Help with electrical problem
Thread Starter
Intermediate
Joined: Mar 2004
Posts: 31
Likes: 0
From: Pensacola Florida
Help with electrical problem
Please help need what ever info you can think of.
last night i left the rear hatch cracked, it rained,
, the front floor boards were soaked. i have not powere in the acc position but when i go to run all the gauges light up and the dic works, but the car wont start, no radio door locks windows etc. dont know where to start asside from un hooking the battey and drying everything out. please help. 
last night i left the rear hatch cracked, it rained,
, the front floor boards were soaked. i have not powere in the acc position but when i go to run all the gauges light up and the dic works, but the car wont start, no radio door locks windows etc. dont know where to start asside from un hooking the battey and drying everything out. please help.
Last edited by bmwdiver; Oct 27, 2004 at 07:06 PM. Reason: changed the notification settings
Instructor
Joined: Dec 1999
Posts: 211
Likes: 1
The body control module is under the front of the passenger floor board. It's responsible for the retained accessory power modes that happen when the key is in ACC. If it were hosed, you'd see symptoms like you see.
If the body control module is still good, there could be another module on the OBDII serial data bus that could be disrupting communications. In this case, the car still would not start because the BCM and PCM would not be able to exchange the VTD passwords. I'll bet if you hit the lock button on the driver door, the driver door will lock, but the passenger door will not. From the keyless remote, neither door should respond. Also, when you start the car, the starter probably turns, but then it dies immediately. Does this match what you see?
Good luck!
-Michael
Oh, it's good to not have power on wet circuits. The circuits tend to corrode and damage themselves very quickly. Drying it is a good idea.
If the body control module is still good, there could be another module on the OBDII serial data bus that could be disrupting communications. In this case, the car still would not start because the BCM and PCM would not be able to exchange the VTD passwords. I'll bet if you hit the lock button on the driver door, the driver door will lock, but the passenger door will not. From the keyless remote, neither door should respond. Also, when you start the car, the starter probably turns, but then it dies immediately. Does this match what you see?
Good luck!
-Michael
Oh, it's good to not have power on wet circuits. The circuits tend to corrode and damage themselves very quickly. Drying it is a good idea.
Last edited by blader; Oct 28, 2004 at 12:37 AM.
Thread Starter
Intermediate
Joined: Mar 2004
Posts: 31
Likes: 0
From: Pensacola Florida
the door locks work from inside and the remote, but the horn doesent sound and the the trunk will not open from inside or the remote. everything else is the same except the car wont turn over at all. does that mean i need a new module? and if so where can i find one without going through dealer? thanks 
Thread Starter
Intermediate
Joined: Mar 2004
Posts: 31
Likes: 0
From: Pensacola Florida
ok the drying out of the BCM, worked for the most part. the car runs fine, and all of my functions appear to be alright except the lights dont flash and the alarm doesent set when locking the doors. but the doors lock just fine. tried the relay but no luck. any ideas
