Hi,
I have a 94 740i.
It won't start & the power locks do not work. It is not a battery problem, the engine turns but just won't start. I think it's related to the security system.

It started when I used the key to unlock the passenger door .. I think. This is where I'm fuzzy b/c I often confuse the direction. In any case I heard the doorlocks, but all the doors remained locked. I tried again, but the power locks were dead when I tried either door & the trunk.

I used the manual override procedure to open the passenger door. This got me in the car, but I could not unlock the driver door even from the inside. Also the car would not start. The windows, radio, & everything worked with the ignition turned to the On position. But if I turned the ignition off, the window would automatically shut.

After about 15 minutes of this (is this a magic waiting period?), I tried the driver side door lock & it worked electrically & auto unlocked the other doors as normal. I was then able to start the car. This was great. However, my son who was with me noticed that the passenger door could not be locked. It would not push down, nor would it go down automatically when I locked & unlocked the driver side while we were driving.

We got home & I was able to lock the car from the outside but the passenger door lock still wouldn't go down. Much worse than that though, I'm back in the same situation as when I started. After locking the car, the power locks won't work anymore & the car won't start. I can lock/unlock the passenger side using the manual procedures.

There seems to be some security system or mechanisms at work here. However the manual does not explain how to override or reset them.