A3a Light switch cluster

Plug connector overview

NumberX-pin, colourDescription
X1254-pin, blackPlug connector Light switch cluster

Pin assignments at plug connector X12

PinTypeDescription / Signal typeConnection /
Measuring notes
1ASignal Rear left direction indicatorTail light, left
   
2AActivation, right bi-xenon headlightLeft headlight
   
3ASignal, right auxiliary direction indicator lightDirection indicator light repeater, front right
   
4 Not used 
   
5ASignal, left brake lightTail light, left
   
6ETerminal 30Fuse F60
   
7ASignal, left low beam lightLeft headlight
   
8ASignal, right high beam lightRight headlight
   
9 Not used 
   
10ASignal Right brake lightTail light, right
   
11ASignal, front right direction indicatorRight headlight
   
12ASignal, left/right direction indicator switchDirection indicator/high beam headlight switch
   
13ASignal, high beam/headlight flasher switchDirection indicator/high beam headlight switch
   
14ASignal, rear load sensorRide height sensor
   
15ETerminal 15Fuse F23
   
16ASignal, centre brake lightAuxiliary brake light
   
17ASignal, licence plate lightLicence plate lights
   
18ASignal, left auxiliary direction indicator lightDirection indicator light repeater, front left
   
19ASignal ground, front load sensorLoad sensor, headlight vertical aim control
   
20ASignal, front left direction indicatorLeft headlight
   
21E/AK-bus signalK-bus connector
   
22ASignal, front load sensorLoad sensor, headlight vertical aim control
   
23ASignal, +5 V front load sensorLoad sensor, headlight vertical aim control
   
24ASignal, hazard warning switchHazard warning/central locking switch
   
25EBrake lightConnector Brake light
   
26ASignal, CD changer AF -Ride height sensor
   
27ETerminal RFuse F14
   
28ASignal, fog light relay activationFog light relay
   
29ATail lightTail light, right
   
30ATail lightTail light, left
   
31MGroundGround connector
   
32MGroundGround point
   
33ETerminal 30Fuse F59
   
34ASignal, right low beam lightRight headlight
   
35ASignal, left high beam lightLeft headlight
   
36AActivation, left bi-xenon headlightLeft headlight
   
37ASignal, front right direction indicatorRight headlight
   
38 Not used 
   
39ASignal, headlight vertical aim control Q22 motor, leftStepper motor for headlight vertical aim control, left
   
40ASignal, headlight vertical aim control Q11 motor, leftStepper motor for headlight vertical aim control, left
   
41ASignal, headlight vertical aim control Q12 motor, leftStepper motor for headlight vertical aim control, left
   
42ASignal, headlight vertical aim control Q21 motor, leftStepper motor for headlight vertical aim control, left
   
43ASignal Rear right direction indicatorTail light, right
   
44ASignal, front right parking lightRight headlight
   
45ASignal, front left parking lightLeft headlight
   
46ASignal ground, rear load sensorRide height sensor
   
47ASignal Locator lightingConnector, instrument and locator lighting
   
48ASignal, lamp in hazard warning switchHazard warning/central locking switch
   
49ASignal, rear fog lightLHD: Tail light, left RHD: Tail light, right
   
50ASignal, front left direction indicatorLeft headlight
   
51ASignal, headlight vertical aim control Q22 motor, rightStepper motor for headlight vertical aim control, right
   
52ASignal, headlight vertical aim control Q11 motor, rightStepper motor for headlight vertical aim control, right
   
53ASignal, headlight vertical aim control Q12 motor, rightStepper motor for headlight vertical aim control, right
   
54ASignal, headlight vertical aim control Q21 motor, rightStepper motor for headlight vertical aim control, right