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Old Wed, Jan-15-2014, 03:57:03 AM   #1
p0lar
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Default 6MT Shift Lights Howto

The E46 M3 is equipped with a sequence of 7 multi-function amber lights that tail the tachometer in a radial pattern from 4500 RPM to 7500 RPM. While the car is warming up, these lights are ordinarily used to indicate engine oil temperature; however, once the oil has reached the monitoring threshold, they become dormant, except on the SMG-equipped cars, where they become shift indicator lights.

The 'shift lights' feature on the E46 M3 was not enabled for manual-transmission cars from the factory, but was enabled for SMG-equipped cars by default. Though it's been explained elsewhere in great detail, this thread is simply the placeholder for the elements required to make the changes for 6MT-equipped cars, as well as a comprehensive list of the shift light location in all MSS54/MSS54HP DME variants.

As usual, the first step is to identify the program version of DME. Once the DME's version has been identified, reference the following table and examine the byte at the proper offset.

VersionDME VariantOffset
211322000701MSS54unavailable
211322000901MSS540x1A01
211322001101MSS540x19FB
211322001301MSS540x1A67
211322001501MSS540x1A7D
211322001701MSS540x1AB3
211322002101MSS540x1AB3
211322002401MSS540x1AB3
211322002601MSS540x1AB3
211322002801MSS540x1AB3
211323001601MSS54HP0x28C9
211323001801MSS54HP0x29CB
211323001901MSS54HP0x29CB
211323002001MSS54HP0x29CB
211323002501MSS54HP0x29CB
211323002701MSS54HP0x29CB
211325000301MSS54HP {csl}0x28CB
211325000401MSS54HP {csl}0x28CB

You should see a string that looks as follows:
Code:
C8 1E 06 00 DA FE
Alternately, you can also search the partial binary for 'C8 1E 06 00'.

----- BEHAVIOUR MODIFICATION -----

If you would like the shift light pattern to illuminate regardless of the sport mode setting, set the byte at the proper offset to '01' as follows:
Code:
C8 1E 06 01 DA FE
If you would only like the shift light pattern to illuminate while in sport mode, set the byte to '02':
Code:
C8 1E 06 02 DA FE
----- ERRATA -----

The shift light display will exhibit erratic behaviour when lowering the rev limits in neutral (either for "flat-foot shifting" or for 6MT "launch control" and may trigger on a shift regardless of in-gear RPM. There is no known workaround to date.

Last edited by p0lar; Thu, Mar-13-2014 at 02:37:49 PM.
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Old Wed, Jan-15-2014, 07:46:57 PM   #2
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Default Re: 6MT Shift Lights Howto

Must have been under a rock - there is a 6MT launch control? WTF? Off to search
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Old Wed, Jan-15-2014, 08:00:32 PM   #3
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Default Re: 6MT Shift Lights Howto

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Originally Posted by chriskuta View Post
Must have been under a rock - there is a 6MT launch control? WTF? Off to search
It's right there above, just lower the limits on the neutral gear.

I personally find both to be worthless in all situations other than a drag race, which the M3 is notoriously a horrible car to be repurposed for, but to each his own!
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Old Wed, Jan-15-2014, 11:06:33 PM   #4
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Default Re: 6MT Shift Lights Howto

p0lar, is there a way to modify the binary to make the shift lights to lit up 1000rpm earlier on 3rd, 4th, 5th and 6th gears?
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Old Wed, Jan-15-2014, 11:25:21 PM   #5
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Default Re: 6MT Shift Lights Howto

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p0lar, is there a way to modify the binary to make the shift lights to lit up 1000rpm earlier on 3rd, 4th, 5th and 6th gears?
Good question, that's probably controlled within the program space, but I bet it's a calculation therein as when I raise my rev limits, the shift lights seem to follow that raise.
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Old Wed, Jan-15-2014, 11:52:27 PM   #6
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Default Re: 6MT Shift Lights Howto

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Originally Posted by p0lar View Post
Good question, that's probably controlled within the program space, but I bet it's a calculation therein as when I raise my rev limits, the shift lights seem to follow that raise.
I notice that too about the raising the rev limits. The higher the rev limits the later the rev lights lid up too. But the 1st and 2nd gears the rev lights seems to lid up earlier as compared to 3rd gears onwards and the higher the gears the later the rev lights lid up.
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Old Wed, Jan-15-2014, 11:55:05 PM   #7
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Default Re: 6MT Shift Lights Howto

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Originally Posted by certify View Post
I notice that too about the raising the rev limits. The higher the rev limits the later the rev lights lid up too. But the 1st and 2nd gears the rev lights seems to lid up earlier as compared to 3rd gears onwards and the higher the gears the later the rev lights lid up.
There's definitely a hysteresis function that governs that, but I'm not aware that it exists in the parameter space. I'll look through it again, but the bits for the lights are pretty confined.
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Old Thu, Jan-16-2014, 03:50:33 AM   #8
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Default Re: 6MT Shift Lights Howto

Quote:
Originally Posted by p0lar View Post
There's definitely a hysteresis function that governs that, but I'm not aware that it exists in the parameter space. I'll look through it again, but the bits for the lights are pretty confined.
Probably based on a predicted time to reach the rev limit. I.e. it lights up at 6500 rpm when in 2nd vice 7250 rpm when in 5h. This is because the rpm's are rising more rapidly in 2nd than they would be in 4th so you need to shift earlier in order not to hit the limiter(assuming shifting takes a constant amount of time). (all those numbers are completely made up)
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Old Thu, Jan-16-2014, 08:29:50 AM   #9
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Default Re: 6MT Shift Lights Howto

Quote:
Originally Posted by p0lar View Post
There's definitely a hysteresis function that governs that, but I'm not aware that it exists in the parameter space. I'll look through it again, but the bits for the lights are pretty confined.
If this can be discovered, it would another new discovery by itself. By then it could be closer to e92 M3 DCT shift lights!
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Old Wed, Mar-19-2014, 10:51:43 PM   #10
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Default Re: 6MT Shift Lights Howto

Can you program the shift lights to only come on when sport mode is equipped for a 6 mt car? Leaving them off when sport isn't on
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Discussing 6MT Shift Lights Howto 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)