In my '85 318i, the doors have a drain in the bottom of them. Mine got bent in a wreak. Hose down your window on that side, then open the door and see if you see the water running or just barely dripping. Could be plugged up. look for damaged seals around doors, if none open trunk look for dirty drain track and bad seals , also look around back window for signs seal there may be leaking. You also need to check the roof drains for the sun roof if you have one. they drain into the drip rails outside the car behind the rear glass and they do get stopped up.
behind the drivers side head
on the floor on drivers side, left of brake pedal
I am the owner of a 1998 gmc safari awd van and i am 100% sure that the computer on mine is under drivers seat. Yes under drivers seat mounted to the floor.
under the drivers side dash board, and under the hood on the drivers side right behind the battery.
The Battery is located on the drivers side... U have to take the drivers side front tire off and its located behind the plastic panel that snaps into place behind the wheel so its under the drivers side fender
Behind the radio mounted to the floor board and firewall
Behind the trim panel by the drivers left foot
Drivers side in the trunk behind the little panel on the side
In the drivers footwell , behind the kick panel . There is an access hole in the panel
In the drivers footwell , behind the kick panel ( there is an access hole )
behind the plastic splash guard behind the drivers side wheel right where the transmission meets the frame there is a mount
I have a 1998 gmc safari awd van & my pcm is located under drivers seat bolted to the floor.