these now empty sockets as shown on the installation instructions. What you should now be left with is 4 wires. The two wires that you removed from the bottom of the X400 plug and two wires connected into a small black plug that should go into the new generation radio. Here's the trick the bluetooth audio signal NEEDs to be amplified, the old factory phones motorola/nokia etc does not. You need to cut off the small black plug and install a small preamp (search on google for ELK-800, this is perfect for the job) in between these two wires from the new loom and the two wires that you removed from the bottom of your X400 plug. After this it all works perfectly.!!! Because BMW does not supply this pre amp that is needed this is why they say it cannot be done. Sorry if this is unclear but it is difficult to explain with out showing the diagram from the installation instrcutions. Anyhow I am totally happy as I have an E38 1999 740i with bluetooth fully fucntional with my steering wheel controls, voice activation and all my phone book numbers from my phone etc on my NAV display, just as it should be.!!

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