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OBD Connections
The wiring connections to and from the OBD (Data Link Connector).
OBD Socket Location

600cc smart - on the visible side of the fuse box under the dashboard.
700cc smart - in the cubby hole nearest the door on the driver's side.
Roadster - Hidden by a removable panel directly below the steering wheel.
999cc smart - in front of the driver's knee nearest to the centre of the car under the dash.

The 700cc and 999cc smart have flap down covers that protect the socket.

600cc And 700cc Smart

The table below shows the connections to and from the OBD.
It shows that each controller has its own diagnostics line which is used by
the Mercedes Star Machine or the 3rd party Win-star system.


Pin 1
SAM unit connection 9, pin 3. Diagnostics
Pin 2
No connection
Pin 3
ECU pin 102. TNA
Pin 4
Negative earth
Pin 5
Negative earth
Pin 6
No connection
Pin 7
ECU pin 110. K-line, Diagnostics
Pin 8
Battery positive connection, fuse 20
Pin 9
ESP unit pin 11. Diagnostics
Pin 10
No connection
Pin 11
Steering assist unit, connection B, pin 2. Diagnostics
Pin 12
Restraint systems/Airbag controller pin 9. Diagnostics
Pin 13
No connection
Pin 14
No connection
Pin 15
No connection
Pin 16
Battery positive connection, fuse 11

The G1 smart uses ISO 14230-4 to transmit data to the OBD.

999cc Smart


Pin 1
No connection
Pin 2
No connection
Pin 3
No connection
Pin 4
Negative earth
Pin 5
Negative earth
Pin 6
CAN high
Pin 7
No connection
Pin 8
Battery positive connection
Pin 9
No connection
Pin 10
No connection
Pin 11
No connection
Pin 12
No connection
Pin 13
No connection
Pin 14
CAN low
Pin 15
No connection
Pin 16
Battery positive connection

The G2 smart uses ISO 15765-4 CAN to transmit data to the OBD.


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