Thanks for a great guide. I had all sorts of symptoms going on: Lack of rear washer pressure, alarm going off randomly, no indicator flash when alarm set, rear wiper misbehaving, Luggage compartment open warning on dash... All down to leaky rear washer dripping on boot latch.
Having worked through this, I just wanted to elaborate on a couple of things:
1. The size of spline bit required is an mate and you can pick one up from eBay for £0.99.
2. Its impossible to "Fry" a micro-switch. Micro-switches are mechanical devices with electrical contacts in them. When they are adjusted mechanically then they will either create a short circuit or open circuit.
The one fitted to the boot latch has two sets of contactors in it. I am assuming that one is for the boot interior light and the other to tell the ECU if the boots open or closed.
If either or both of these functions stop working, there is a simple fix:
- Remove the bootlatch.
- Spray lots of WD40 on the connector and on the micro-switch itself.
- Clean up connector.
- work the micro-switch back and forward, keep adding WD40 ensuring that its soaking into (Yes actually inside) the micro-switch.
Use a multi-meter to ensure that on the bootlatch connector, the centre pin to each side pin is short circuit, then push the micro-switch in and ensure that the centre pin to each side pin goes open circuit. If its not, more WD40, more working the switch, more cleaning the connector.
Unless the micro-switch has literally fallen apart, it should be (and was in my case) that simple to get the bootlatch micro-switch working properly again.
Hope this helps