W202 2000 C280 Central Locking Prob.

[Grahamcol]

Left my car unused for about 4 weeks. Started it up today and all's well except for the central locking. When I press the lock button on the remote the car will lock, but then straightaway the interior lights come on and the indicators flash rapidly. The alarm doesn't sound during this. I have tried disconnecting the battery for 30 mins which appears to help until the car is next driven when the problem occurs again. It was fine before being left for 4 weeks. Help please as I can't use the car and park it anywhere.

 

[zerocool]

had this problem before,turned out to be a door module causing a CAN bus problem

 

[Grahamcol]

Update

Just noticed that once it's acted as I originally posted, if I then unlock via the remote without opening a door, the front interior lights will immediately go out but the rear roof light remains on until I open the drivers door. Very odd.

 

[Nik_Endeavour]

Just a thought but have tried going for a long drive to charge the battery and possibly changing the batteries on the remote. Cheap and easy way of ruling out these factors.

Nik

 

[Grahamcol]

Yes Nik, I've even put another (fully charged) battery on and tried locking using the "spare" electronic key. Still the same. I've also noticed that if I manually lock the drivers door and then unlock it (using the metal key blade to do both operations) the alarm will go off as soon as I open the door. This surprises me as I didn't think the alarm was operational unless the car's locked using the remote key button. I'm forming the opinion this is really an alarm problem rather than central locking and I think I will have to contact my indie this morning to see whether he can fix. Mybe putting on star will show where the problem lies ?