What does this thing do..?

[max_s2]

Hi guys.
As my S2 battery goes flat after few days left undriven, I've searched over the car to find why is this happening. Today noticed that there comes a clicking noise (like a relay closing/opening) near the rear-right speaker when I remove/attach battery cables, so I removed all the covering stuff and found this thingy (check attached picture). Anyone knows what is this and what does it do? Is it normal that this thing eats battery when not driving the car? It shows me aprox 40mA energy consumption when doors closed+locked, all lights off etc and when I disconnect this thing (three connectors), it shows me 0mA energy consumption. It also has vacuum line connected.

Any ideas?

[driftin jo]

Central locking pump

[max_s2]

Ok, thanks for the info. Next question is - should it click when battery connected to it and eat off battery?

[Mcstiff]

It should only run when locking and unlocking the car.

[shaun5]

When i bought my 95 S2 Coupe the interior light used to mess around, sometimes stay on after i had locked the car. I traced the fault to the circuit board in the centel locking pump. If you can, try another pump, think there were 2 or 3 different ones for my car.

[max_s2]

Yep it is running only when locking/unlocing, no noises when not doing it, just the clicking when attaching/detaching battery and eats energy

[shaun5]

Try taking the pump to bits and see if you can see any faults with the circuit board