How is the vacuum pump in boot not working?
There are few things to check why it's not working?
- fuse (as suggested)
- does it work from either of outside locks?
- does it come to life when you push down or pull up door pins?
- if still no luck then take the pump out, dismantle and check for moisture or corrosion on the PCB. This is quite often soaking wet if it is down in the spare wheel section and you had a leak somewhere, but also likes to corrode from just humidity.
- if corroded clean the PCB with some iso propyl alcohol (you can also use PCB cleaner from Maplins or elsewhere) using a toothbrush
- if board is clear measure if you get voltage to the supply line. (either use multimeter or a 5 or 10W 12V lamp)
still no luck?
-check for cold solder spots on the PCB and resolder connections if suspicious.
- check that you get a signal from the door micro switch on each side to the plug on the pump (this needs a multimeter as lamp may draw too much current for the small switch), see diagram above for wire colours.
if you get signal and voltages to there then the pump PCB will have a faulty component but I don't think that will be the case, normally it's just corrosion.
Should the pump pcb or pump mechanics be faulty just get a replacement from scrappy.... don't bother with the cheap motor driven central locking things off ebay (cheap parts often mechanically break).
remote addition to the original VW system is most reliable.
