Hi, I have a 1998 E300TD Avantgarde and the central locking has started to play up. When unlocking the car with the key only the drivers door and fuelflap unlock. All other doors will not open even when pressing dashboard switch. The boot will open with the key fob. The drivers door, boot and fuel flap will lock with the key. Any help would be greatly appreciated. Thanks, FrankB.

 

Since some doors work and others not it is likely the PSE (Pneumatic Security Module) pump or associated tubing.
Has there been any accident damage that could have damaged the tubing from the PSE (yellow)?

Only concern is that although the PSE has individual outlets on it for each door etc I believed that they were all interconnected within the PSE and worked simultaneously.
This potentially takes us back to the start.

Suggest you get the PSE codes read at a garage with special equipmentread since this may provide some further info.

Still think it is likely the PSE but too expensive to change on the data currently available.

Stuart