BMW E34 trip computer (OBC) and coding plug
E34 trip computer shows PPPP - how is it fixed?
PPPP is a data error that stays on the display, for example after the battery has been disconnected. 1. Disconnect the battery terminal for a moment. 2. Set the time and date: press the UHR/DATE button, enter the numbers and confirm with the ST/R button. 3. Check fuse 36 under the rear seat. If the display still does not clear, the cause may be the coding plug or a faulty unit.
What is the OBC coding plug and is it needed?
The coding plug is a small memory chip from which the OBC reads the car's data. The OBC of the 520 needs the plug to work, and the 525tds requires an OBC fitted with the plug. In M20, M30 and S38 cars the plug is loose, and when the instrument cluster is replaced it is moved to the new one. A new one is available from BMW, and the order needs the last 7 digits of the VIN.
The OBC display is blank - what should be checked?
First check the OBC illumination bulbs: there are three, 1.2 W with plastic bases. The OBC is removed by taking out the radio and pulling the lever found at the upper left edge of the OBC. If the lever is stuck, push the OBC from the other side with a screwdriver.
How do I change the OBC warning messages to English, and what does the OBC measure?
Turn the ignition to position I and hold the Check Control button down until English is offered as the language. The outside temperature sensor is in the bumper under the flap next to the fog light. If average consumption does not work, check the routing of the black-and-white wire and the connection at the radio end.