A3 Light module

Plug connector overview

Number X-pin, colour Description
X12 15-pin, black Plug connector A Light module
X38 15-pin, white Plug connector B Light module
X10117 26-pin, black Plug connector C 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 Front right parking light Right headlight
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 connector
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 Left headlight
12 A Right licence plate light Right licence plate light
13 A Right high beam light Right headlight
14 A Right front turn signal indicator Front right auxiliary flasher unit
15 E Terminal 30 Fuse F112
Pin assignments at plug connector X38

Pin Type Description / Signal type Connection /
Measuring notes
1 A Night light signal Connector, terminal 58g
2 M Control unit ground Ground connector
3 A Right low beam light Right headlight
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 Right headlight
7 A Left fog light Left fog light
8 E 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 E Signal, brake pedal operated Brake light switch
5 E Signal, rear fog light ON Fog light switch
6 E Headlamp flasher signal Turn indicator/low beam selector
7 Not used
8 E Headlights ON signal Light switch
9 E Signal, left turn signal indicator Turn indicator/low beam selector
10 E Signal, night light dimmer Dimmer
11 A Right tail light Rear right light I
12 A Front left parking light Left headlight
13 A Supply for beam throw control unit (LWR) Beam throw adjustment control unit (LWR)
14 A Acoustic signal Gong
15 A Activation, interior rear-view mirror Electrochromic interior rear view mirror
16 Not used
17 E Signal, rear fog lights ON Fog light switch
18 E Terminal 15 Fuse F23
19 E Signal, high beam ON Turn indicator/low beam selector
20 E Signal, hazard warning lights ON Hazard warning flasher switch
21 E Signal, parking light ON Light switch
22 E Signal, right turn signal indicator Turn indicator/low beam selector
23 A I-bus signal line I-bus connector
24 A Lights, hazard warning switch Hazard warning flasher switch
25 E AHM signal line Trailer module (AHM)
26 A Lights, terminal 58 EDC control unit