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Old Sun, Sep-30-2018, 06:44:13 AM   #1
terraphantm
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Default Software Fix for Alternator Light on 2004.5+ Cars Running The CSL Program

As some of you may know, March 2004 and newer M3s use the CAN-bus to trigger the alternator light when the voltage gets low rather than using a direct wire to the cluster like earlier M3s. The CSL was out of production by this point, so BMW never made a variant of the CSL program that can trigger the alternator light over the CAN-bus. The code isn't present at all - it wasn't something simply turned off. Up until now, the only way to retain a functional alternator light was to add the wire that earlier M3s had and to recode the cluster to look for the wire instead of the CAN-bus.

Today I was working on a car that didn't have the wire retrofitted. Since I was feeling too lazy to spend 15 minutes adding a wire, I decided to spend a couple hours disassembling some binaries and writing some code

So here's the binaries I made (drop the ".pdf" from the filename to extract the archive). Inside the archive you will find an 3 0pa/binary pairs. The 211325 files are for DMEs running the real CSL bootloader, while the 211323 file a variant built for the non-CSL bootloader. The 0301/0401 at the end of the file refers to the program version. Most of you should be on 0401 (and in fact I didn't even bother making non-CSL version of the 0301 program)

The 0PA files can be flashed with WinKFP in expert mode. The bin files can be flashed with MSSFlasher (note - the bin files do not contain a data section). End result should be identical regardless.

General steps would be:
1) Backup your tune and program
2) Flash the modified program that's appropriate for your setup
3) Modify your tune by writing "01 05 0A" at 0x5968
4) Using NCS Expert, make sure "GENERATOR_UEBER_CAN" is set to aktiv

You should now have a functional alternator light in CAN mode. I haven't tested this with an actual failing alternator, but the battery light is on with the engine off and off with the engine running. The code is pretty much lifted directly from the non-CSL HP software, so it should be fine.
Attached Files
File Type: pdf CSL_can_alternator.7z.pdf (352.5 KB, 52 views)

Last edited by terraphantm; Sun, Sep-30-2018 at 01:56:12 PM.
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Old Sun, Sep-30-2018, 08:23:38 AM   #2
Qix
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Default Re: Software Fix for Alternator Light on 2004.5+ Cars Running The CSL Program

I have an end 2003 so I should have the good old wire, but thanks anyway for sharing this!
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Old Wed, Oct-03-2018, 07:24:44 AM   #3
jozy
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Default Re: Software Fix for Alternator Light on 2004.5+ Cars Running The CSL Program

hail to terra still taking care of the community
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Old Sat, Jan-26-2019, 10:27:34 PM   #4
exodus454
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Default Re: Software Fix for Alternator Light on 2004.5+ Cars Running The CSL Program

My alternator just died with alternator over CAN enabled, can confirm battery light functions correctly
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Old Sat, Jan-26-2019, 10:36:03 PM   #5
terraphantm
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Default Re: Software Fix for Alternator Light on 2004.5+ Cars Running The CSL Program

Cool, thanks for the confirmation!
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Old Thu, Jun-20-2019, 05:13:14 PM   #6
jbfrancis3
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Default Re: Software Fix for Alternator Light on 2004.5+ Cars Running The CSL Program

Great write-up with background and solution, thanks Terra.
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Old Fri, Jan-03-2020, 08:00:35 AM   #7
Jk715
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Default Re: Software Fix for Alternator Light on 2004.5+ Cars Running The CSL Program

Can someone repost the file?
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Discussing Software Fix for Alternator Light on 2004.5+ Cars Running The CSL Program in the Coding and Tuning Forum - Discuss all avenues of coding and tuning here! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)