I'm sorry if this is a repeat thread...I have a 2004 TSX no navi and been having some issues with the auto door locks. The door locks will enage when the car is running and in park...say if I was going to warm-up the car and run back inside my house. Also, the locks no longer engage (automatic lock) when I drive over 10 mph. Last summer I replaced the driver's side actuator. Any insight would be appreciated.

 

As far as I know, the TSX doesn't auto-lock the car if you drive over 10 mph, unless you installed an aftermarket module from KP Technologies.

The car will lock itself after a set time, though, if you unlock the doors with your remote but don't open the doors. Perhaps the car can't tell that you've opened a door, so it has been re-locking the doors for you (and thus you thought that it would automatically lock while you're driving).

I had my actuator replaced by the dealer under warranty, though, so I don't know if its replacement could have caused issues.