Central Locking Advice Needed

[thom4782]

The remote locked both doors when I tried it.

I'd add one more thought to my original post. I can say this happens with 100% certainty, but the condition seems to clear if I double click the remote or double lock the door using the key. I'm leaning toward the passenger compartment sensor, but it still a guess.

[sb01box]

Originally Posted by thom4782

The remote locked both doors when I tried it.

I'd add one more thought to my original post. I can say this happens with 100% certainty, but the condition seems to clear if I double click the remote or double lock the door using the key. I'm leaning toward the passenger compartment sensor, but it still a guess.

I think you are having the SAME problem that I had with my 01 box some two, three years ago.
on my car, the passenger door mechanism was defective. cold solder joint on the printed wiring board. wiggling the harness to the door mechanism resulted in intermittent operation of the lock LED and also able/unable to lock the door.