| Pin Number |
Pin Name |
Description (may be empty) |
| 1 | +12V | Power |
| 2 | GND | Ground |
| 3 | K-Line | diagnostic k-line |
| 4 | L-Line | diagnostic l-line |
It must be on all cars equipped with Mono-Motronic (of any version) ECU and on all equipped with 096 automatic transmission.
It is not present on most old cars with Mono-Jetronic.

