A1 General module control unit

Connector location views

Number	X-pin, colour	Description
X253	54-pin, black	Plug connector General module control unit
X254	26-pin, black	Plug connector General module control unit
X332	15-pin, black	Plug connector General module control unit

Pin assignments at plug connector X253

Pin	Type	Description / Signal type	Connection / Measuring notes
1	E	Signal, wiper switch 1	Windscreen wiper switch

2		Not used

3	E	Signal, wiper switch 2	Windscreen wiper switch

4	E	Signal, front passenger's power window switch, open	Passenger's door power window switch

5	E	Signal, driver's power window switch, open	Switch block, driver's door

6	E	Signal, boot lid button open from inside	Rear lid release switch (interior)

7	E	Signal, centerlock button	Hazard warning/central locking switch

8	E	Signal, interior light switch, continuous operation	Interior/reading lamp, front

9	E/A	K-bus signal	K-bus connector

10	M	Ground	Ground point

11	A	Signal, wiper relay	Wiper relay

12	A	Signal, headlight washer pump relay	Headlight washer module

13	A	Motor signal, ZV unit lock driver's door	System lock, driver's door

14	A	Motor signal, ZV unit central arrest	System lock, rear passenger's side

15	A	Motor signal, ZV unit central arrest	System lock, rear driver's side

16	A	with remote control: Motor signal, ZV unit central arrest	System lock, passenger's door

17	A	Motor signal, unlock boot lid	Central locking drive, boot lid/tailgate

18	E	Signal Interior light	Connector Interior light

19	E	Signal, wash switch	Windscreen wiper switch

20	E	Signal, unlock driver's door	System lock, driver's door

21		Not used

22	E	Signal, lock driver's door	System lock, driver's door

23	E	Signal, rear passenger's side door contact	System lock, rear passenger's side

24	E	Signal, rear driver's side door contact	System lock, rear driver's side

25	E	Signal, front passenger's door contact	System lock, passenger's door

26	E	Signal, driver's door contact	System lock, driver's door

27	E	Terminal R	Fuse F9

28	E	Signal, anti-trapping strip, driver's door	Jamming protection switch, driver's side

29	E	Signal, anti-trapping strip, front passenger's door	Jamming protection switch, passenger's side

30	A	Signal, wiper relay for speed 2	Wiper relay

31		Not used

32	A	Motor signal, ZV unit central arrest	System lock, driver's door

33	A	with remote control: Motor signal, ZV unit unlock	System lock, passenger's door

34	A	Signal, central locking motor, unlock	System lock, rear driver's side

35	A	Motor signal, ZV unit unlock	Central locking drive, fuel filler flap

36	A	Motor signal, ZV unit unlock	System lock, rear passenger's side

37	E	Motor signal, lock boot lid	Rear lid lock switch

38		Not used

39		Not used

40	E	Switch signal, passenger's window regulator closed	Passenger's door power window switch

41	E	Signal, driver's power window switch, closed	Switch block, driver's door

42	E	Signal, boot lid contact	Central locking drive, boot lid/tailgate

43		Not used

44	E	Signal, boot lid button, open	Licence plate lights

45	E	Signal Return contact, wiper rest position	Connector Return contact, wiper rest position

46	E	Signal, potentiometer for interval time	Windscreen wiper switch

47	E	Terminal 30	Fuse F49

48	A/E	LIN-bus	Connector LIN-bus

49	E	Signal, data line ZV remote control	Electrochromic interior rear-view mirror Remote control central locking

50	A	Motor signal, ZV unit central arrest	Central locking drive, fuel filler flap

51	A	Motor signal, ZV unit unlock	System lock, driver's door

52	A	Motor signal, ZV unit lock	System lock, rear passenger's side

53	A	Motor signal, ZV unit lock	System lock, rear driver's side

54	A	with remote control: Motor signal, ZV unit lock	System lock, passenger's door

Pin assignments at plug connector X254

Pin	Type	Description / Signal type	Connection / Measuring notes
1	E	Signal, rear passenger's side power window switch, closed	Power window switch, rear right

2	E	Signal, rear driver's side power window switch, closed	Switch block, driver's door

3	E	Signal, rear passenger's side power window switch, closed	Passenger's door power window switch

4	E	Signal, rear driver's side power window switch, closed	Power window switch, rear left

5	E	Signal, status of antitheft alarm system	Tilt monitoring

6	A	Signal, tilt alarm sensor	Tilt monitoring

7	E	Signal, front lid contact	Front lid contact switch

8	A	Control signal, DWA siren alarm	Horn for antitheft alarm system

9		Not used

10	E	Motor signal, unlock boot lid	Rear lid lock switch

11	A	Signal, heated water jet	Right windscreen washer jet heater

12	E	Signal, anti-trapping strip, rear passenger's side	Jamming protection switch, rear right window

13		Not used

14	E	Signal, rear driver's side power window switch, open	Switch block, driver's door

15	E	Signal, rear passenger's side power window switch, open	Passenger's door power window switch

16	E	Signal, rear driver's side power window switch, open	Power window switch, rear left

17	E	Signal, rear passenger's side power window switch, open	Power window switch, rear right

18		Not used

19		Not used

20		Not used

21	E	Signal, child safety lock window regulator	Switch block, driver's door

22	A	Signal, switch off consumer load	Connector Load cutout

23	A	Signal, DWA LED	Electrochromic interior rear-view mirror

24	E	Signal, interior protection	Control unit, interior protection I

25	A	Signal, heated water jet	Right windscreen washer jet heater

26	E	Signal, anti-trapping strip, rear driver's side	Jamming protection switch, rear left window

Pin assignments at plug connector X332

Pin	Type	Description / Signal type	Connection / Measuring notes
1	E	Supply for interior lights, washer pump, tailgate/rear lid release and load cutout	Fuse F52

2	A	Signal, washer pump	Washer pump

3	A	Signal, switch off consumer load	Connector Load cutout

4	A	Signal, rear driver's side power window motor, closed	Window regulator motor, rear left

5	A	Signal, rear passenger's side power window motor, closed	Window regulator motor, rear right

6	A	Signal, front passenger's power window motor, open	Passenger's window motor

7	A	Signal, driver's power window motor, open	Driver's window motor

8	E	Supply, front window regulator	Fuse F48

9	E	Supply, central locking system	Fuse F60

10	E	Supply, rear window regulator	Fuse F71

11	A	Signal, rear driver's side power window motor, open	Window regulator motor, rear left

12	A	Signal, rear passenger's side power window motor, open	Window regulator motor, rear right

13	A	Signal, front passenger's power window motor, closed	Passenger's window motor

14	A	Signal, driver's power window motor, closed	Driver's window motor

15	M	Load ground, central locking and window regulators	Ground point