CSL Bumper Wiring DIY from E46 M3 wiring

NZ_M3 · 15-03-2019, 04:50 AM

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

So you start off with this

insulation removed

left side fog light plus wiring and horn wiring up close

Chopping time (first the horn)

then the left side fog light plug

Terminate the ends

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)

Left side done

join the horn plugs like so

Chop the right side fog light plug and join to horn
Crimping

Sealing

Right side done

Before insulation tape goes on

Insulated and compared to a Genuine CSL bumper harness (on the left)

Up close (Genuine CSL on the left)

select · 15-03-2019, 09:55 PM

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

0-60Motorsports · 15-03-2019, 10:44 PM

Nice DIY.Thanks for posting this.

M3TZ · 16-03-2019, 03:45 AM

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.

**shimmy** · 17-03-2019, 10:53 AM

Quote:

Originally Posted by M3TZ

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

15-03-2019, 04:50 AM	#1
NZ_M3 S5, Sport On, DSC M-track Join Date: Jun 2008 Location: Auckland, New Zealand Posts: 1,434 Casino cash: $13579	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 So you start off with this insulation removed left side fog light plus wiring and horn wiring up close Chopping time (first the horn) then the left side fog light plug Terminate the ends 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) Left side done join the horn plugs like so Chop the right side fog light plug and join to horn Crimping Sealing Right side done Before insulation tape goes on Insulated and compared to a Genuine CSL bumper harness (on the left) Up close (Genuine CSL on the left) Last edited by NZ_M3; 15-03-2019 at 05:13 AM.

15-03-2019, 09:55 PM	#2
select S5 - Full Throttle Join Date: Oct 2014 Location: Germany Posts: 475 Casino cash: $6813	Nice writeup, thanks for your efforts. Might come in handy some day.. which i hope not, of course __________________ Greetings, Julian.

15-03-2019, 10:44 PM	#3
0-60Motorsports S5 - Full Throttle Join Date: Aug 2008 Location: Kingdom of Bahrain Posts: 481 Casino cash: $3271	Nice DIY.Thanks for posting this. __________________ EURO 04 M3 Current Mods: GC Coilovers, Eibach Sways, RE RCA?s, VCSL Bumper, OE CSL Boot, VCSL CF Rear Diffusor, DIETZ TV in Motion, SS Stepped Headers and catless, SS Res X Pipe, SS Race exhaust, OEM CSL Steering + interior, OEM CSL Intake, MSS54HP with HTE Tune, BBS CH's/LM?s FX-R Projectors + night breakers, STOPTECH ST60/40, RE Front strut brace, DINAN Rear Strut Brace,

16-03-2019, 03:45 AM	#4
M3TZ Wonky 'L' after Washing Join Date: Sep 2017 Posts: 6 Casino cash: $3769	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.