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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Tue, Sep-05-2017, 06:38:18 PM   #11
M_Parallel
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Default Re: Bypassing the CCM to avoid "Low Beam Failure" message on OBC.

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Originally Posted by Eric M3 View Post
That started already with the E32 7 1988-1994 series (in Europe even from around mid 1986), hot and cold checking of bulbs. So even when lights are not switched on and something is wrong with the bulbs or other things, check control warning comes on.
There is no cold-checking on the E36. Message is only thrown when you turn the lights on.
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Old Tue, Sep-05-2017, 09:40:46 PM   #12
John Firestone
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Default Re: Bypassing the CCM to avoid "Low Beam Failure" message on OBC.

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Originally Posted by Eric M3 View Post
That started already with the E32 7 1988-1994 series (in Europe even from around mid 1986), hot and cold checking of bulbs. So even when lights are not switched on and something is wrong with the bulbs or other things, check control warning comes on.
Are you sure about that early date? From what I can tell, cold bulb checking did not appear on the E32 until the early 90s.

Before then, the E32 modules, like the E36 ones, only checked bulbs when in use, by powering the bulb through a metallic, current sensing shunt, and measuring the slight voltage drop across it. A fault will register when the drop gets too low (for an E36 check module I looked at, below a threshold of 7~20 mV) from too little current flowing through the shunt.

The later modules , for example, the E39 LCMs, use a microcontroller and "smart" MOSFET high-side switches to cold check the bulbs.

EDIT: This page, around halfway down, shows an earlier E32 LKM with metallic shunts and hot-check-only, 1970's-era, CMOS MSI logic.

Last edited by John Firestone; Tue, Sep-05-2017 at 10:00:18 PM.
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Old Tue, Sep-05-2017, 10:22:55 PM   #13
Eric M3
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Default Bypassing the CCM to avoid "Low Beam Failure" message on OBC.

Yes, I am 100% sure, the E32 has hot and cold checking, but there were 2 different versions of LKM in the E32, LKM-B = Basis, and LKM-L, Luxus, and the LKM-L as installed in my 11/88 E32 750iL has the cold checking.
That we already discussed back in 2010 on the German 7-forum, see post 2 with a pic of the TI
http://www.7-forum.com/forum/5/lkm-b-lkm-l-139204.html

Das LKM-L verfügt über Kaltabfrage, d.h. es erfasst defekte Lampen auch, wenn man sie nicht einschaltet

LKM is the german abbreviation for "Licht Kontroll Modul", the light control modul.

LKM-L and LKM-B pin -out
1 High Beam stalk at steering wheel
2 terminal 30 (continious power)
3 switch low beam/dip light
4 data to CCM = check control module
5 data to CCM = check control module
6 F1 terminal R, IC supply
7 from k7 P2 - tail light right

8 tail light right
9 tail light left
10 parking light right
11 parking light left
12 from brake light switch

13 brake light left
14 switch licence plate light on
15 3rd brake light
16 fog light front left
17 F7 15A, terminal 30
18 fog light switch
19 rear fog light switch

20 high beam via fuse F13, F14
21 low beam left F10
22 low beam right F11
23 check via CCM + CC + OBC (check control module-check control-on board computer)
24 ground
25 data to CCM

26 from K7P6 tail light left
27 from K7P9 parking light right
28 from K7P5 parking light left
29 brake light right

30 licence plate right
31 licence plate left
32 fog light right, front
33 fog light right, rear
34 fog light left, rear
35 F8 15A for rear fog light

Note: this is the ECE/EU version, some pins might be missing in other versions. But the set - up will be the same. So for the US LKM probably the pins for rear fog light might not be there respect. not connected internally.
Depending on year of production and the makers of the LKM the internal parts look different, but the pins are always for the same function.

L checks the bulbs while they are off and while they are on (cold and warm check), B can only check when lights are on. That is the biggest difference.
US LKM have generally one relay less inside the LKM, no matter if B or L, because they do not have rear foglights.
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Old Tue, Sep-05-2017, 10:29:53 PM   #14
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Default Re: Bypassing the CCM to avoid "Low Beam Failure" message on OBC.

For the case that you cannot enlarge the pic on the German Forum, here the German Info LKM-L and LKM-B for E32 which explains cold and hot checking, Warm- und Kaltueberwachung, same for E34
Attached Images
File Type: jpg FunktionsbeschreibungLKM.jpg (99.4 KB, 9 views)
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Old Tue, Sep-05-2017, 11:02:35 PM   #15
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Default Re: Bypassing the CCM to avoid "Low Beam Failure" message on OBC.

Very cool.

I just disabled the OBC since all my lights are now LEDs and I have HIDs.

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Discussing Bypassing the CCM to avoid "Low Beam Failure" message on OBC. in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)