BMW E36 on-board computer (OBC) and its wiring
What wires does fitting the large E36 on-board computer require?
Fitting the large 18-button on-board computer requires an outside temperature sensor, one wire to the turn signal stalk, four wires behind the instrument cluster and the 18-pin connector (X1071), which you can get from a BMW dealer. The wiring can be found in the wiring diagrams of the repair manual.
Why do speed and average consumption not show on a fitted on-board computer?
The speed signal wire is often missing. Add a wire to pin 13 of the on-board computer's black connector and take the signal from pin 2 of the cluster's blue connector. The wire is not in the white connector, and some wiring diagrams are incorrect.
Does an on-board computer from another car need to be coded?
Yes. The consumption values depend on the engine and the tank size, so the unit must be coded according to the car's data, otherwise the values are wrong. Without coding, the Check Control can report 'check control inact' at start-up.
How do I remove the on-board computer lock?
Add the month and day of the date together; for example 08.22 gives 30. Enter the sum in menu item 19 (lock off), after which the lock is removed and the menus open.