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seanmul

Light control module pins outs E39

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Can someone point me in the way of the pin outs of the LCM please.

In particular the I-bus (instrumentation bus)connections.

I need to know where the flowing signals or sent from:

Belt warning

Reverse gear detection (manual transmission)

Left turn signal indicator

Right turn signal indicator

Front fog light

Rear fog light

High beam

I'm not looking for repair links etc....

I just want the 3 connectors and what each wire does and goes to.

thanks

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After 09/98.

A3 Light module

Plug connector overview

Number X-pin, colour Description

X12 15-pin, black Plug connector Light module

X38 15-pin, white Plug connector Light module

X10117 54-pin, black Plug connector Light module

Pin assignments at plug connector X12

Pin Type Description / Signal type Connection /

Measuring notes

1 A Right rear fog light Rear right light I

2 A Left tail light Rear left light I

3 A Right front turn signal indicator Right front turn signal indicator Front right auxiliary flasher unit USA

4 A Right fog light Right fog light

5 A Left licence plate light Left licence plate light

6 A Right front turn signal indicator Right front turn signal indicator

7 M Control unit ground Ground point

8 A Rear left turn signal indicator Rear left light I

9 A Left brake light Rear left light I

10 A Centre brake light Raised brake light

11 A Left low beam light Low beam light, left

12 A Right licence plate light Right licence plate light

13 A Right high beam light Right high beam

14 A Right front turn signal indicator Tyre pressure control Front right auxiliary flasher unit

15 E Voltage supply terminal 30 Fuse F112

Pin assignments at plug connector X38

Pin Type Description / Signal type Connection /

Measuring notes

1 A Signal line, night lights Connector terminal 58

2 M Control unit ground Ground connector

3 A Right low beam light Low beam light, right

4 A Left front turn signal indicator Tyre pressure control Front left auxiliary flasher unit

5 A Inner left tail light Rear left light I

6 A Left high beam light Left high beam

7 A Left fog light Left fog light

8 E Voltage supply terminal 30 Fuse F113

9 A Left reversing light Rear left light I

10 A Right reversing light Rear right light I

11 A Left front turn signal indicator Left front turn signal indicator

12 A Rear left turn signal indicator Rear right light I

13 A Inner right tail light Rear right light I

14 A Right brake light Rear right light I

15 A Left rear fog light Rear left light I

Pin assignments at plug connector X10117

Pin Type Description / Signal type Connection /

Measuring notes

1 A Lighting, light switch Light switch

2 A Signal, headlight vertical aim control Actuator for headlight beam throw control, left

3 A Signal, headlight vertical aim control Actuator for headlight beam throw control, left

4 A Signal, headlight vertical aim control Actuator for headlight beam throw control, left

5 A Signal, headlight vertical aim control Actuator for headlight beam throw control, left

6 E Belt signal Driver's airbag

7 E Signal, hazard warning lights ON Hazard warning flasher switch

8 E Signal, rear fog light ON Fog light switch

9 Not used

10 E Wash water level Wash water level switch

11 Not used

12 Not used

13 E Voltage supply terminal R Fuse F41

14 E Signal, right turn signal indicator Turn indicator/low beam selector

15 E Oil level - thermal DME control unit DDE control unit Digital diesel electronics control unit

16 E Signal, night light dimmer Dimmer

17 A Right tail light Rear right light I

18 A Front left parking light Left front turn signal indicator

19 A Lights, hazard warning switch Hazard warning flasher switch

20 A Signal, headlight vertical aim control Actuator for headlight beam throw control, right

21 A Signal, headlight vertical aim control Actuator for headlight beam throw control, right

22 A Signal, headlight vertical aim control Actuator for headlight beam throw control, right

23 A Signal, headlight vertical aim control Actuator for headlight beam throw control, right

24 E Coolant level Coolant level switch

25 E Brake light signal Brake light switch

26 A Reversing signal Gong, Japan

27 A Supply for beam throw control unit (LWR) Beam throw adjustment control unit (LWR)

28 A Reversing signal Intermittent wipe/wash control unit, rear

29 Not used

30 Not used

31 E Terminal 15 Fuse F16

32 E Signal, left turn signal indicator Turn indicator/low beam selector

33 E Headlights ON signal Light switch

34 E Signal Beam throw adjustment Headlight beam angle adjust potentiometer

35 A Interface AHM/LM Trailer module (AHM)

36 E/A I/K-bus signal link Connector, I/K-bus

37 Not used

38 E Reversing signal Navigation control unit

39 E Reversing signal Electrochromic interior rear view mirror

40 Not used

41 E Brake fluid level Brake fluid level switch

42 Not used

43 E Headlamp flasher signal Turn indicator/low beam selector

44 E Signal, high beam ON Turn indicator/low beam selector

45 E Signal, rear fog light ON Fog light switch

46 Not used

47 Not used

48 Not used

49 Not used

50 Not used

51 E Signal, parking light ON Light switch

52 Not used

53 E Signal Beam throw adjustment Headlight beam angle adjust potentiometer

54 A Lights, terminal 58 EDC control unit

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Before 09/98.

