A3 Light module

Plug connector overview

NumberX-pin, colourDescription
X1215-pin, blackPlug connector Light module
X3815-pin, whitePlug connector Light module
X1011754-pin, blackPlug connector Light module

Pin assignments at plug connector X12

PinTypeDescription / Signal typeConnection /
Measuring notes
1ARight rear fog lightRear right light I
   
2ALeft tail lightRear left light I
   
3ARight parking lightRight headlight EUR
   
3ARight front turn signal indicatorRight front turn signal indicator USA
   
4ARight fog lightRight fog light
   
5ALeft licence plate lightLeft licence plate light
   
6ARight front turn signal indicatorRight front turn signal indicator EUR
   
6 Not usedUSA
   
7MControl unit groundGround point
   
8ARear left turn signal indicatorRear left light I
   
9ALeft brake lightRear left light I
   
10ACentre brake lightRaised brake light
   
11ALeft low beam lightLow beam light, left
   
12ARight licence plate lightRight licence plate light
   
13ARight high beam lightRight high beam
   
14ARight front turn signal indicatorFront right auxiliary flasher unit
   
15EVoltage supply terminal 30Fuse F6
   

Pin assignments at plug connector X38

PinTypeDescription / Signal typeConnection /
Measuring notes
1ASignal line, night lightsConnector terminal 58
   
2MControl unit groundClutch signal
   
3ARight low beam lightLow beam light, right
   
4ALeft front turn signal indicatorFront left auxiliary flasher unit
   
5AInner left tail lightRear left light I
   
6ALeft high beam lightLeft high beam
   
7ALeft fog lightLeft fog light
   
8EVoltage supply terminal 30Fuse F113
   
9ALeft reversing lightRear left light I
   
10ARight reversing lightRear right light I
   
11ALeft front turn signal indicatorLeft front turn signal indicator
   
12ARear left turn signal indicatorRear right light I
   
13AInner right tail lightRear right light I
   
14ARight brake lightRear right light I
   
15ALeft rear fog lightRear left light I
   

Pin assignments at plug connector X10117

PinTypeDescription / Signal typeConnection /
Measuring notes
1ALighting, light switchLight switch
   
2ASignal, headlight vertical aim controlActuator for headlight beam throw control, left
   
3ASignal, headlight vertical aim controlActuator for headlight beam throw control, left
   
4ASignal, headlight vertical aim controlActuator for headlight beam throw control, left
   
5ASignal, headlight vertical aim controlActuator for headlight beam throw control, left
   
6EBelt signalDriver's airbag
   
7ESignal, hazard warning lights ONHazard warning flasher switch
   
8ESignal, rear fog light ONFog light switch
   
9 Not used 
   
10EWash water levelWash water level switch
   
11 Not used 
   
12AWarning lamp preheating/error signalDDE control unit (M51 only)
   
13EVoltage supply terminal RFuse F44
   
14ESignal, right turn signal indicatorTurn indicator/low beam selector
   
15EOil level - thermalDME control unit Digital diesel electronics control unit (not M51)
   
16ESignal, night light dimmerDimmer
   
17ARight tail lightRear right light I
   
18ALeft parking lightLeft headlight EUR
   
18ALeft front turn signal indicatorLeft front turn signal indicator USA
   
19ALights, hazard warning switchHazard warning flasher switch
   
20ASignal, headlight vertical aim controlActuator for headlight beam throw control, right
   
21ASignal, headlight vertical aim controlActuator for headlight beam throw control, right
   
22ASignal, headlight vertical aim controlActuator for headlight beam throw control, right
   
23ASignal, headlight vertical aim controlActuator for headlight beam throw control, right
   
24ECoolant levelCoolant level switch
   
25EBrake light signalBrake light switch
   
26AReversing signalGong Japan
   
27ASupply for beam throw control unit (LWR)Beam throw adjustment control unit (LWR)
   
28 Not used 
   
29 Not used 
   
30 Not used 
   
31ETerminal 15Fuse F23
   
32ESignal, left turn signal indicatorTurn indicator/low beam selector
   
33EHeadlights ON signalLight switch
   
34ESignal Beam throw adjustmentHeadlight beam angle adjust potentiometer
   
35ELight module-trailer module connectorTrailer module (AHM) EUR
   
36E/AI/K-bus signal linkConnector, I/K-bus
   
37 Not used 
   
38EReversing signalNavigation control unit
   
39EReversing signalElectrochromic interior rear view mirror
   
40 Not used 
   
41EBrake fluid levelBrake fluid level switch ABS/DSC control unit
   
42 Not used 
   
43EHeadlamp flasher signalTurn indicator/low beam selector
   
44ESignal, high beam ONTurn indicator/low beam selector
   
45ESignal, rear fog light ONFog light switch
   
46 Not used 
   
47 Not used 
   
48 Not used 
   
49 Not used 
   
50 Not used 
   
51ESignal, parking light ONLight switch
   
52 Not used 
   
53ESignal Beam throw adjustmentHeadlight beam angle adjust potentiometer
   
54ALights, terminal 58EDC control unit