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FQ101 will not be held responsible for any damage incurred as a result of working on your car's wiring systems. This information is for reference only.

The following information has been collected from a 2005 Brabus Roadster and a 2004 Roadster 80. Please note that this guide is only applicable for Roadsters (452). There are some fundamental differences with the fortwo SAM wiring configurations and therefore you should not use this guide if you have a fortwo.

To access the wiring of your SAM follow this guide. The connectors on the back of the SAM are as follows:

Note that connectors 21-30 are not used for N11-8 or N11-9. Details on how to access these are shown at the bottom of this guide.

If you would like a summarised wiring diagram, you can download and print off the following pdf. It may be easier to use this when working in your footwell:

N11-1 Wire Size Wire Colour Fuse No. Fuse Rating Function To/From SAM
1 1.5
1.5
Black/Yellow
Black/White
4 30 Left electric window
Right electric window
From
2 2.5 Black/Red 3 20 Interior heater fan. Heated seats control modules From
3 1.5 Black/Yellow 8 20 Ignition coils: cylinders 1,2,3 From
4 1.5
1.5
Pink/Red
Pink/Red
2 20 Wiper stalk supply
Wiper motor (via relay)
From
From
5 1.0 Violet 13 15 Front fog lamp supply (constant live) From
6 2.5 Red/Black 14 25 ESP control unit supply (constant live) From
7 2.5 Pink 12 15 Radio supply (constant live) From
8 - - 1 15 Starter motor relay From
N11-2 Wire Size Wire Colour Fuse No. Fuse Rating Function To/From SAM
1

0.5

Brown/Green

- - MEG (ECU) From
2 2.5 Black 28 30 Heated rear window, heated wing mirrors From
3 1.5 Red/White 11 7.5 Instrument cluster, pods, trip computer, key receiver (constant live) From
4 0.35

Red/Green

11

7.5

Triangle (hazard lights, central locking buttons - constant live)

From
5 4.0 Brown - - Ground for electric soft top relay From
6 4.0 Yellow 29 25 Soft top motor (via relay) From
7 0.35 Blue - - MEG (ECU) Gear select system (constant live) From
8 4.0 Red/White 29 25 Soft top motor (via relay) From
N11-3 Wire Size Wire Colour Fuse No. Fuse Rating Function To/From SAM
1

-

- 17 15 Rear wiper - not used on any Roadster -
2 1.5 Grey 18 7.5 Crash system (airbags, seat belts, ECU, ESP) From
3

0.5
0.5

Red/Yellow
Red/Yellow

19 7.5

Electric wing mirror switch & supply
Electric soft top switch

From
From

4 1.0

Blue

20

15

Front fog light relay, trip computer, radio, heated seat modules, power steering, rain/light sensor switched live supply.

From
5 1.5 Blue/Yellow 21 15 Cigarette lighter From
6 1.0 Grey/Red 22 7.5 Right headlight (low beam) From
7 1.0 Blue/Green 23 7.5 Left headlight (low beam) From
8 1.0 White 24 7.5 Right headlight (full beam) From
9

0.5
1.0

White/Blue
White/Blue

25 7.5

Dashboard indicator (full beam)
Left headlight (full beam)

From
From

10 1.5 Red/Black 16 10 Fuel pump, fuel level sensor From
11 1.0 Blue/Red 26 15 Brake lights (via brake switch - constant live) From
12 1.5 Red/White 27 7.5 MEG (ECU) power supply (constant live) From
N11-4 Wire Size Wire Colour Fuse No. Fuse Rating Function To/From SAM
1

4.0

Red/Black - - Ignition switch in position 1 (switched live supply) To
2 4.0 Red/Blue 30 40 Gearshift system From
N11-5 Wire Size Wire Colour Fuse No. Fuse Rating Function To/From SAM
1

-

- - - Not used -
2 - - 17 15 Rear wiper - not used on any Roadster -
3

1.5

Red

2 20 Wiper motor (via external relay) From
4 -

-

-

-

Wiper motor relay signal -
5 1.5 Brown - - SAM wiper motor relay ground From
6 0.75 Red/White 5 7.5 Indicator, headlight stalk (constant live) From
7 1.0 Brown/White 6 7.5 Right side lights, interior backlights, numberplate lights From
8 0.5 Red/Green 12 15 Interior light, rain/light sensor supply (constant live) From
9

0.5
0.75

Brown/Yellow
Brown/Grey

7 7.5

Left front side light
Left rear side light

From
10 1.5 Green 9 10 Engine connector (ESP) From
11 0.5 Black/Pink 10 15 MEG (ECU) Fuel pump instruction From
12 2.0 Yellow/Black 10 15 MEG (ECU) Engine run signal From
N11-6 Wire Size Wire Colour Fuse No. Fuse Rating Function To/From SAM
1

2.5

Blue 1 25 Starter motor From
2 2.5 Pink 32 30 Exhaust CAT preheater From
N11-7 Wire Size Wire Colour Fuse No. Fuse Rating Function To/From SAM
1

3.0

Red/White 35 30 EPS - Power steering (constant live) From
2 4.0 Red 34 50 ESP - Traction Control (constant live) From
3 4.0 Red/Black 33 50 Ignition starter switch (constant live) From
N11-8 Wire Size Wire Colour Function To/From SAM
1

