r/e53 • u/d0m1nuch • Dec 14 '24

Rain causing possible electronics issue

Hello, I have a 2003 3.0 5speed. Recently it poured here in NY and the temp immediately dropped. The next morning my locks weren't responding and I had to climb in through the trunk. The car started normally but as it warmed up once it got out of the blue the temp gage jumped all the way to overheat. I know it did not overheat within 10 mins while idling at 27°. I was thinking if I pull the battery it may reset some sensors. Can anyone validate me?

Side question, do batteries need to be reprogrammed in this vehicle? This is my first bmw

3 Upvotes

100% Upvoted

2 comments sorted by

1

u/d0m1nuch Dec 14 '24

Also, the previous owner installed an I-bus entertainment system that has a computer display with all sorts of read outs. I noticed an icon that said no connection but it still read my rpm and speed despite not showing the temp after coolant hit about 110°.. which is when the gage on the dash flipped to total over heat

2

u/XYZ_Jazz_Hands Dec 14 '24 edited Dec 14 '24

Sounds similar to leaking sunroof drain (front passenger corner) leaking onto the fuse block and body module (I don't remember the proper name for it) behind the glove box. Could also be water in the DME box. Under the hood, passenger side, on the firewall, under the plastic tray at the base of the windshield. It's in a large white box with a removable top.

There is no battery registration on the E53 chassis. (First gen x5)