CSL Bumper Wiring DIY from E46 M3 wiring
 

Some maybe aware, but the CSL front bumper wiring loom is NLA

So I've decided to look into how easy it is to turn the stock E46 M3 wiring into a CSL one. Turns out pretty bloody easy, so I've decided to make a DIY in case anyone needs to fashion one up in the future.

The reason you'd want to do this is because the CSL wiring lacks the fog light plugs and also the horn plugs are on the right hand side not left hand side like the stock M3.

BMW uses Raychem branded heat shrink and specifically the inner resin coated type - I've used the exact same type except in black for my wiring DIY.


First find yourself an E46 M3 bumper wiring. As you will see it has two fog light plugs in grey and the horn plugs are on the left side (near the main round plug).

Steps:
1. Cut horn plugs
2. Cut fog light plug on left side (terminate the wiring for this +ve wire)
3. Terminate all cut wires
4. Join the yellow +ve wire from the right hand side fog light plug to the purple +ve for the horn on the left hand side
5. Cut the fog light plug on the right side
6. Connect the horn wires together and crimp onto existing right side fog light wiring.
7. Tidy up wiring and admire your work :hahaha:

So you start off with this
https://i115.photobucket.com/albums/...ps5cjgvor2.jpg

insulation removed
http://i115.photobucket.com/albums/n...pshvklhdqq.jpg

left side fog light plus wiring and horn wiring up close
http://i115.photobucket.com/albums/n...psrswsn1lu.jpg

Chopping time (first the horn)
http://i115.photobucket.com/albums/n...psfs2eweqc.jpg
then the left side fog light plug
http://i115.photobucket.com/albums/n...pso6kmp51d.jpg

Terminate the ends
http://i115.photobucket.com/albums/n...psslamqo3u.jpg

Join the cut yellow wire which feeds the right side Fog light +ve and join it to the horn plug +ve (purple wire) on the left side (I used crimping, but forgot to take a photo - crimp is the recommended wire repair method by BMW)
http://i115.photobucket.com/albums/n...pskkxvwoje.jpg

Left side done
http://i115.photobucket.com/albums/n...pshm7kunbo.jpg
http://i115.photobucket.com/albums/n...psivkizo83.jpg

join the horn plugs like so
http://i115.photobucket.com/albums/n...psw5hvawwq.jpg

Chop the right side fog light plug and join to horn
Crimping
http://i115.photobucket.com/albums/n...ps6le5xek3.jpg
http://i115.photobucket.com/albums/n...psqwnsi5hp.jpg

Sealing
http://i115.photobucket.com/albums/n...pslln9couk.jpg


Right side done
http://i115.photobucket.com/albums/n...ps92f58t23.jpg

Before insulation tape goes on
http://i115.photobucket.com/albums/n...psrrpnzfd5.jpg

Insulated and compared to a Genuine CSL bumper harness (on the left)
http://i115.photobucket.com/albums/n...psxzwhw0qh.jpg

Up close (Genuine CSL on the left)
http://i115.photobucket.com/albums/n...psjpwlqqmc.jpg
http://i115.photobucket.com/albums/n...psfuwmnnfu.jpg

Nice writeup, thanks for your efforts.
Might come in handy some day.. which i hope not, of course :hahaha:

Nice DIY.Thanks for posting this.

Good timing as it's just about time for me to install the OEM CSL bumper and I was wondering how to tell the shop to lengthen the horn wires.

Would you believe it :)