-

- - -
2 0.5 Brown/White Ground for boot release From
3

0.5

Grey/Red Windscreen wiper stalk in intermittent position To
4 0.5 Yellow/White Right door microswitch (door open) [swap with 19 for LHD/RHD conversion] From
5 - - - -
6 - - - -
7 - - - -
8 0.5
0.5
Yellow/Green
Yellow/Green
Crash signal two airbags
Crash signal side airbags

From
From

9

0.75

Pink/Red Wiper motor park signal from wiper motor To
10 0.5 Green/Blue Console backlight signal from headlight stalk To
11 0.35 Black/Green Cruise control supply From
12 - - - -
13 0.5 Brown Ground for wiper system From
14 0.35 White/Black CAN interface High (to instrument cluster) Both
15 0.35 Brown/Red CAN interface Low (to interface cluster) Both
16 0.5 Red Steering wheel horn and paddle wheel From
17 0.5 Yellow Wiper stalk in fast position (up two positions) To
18 0.5 Blue/Black Central locking system door microswitches From
19 0.5 Yellow/Red Left door microswitch (door open) [swap with 4 for LHD/RHD conversion] From
20 0.5 Green Remote boot release switch From
31 0.5 Blue Interior fan in OFF position (to disable aircon) To
32 0.5 Blue/White Roof bar microswitches (to stop electric roof) From
33 0.5 Pink/Black Boot microswitch (to stop electric roof) From
34 0.5 Grey Hand brake indicator switch From
35 0.5 White Electric soft top switch From
36 - - - -
37 - - - -
38 0.5 Grey/Blue Ignition switch in position 2 To
39 0.35 White/Black CAN interface Low (to MEG and steering assist) Both
40 0.35 Brown/Red CAN interface High (to MEG and steering assist) Both
N11-9 Wire Size Wire Colour Function To/From SAM
1 0.75 Black/White Left indicators From
2 0.35 Grey Aircon first stage from triangle To
3 0.35 White/Grey OBD port pin 1 From
4 0.5 Grey/Blue Interior light (signal from door open) From
5 - - - -
6 0.5 Pink Front fog lamp relay ground (from external fog lamp relay) To
7 0.35 Pink/Red Cruise control (from stalk) To
8 - - - -
9 0.5 Blue/Yellow Auto lights switch From
10 0.35 Green/Brown Cruise control (from stalk) To
11 0.75 Black/Green Right indicators From
12 0.35 Violet/Blue Hazard light switch (from triangle) To
13 0.35 Blue Central locking switch (from triangle) To
14 0.5 Violet LIN bus to trip computer / pods / rain & light sensor Both
15 - - - -
16 0.5 Blue/White Wiper system relay ground To
17 0.35 Yellow/Black Front fog lamp switch (on/off signal) From
18 0.5 Blue/Yellow Auto lights switch From
19 - - - -
20 0.5 White Infra red / Radio key receiver data link Both
31 0.35 Green Aircon second stage from triangle To
32 0.35 Black/Red Rear window (and electric wing mirror) heater switch from triangle To
33 0.5 Red/Yellow Rear fog light switch signal from headlight stalk To
34 0.5 Yellow High beam flash signal from headlight stalk (stalk pulled back) To
35 0.5 Yellow/Green Low beam signal from headlight stalk (stalk twisted to 2nd position) To
36 0.5 Green/Blue Wiper stalk in slow constant wipe position (up one position) To
37 0.5 Yellow/Black Fog light switch From
38 0.5 Blue Right indicators from headlight stalk To
39 0.5 Black/Green Left indicators from headlight stalk To
40 0.5 Red/Green Washer pump signal from wiper stalk (stalk pulled back) To
N11-10 Wire Size Wire Colour Fuse No. Fuse Rating Function To/From SAM
1

1.0

Brown

- - Ground From
2 1.5 White - - Aircon compressor From
3 2.5 Brown/Green - - Front radiator fan From
4

1.0

Grey/Blue

31

30

Central locking (doors & fuel cover) Lock/Unlock Both
5 1.0 White/Blue 31 30 Central locking (doors & fuel cover) Lock/Unlock Both
6 1.5 Blue/Red 31 30 Horn From
7 1.5 Yellow 15 15 Intercooler / Chargecooler fan From
8 0.5 Red 31 30 Boot release  solenoid From
N11-11 Wire Size Wire Colour Fuse No. Fuse Rating Function To/From SAM
1 16.0 Red - - Main supply from battery  To
R Wire Size Wire Colour Fuse No. Fuse Rating Function To/From SAM
R1 - - - - - -
R2 - - - - - -
R3 - - - - - -
R4 - - - - - -
R5 - - - - - -
R6 - - - - - -
R7 - - - - - -
R8 - - - - - -
R9 1.5
1.5
Red
Red

44

25 Heated seats From

When tracing the wiring, we found the following spliced wiring for N11-10. In this case, the wiring colours from the above table apply after the splices and not immediately after the SAM connector:


To access the wiring connectors for N11-8 and N11-9, you need to remove the outer casing. Pins 1-20 are attached to a grey connector with Pins 31-40 in a black connector. Each of these are held in the outer case with two white clips indicated below. Use a small screwdriver to push these back whilst pulling the wiring gently.

The connectors should now slide out of the case.

In case you forget which way round the connectors fit into the outer case, each one is labelled with its pin value and a direction arrow. The connectors are slid into the case in the direction of the arrow where they will click back into place.

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