The PSE(A-37) has a vacumn pump to operate the door, boot and petrol filler locks.
It also controls the alarm (if fitted) and the interior light timer, door unlock crash sensor
Plus rear demister relay and ARA control model if fitted.
It comunicates with the DAS thru the CAN from the MFC unit.
I just took mine out to check for moisture. I sprayed laquer over pcb and drilled a couple of 1.5mm holes in base as it can hold water there if it should get in. Water can overflow from blocked drains or faulty rubber boot edge seal.
(Also see post No 7 where I turned unit over
)
1. remove floor liner
2. remove spare wheel (if fitted)
3. remove jack and holder (pullup at rear)
4. pull out foam box from bottom and remove by folding top back
5. unclip vac pipes (I marked to ident. This is important)
6. unclip 2 wiring loom plugs
7. using a small flat screwdriver to push detents remove base by lifting it as you go around.
8. remove small torx screws (3)
9. let unit drop into your hand
10. inspect for water damage or corrosion (mine was OK)
11. clean if required using nylon toothbrush.
12. spray on coating to seal pcb ( I also sprayed wd40 into connectors)
13. put unit back into housing. Ensure vac tubes line up with top holes
14. replace torx
15. ensure motor stand offs are alighned with base holes and refit base plate
16. refit cable connectors
refit vac lines
17. slip into foam box NOTE: some people have wrapped a plastic bag around whole lot here. I choose not to as moisture "may" get trapped in bag?
18. manouver foam box back into its recess (bugger of a job, mine tore
19. replace jack holder and jack
20 replace wheel or box if fitted
21. replace floor covering and run hand along top of rear edge to reseat under lip.
Good luck
Bazzle
