A3 Light module

Connector overview

Number	X-pin, color	Description
X12	15-pin, black	Connector Light module
X38	15-pin, white	Connector Light module
X10117	54-pin, black	Connector Light module

Pin assignments at connector X12

Pin	Type	Description / Signal type	Connection / Measuring notes
1	A	Right rear fog light	Right rear light assembly I

2	A	Left tail light	Left rear light assembly I

3	A	Right front turn light	Right front turn signal lamp

4	A	Right fog light	Right fog light

5	A	Left license plate light	Left license plate light

6	A	Right front turn light	Right front turn signal lamp

7	M	Control module ground	Ground point

8	A	Rear left turn light	Left rear light assembly I

9	A	Left brake light	Left rear light assembly I

10	A	Center brake light	High level stop light

11	A	Left low beam light	Low beam light, left

12	A	Right license plate light	Right license plate light

13	A	Right high beam light	Right high beam

14	A	Right front turn light	Right front auxiliary turn light

15	E	Terminal 30 voltage supply	Fuse F112

Pin assignments at connector X38

Pin	Type	Description / Signal type	Connection / Measuring notes
1	A	Nighttime illumination signal line	Terminal 58 splice

2	M	Control module ground	Ground splice

3	A	Right low beam light	Low beam light, right

4	A	Left front turn light	Left front auxiliary turn light

5	A	Left tail light	Left rear light assembly I

6	A	Left high beam light	Left high beam

7	A	Left fog light	Left fog light

8	E	Terminal 30 voltage supply	Fuse F113

9	A	Left back-up light	Left rear light assembly I

10	A	Right back-up light	Right rear light assembly I

11	A	Left front turn light	Left front turn signal lamp

12	A	LH rear turn light	Right rear light assembly I

13	A	Right tail light	Right rear light assembly I

14	A	Right brake light	Right rear light assembly I

15	A	Left rear fog light	Left rear light assembly I

Pin assignments at connector X10117

Pin	Type	Description / Signal type	Connection / Measuring notes
1	A	Illumination switch	Light switch

2		Not used

3		Not used

4		Not used

5		Not used

6	E	Seat belt signal	Driver's air bag

7	E	Hazard lights ON signal	Hazard warning flasher switch

8	E	Rear fog light ON signal	Fog light switch

9		Not used

10	E	Washer fluid level	Washer fluid level switch

11		Not used

12		Not used

13	E	Voltage supply terminal R	Fuse F41

14	E	Right turn light signal	Combination switch

15	E	Oil level - thermal	Engine control module (DME)

16	E	Dimmer signal	Dimmer

17	A	Right tail light	Right rear light assembly I

18	A	LH front park light	Left front turn signal lamp

19	A	Hazard switch illumination	Hazard warning flasher switch

20		Not used

21		Not used

22		Not used

23		Not used

24	E	Engine coolant level	Engine coolant level switch

25	E	Brake light signal	Brake light switch

26		Not used

27	A	Headlight widening control module power	Headlight widening control module

28	A	Back up signal	Intermittent wipe/wash control unit, rear

29		Not used

30		Not used

31	E	Terminal 15	Fuse F16

32	E	Left turn light signal	Combination switch

33	E	Headlights ON signal	Light switch

34	E	Signal Headlight widening adjustment	Headlight widening potentiometer

35		Not used

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

37		Not used

38	E	Back up signal	Navigation control module

39		Not used

40		Not used

41	E	Brake fluid level	Brake fluid level switch

42		Not used

43	E	Headlight flash signal	Combination switch

44	E	High beam ON signal	Combination switch

45	E	Rear fog light ON signal	Fog light switch

46		Not used

47		Not used

48		Not used

49		Not used

50		Not used

51	E	Park light ON signal	Light switch

52		Not used

53	E	Signal Headlight widening adjustment	Headlight widening potentiometer

54	A	Terminal 58 illumination	Electronic shock absorber control module (EDC)