Subject: Is the 'X400' plug the Bluetooth antenna cable plug? Author: Brian (moderator) : member since January, 2005 : 9007 posts Posted on: 2008-12-09 07:08:52

The BT ULF modules only have two connectors, as you noted: the 54-pin connector and the coax Fakra plug for the Blutooth antenna cable. Your BT setup sounds right.

If you have the DB25 to 54 pin conversion harness, that part is probably done. The slightly more challenging part is the conversion/adapter plugs in the arm rest. This is where the I-Bus loopback is made. However, it can all get a little more complicated with a European-spec car. I think that Euro cars can have different phone pre-wiring from the cars available in the US. That might be part of the challenge.

• Bluetooth install problem - I-BUS loop-back (url) - foxy 2008-12-06 07:41:53 (468 views)
  • SUCCESS !!!!!!! - foxy 2008-12-13 10:28:51 (426 views)
    • Congrats! Enjoy the BT-- it is one of the best upgrades on these cars. (nt) - Brian 2008-12-15 08:53:16 (261 views)
  • So, no ideas how to find the I-BUS pin in DB25 ? (nt) - foxy 2008-12-08 13:56:35 (312 views)
    • Brian, in Martin's doc is mentioned that... - foxy 2008-12-08 18:56:48 (298 views)
      • Is the 'X400' plug the Bluetooth antenna cable plug? - Brian 2008-12-09 07:08:52 (311 views)
        • No, my BT antena is FAKRA, and it fits my ULF. - foxy 2008-12-09 07:28:35 (284 views)
          • In general, you should be able to get the I-Bus signal from anywhere... - Brian 2008-12-09 10:09:48 (271 views)
            • OK, another question. What color is the I-BUS wire... - foxy 2008-12-09 12:12:12 (258 views)
              • Yes, all I-Bus wires are white with a gray stripe and yellow bands (nt) - Brian 2008-12-09 14:58:22 (287 views)
                • But I couldn't find such a wire on my DB25 connector... - foxy 2008-12-09 15:37:25 (290 views)
                  • I-Bus is not on the DB25, that's why you have the loopback on the center console (url) - Brian 2008-12-09 15:59:41 (306 views)
                    • OK, I'll try to connect the I-BUS directly from NAV and... - foxy 2008-12-09 17:58:55 (244 views)
                      • IIRC- I tapped the Ibus from the i-bus CDC pin so the connector and wire wrap - bmw635 2008-12-19 00:57:03 (268 views)
                        • My DB25 has the iBus wire in pin#19 Yellow wire on 95' 740iL (nt) - 95seven40 2009-09-27 02:09:56 (60 views)
    • BMW635 recently sorted this out... Check out his posts on this (url) - Brian 2008-12-08 15:30:05 (299 views)
      • BMW635 ! Where are you ? Need some advise... (nt) - foxy 2008-12-08 18:37:06 (234 views)
        • He is on the e38 board. (nt) - Roy In GA 2008-12-08 23:35:19 (250 views)
          • Guess I missed the party. Glad you got it working. (nt) - bmw635 2008-12-15 13:13:34 (314 views)
      • Not so much info there. - foxy 2008-12-08 15:52:24 (228 views)