Subject: DONE- This is the pin out for 98 or earlier E38 DB25 to ULF56 DIY harness. Author: bmw635 : 15147 posts Posted on: 2008-03-21 18:36:34

I-bus is on on pin 9 of ELOS connector under arm rest and the jumper pin 6&9 (per Martin's doc) is to loop I-bus back to pin 6 of DB25 in trunk. Therefore I-bus is on pin 6 of DB25 (as Lyonsden1980 mentioned) for pre-99 cars as post-99 E38 use pin 22 for I-bus.

This IS the pre-99 E38(3/98 in my case) DIY pin out for DB25 to ULF56 pin.

This is the CORRECT 26 TO 54 PINOUT the ULF

26PIN BLACK CAR PLUG-----------54PIN ULF PLUG

PIN 3-----------PIN 36 KL31 Ground
PIN 4-----------PIN 17 KL30 +
PIN 5-----------PIN 35 KLR Ignition
PIN 10----------PIN 51 Mute
PIN 11----------PIN 32 TXD Pairing
PIN 14----------PIN 19 Mic -
PIN 15----------PIN 1 Mic +
PIN 19----------PIN 37 Speaker +
PIN 20----------PIN 21 Shield
PIN 6-----------PIN 15 I Bus
PIN 25----------PIN 38 Speaker –
PIN 21----------PIN 33 Tel On

• If my 3/98 E38 doesn't have phone but pre-wired and I installed BT, - bmw635 2008-03-19 21:57:59 (248 views)
  • What's the reason for jumping pin 6&9, 11&14 on the ELOS on center arm rest for (url) - bmw635 2008-03-21 15:08:15 (156 views)
    • I'll bet I-Bus loop-back is the reason! (nt) - Brian 2008-03-21 15:26:38 (134 views)
      • Sure is. It's DONE.Thx Lyonsden1980, Brian. (nt) - bmw635 2008-03-21 18:42:13 (122 views)
  • Peter the ibus is on pin 6 of the db25!! (nt) - Lyonsden1980 2008-03-20 17:15:37 (129 views)
    • DONE- This is the pin out for 98 or earlier E38 DB25 to ULF56 DIY harness. - bmw635 2008-03-21 18:36:34 (219 views)
  • Do I need to discon batt to detect the BT/ ULF? TIA. (nt) - bmw635 2008-03-20 02:47:17 (117 views)
    • I didn't disconnect the battery but it's good practice. (nt) - pd750 2008-03-20 16:10:07 (146 views)
  • Yes, you should get the ''Telephone'' option on your nav screen - Brian 2008-03-19 22:41:53 (137 views)
    • Is the I-bus in the DB 25 to 52(ULF) or in the 18pin ELOS in ceter console? I - bmw635 2008-03-19 22:54:43 (141 views)
      • I-Bus is on the DB25 to 52-pin ULF (nt) - Brian 2008-03-19 23:05:36 (143 views)
        • Doohh- DIY the harness and didn't remember. OK, DB25 doesn't have I-bus signal? (url) - bmw635 2008-03-19 23:43:01 (145 views)
          • I bought one of Martin's kits, so I do not know the DB25-to-ULF conversion (url) - Brian 2008-03-20 06:51:03 (169 views)
            • Could the NAV retrofit moved the I-bus from the original harness onto the NAV - bmw635 2008-03-20 11:11:20 (145 views)
              • I don't think so. You could try temporarily wiring a bridge - Brian 2008-03-20 11:44:56 (129 views)
                • I am missing the I-bus to DB25! Jump I-bus from NAV to ULF and it works. - bmw635 2008-03-20 16:05:48 (160 views)
                  • I assume that all the phones work over the I-Bus - Brian 2008-03-20 17:23:39 (104 views)
                    • If that's the case the pinout reference I used is wrong. Lyonsden said pin 6 so - bmw635 2008-03-20 17:42:59 (120 views)
                      • There could be small variations based on model year (nt) - Brian 2008-03-20 18:51:42 (124 views)
          • I mean SES jumper, not I-bus jumper. Thx. (nt) - bmw635 2008-03-19 23:47:05 (120 views)
            • Voice command is working for phone and NAV but no display still. (nt) - bmw635 2008-03-19 23:53:53 (121 views)