Not M62.

A3 Light module

Plug connector overview

Number X-pin, colour Description

X12 15-pin, black Plug connector Light module

X38 15-pin, white Plug connector Light module

X10117 54-pin, black Plug connector Light module

Pin assignments at plug connector X12

Pin Type Description / Signal type Connection /

Measuring notes

1 A Right rear fog light Rear right light I

2 A Left tail light Rear left light I

3 A Right front turn signal indicator Right front turn signal indicator

4 A Right fog light Right fog light

5 A Left licence plate light Left licence plate light

6 A Right front turn signal indicator Right front turn signal indicator

7 M Control unit ground Ground point

8 A Rear left turn signal indicator Rear left light I

9 A Left brake light Rear left light I

10 A Centre brake light Raised brake light

11 A Left low beam light Low beam light, left

12 A Right licence plate light Right licence plate light

13 A Right high beam light Right high beam

14 A Right front turn signal indicator Front right auxiliary flasher unit

15 E Voltage supply terminal 30 Fuse F112

Pin assignments at plug connector X38

Pin Type Description / Signal type Connection /

Measuring notes

1 A Signal line, night lights Connector terminal 58

2 M Control unit ground Ground connector

3 A Right low beam light Low beam light, right

4 A Left front turn signal indicator Front left auxiliary flasher unit

5 A Inner left tail light Rear left light I

6 A Left high beam light Left high beam

7 A Left fog light Left fog light

8 E Voltage supply terminal 30 Fuse F113

9 A Left reversing light Rear left light I

10 A Right reversing light Rear right light I

11 A Left front turn signal indicator Left front turn signal indicator

12 A Rear left turn signal indicator Rear right light I

13 A Inner right tail light Rear right light I

14 A Right brake light Rear right light I

15 A Left rear fog light Rear left light I

Pin assignments at plug connector X10117

Pin Type Description / Signal type Connection /

Measuring notes

1 A Lighting, light switch Light switch

2 Not used

3 Not used

4 Not used

5 Not used

6 E Belt signal Driver's airbag

7 E Signal, hazard warning lights ON Hazard warning flasher switch

8 E Signal, rear fog light ON Fog light switch

9 Not used

10 E Wash water level Wash water level switch

11 Not used

12 Not used

13 E Voltage supply terminal R Fuse F41

14 E Signal, right turn signal indicator Turn indicator/low beam selector

15 E Oil level - thermal DME control unit

16 E Signal, night light dimmer Dimmer

17 A Right tail light Rear right light I

18 A Front left parking light Left front turn signal indicator

19 A Lights, hazard warning switch Hazard warning flasher switch

20 Not used

21 Not used

22 Not used

23 Not used

24 E Coolant level Coolant level switch

25 E Brake light signal Brake light switch

26 Not used

27 A Supply for beam throw control unit (LWR) Beam throw adjustment control unit (LWR)

28 A Reversing signal Intermittent wipe/wash control unit, rear

29 Not used

30 Not used

31 E Terminal 15 Fuse F16

32 E Signal, left turn signal indicator Turn indicator/low beam selector

33 E Headlights ON signal Light switch

34 E Signal Beam throw adjustment Headlight beam angle adjust potentiometer

35 Not used

36 E/A I/K-bus signal link Connector, I/K-bus

37 Not used

38 E Reversing signal Navigation control unit

39 Not used

40 Not used

41 E Brake fluid level Brake fluid level switch

42 Not used

43 E Headlamp flasher signal Turn indicator/low beam selector

44 E Signal, high beam ON Turn indicator/low beam selector

45 E Signal, rear fog light ON Fog light switch

46 Not used

47 Not used

48 Not used

49 Not used

50 Not used

51 E Signal, parking light ON Light switch

52 Not used

53 E Signal Beam throw adjustment Headlight beam angle adjust potentiometer

54 A Lights, terminal 58 EDC control unit

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Fixed it at last, the I Bus comms wire that comes from the IKE to the LCM

was corroded, looks like it was just from constant rubbing off the car body.

Anyone that's removed a LCM before will know how tight these wires are crammed in.

I managed to get a hold of AUTODATA on a laptop also, it helped to located the correct wire.

Anyway, I cut out the offending wire and replaced it, and bingo, all my lights on the dash,

my OBC functions like door open, lighhts on, check rear lights etc....now work.

I now also have reverse light,

my tick tock and green arows work again, as do my front and rear fog and high beam inticators.

I'll do up a document and post it with my other thread on the car problems.

If I didn't get thi going myself, to be honest the cars days were numbered. I wasn't paying for

a new LCM. The car is too old to justify the expense.

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I'm looking for the pins/wiring colours for a post 9/2000 touring LCM.  Unfortunately the links to the PDFs no longer work.  Any ideas?  Basically just need to know which one/ones run to the N/S rear inner and outer tail lights.

Dave

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