1989 Other BMW Models trip computer

VOLVOMAN2002

MEMBER
1989 BMW
6 CYL
2WD
AUTOMATIC
190,000 MILES

I have a 89 bmw 735il that I had to jump because I left the headlights on when I started the car my trip computer now shows all p's none of the buttons respond except for the s/r button which now chimes when u press it and idea how to get it working again?

1 Reply

DOCHAGERTY

MECHANIC
9,601 POSTS

You may have done some damage to the electrical system by jump starting the car. Never jump start an electronically sophisticated car like a BMW. In order to see if the on board computer survived this possible over voltage scenario, remove the radio and release the OBC from it's socket (there is a lever in there, pull it, and the OBC pops out) wait till the count of ten, plug it back in and see if it comes back to life. If in the future, you, or anybody who reads this post, DO NOT JUMP START BMW CARS, AT ANY TIME. If the battery will not start the car, remove it, charge or replace the battery and then start the car, jump starting can cause a great deal of mischief, just don't do it.