Subject: Problems installing TCU bluetooth module in 2004 E46 Author: dmw650 : member since May, 2009 : 1 post Posted on: 2009-05-13 01:05:56

I am trying to install a bluetooth TCU in my car and it is blowing the #7 fuse. Has anyone seen this before?

The car:
2004 325cic convertible built in July 2003.
No Assist previously installed
Pre-wired for a phone

The parts:
Bluetooth/Assist TCU & antenna from a 2006 330cic (convertible)
TCU part number 84 10 9120843-01
New microphone

This link has detailed instructions: . My car looks just like the pictures in the link.

I wasn't quite sure which antenna wire went where. My first try was the cream wire on the cream connector.



The physical part of the install went well. But when I reconnected the battery something wasn't quite right with the radio and it didn't notice the module installed. Fuse #7 was blown. I disconnected the TCU, replaced the fuse and everything was back to normal. Thinking the antenna could be messing things up I disconnected the antenna, reconnected the TCU, reconnected the battery, and bam, another blown fuse.

The guy I bought the TCU from claimed everything was working when he pulled it out. He removed it before the car was sold.

The obvious choices are:
1) I messed something up, somewhere
2) The TCU is not compatible with my car
3) The TCU is bad

Is there another step that I missed?

Anyone know what's going on? Is there anyway to test the TCU?

Thanks in advance for any help!

• Problems installing TCU bluetooth module in 2004 E46 (pic) - dmw650 2009-05-13 01:05:56 (1608 views)
  • Bluetooth Antennae cable should be purple & cream... - legalfee 2009-06-16 15:26:10 (489 views)
  • from my experience playing with the TCUs they are a bit different - Martin 2009-05-21 23:43:19 (511 views)
    • According to BMW SI B84 13 04, this TCU should work in your car - Brian 2009-05-22 06:53:29 (564 views)
      • Re: According to BMW SI B84 13 04, this TCU should work in your car - mrmcoupe 2009-05-22 07:25:55 (481 views)
        • Update - mrmcoupe 2009-06-16 14:11:14 (484 views)
        • I played with the TCUs before and go back to the ULF as the best for the E38 - Martin 2009-05-30 09:49:51 (457 views)
  • Do you still have the phone cradle/eject box installed? - Brian 2009-05-13 09:26:06 (504 views)
  • That is strange-- according to the parts database, that TCU should fit your car - Brian 2009-05-13 06:46:05 (530 views)
  • Wiring not the same - kiwijochen 2009-05-13 03:34:30 (498 views)