I have not seen the inside of one of these, but because of the position on the side of the tranny when internals are cleaned up might want to put some vaseline around them, to help keep water out of contacts, or dielectric grease.

I would wonder is this sort of thing could be sprayed with some rubber undercoating spray on the outside, when guys are under their trucks, to fight off water ingress....

 

I was thinking about doing something like what you stated. The new switches use to go for around $300 dollars a couple of years ago. Now they are $640. The $125 one is either used or refurbished. I rather try to clean and fix mine than buying a used on. I will also see if I can reroute the A/C drain. I hope that it is just a false contact at the plug that just needs some contact cleaner but I doubt it.

 

Heck, there a guy on this forum that just bought a whole Disco for less than that....

 

this is the best write up i have seen. i have done this procedure myself. i cleaned up where the gasket was and used a waterproof adhesive gasket maker...

so u get an idea on how filthy it is in there here is mine after i drilled it open.




Rebuild D2 ZF Selector Switch UHB100190 - Australian Land Rover Owners

 

Hard to tell from the close ups, but it looks like wires may be attached by the type of connector that cuts through the insulation, rather than a crimp on lug. If that is the case, might consider stripping and soldering those as well. If you are cleaning up the contacts, don't use a small file, it will remove too much plating.

 

Thanks for the help guys. It seems like I am finally going to be able to sort one of my trucks problems.

 

just one warning. spray the crap out of the bolt that holds the shift cable in place. and if you have to hit it with heat and then pb blaster. it is very delicate. i snapped mine and then had to replace the whole cable.

 

It is most likely NOT the XYZ switch.

A blinking M and S light alone will indicate low voltage / battery under proper voltage. The condition may be intermittent.

Replace or have your alternator and battery tested.

IF it is the XYZ switch failing as a result of drainage from the AC drains, the gear display will also show a capital D with a slash through it, and it will also be flashing in conjunction with the M and S lights.

Don't replace the XYZ switch if you don't have to. This is just from my personal experiences with the same flashing lights.

 

A blinking M & S can be other things as well, there are a number of codes that trigger limp home modes:

from the RAVE:



l

change and the warning lamps remain extinguished.

detected on a second consecutive drive cycle, the MIL illuminates.

remains extinguished.

Of course, being an over-computerized rolling tea kettle, good alternator and up to snuff battery can cure a lot of gremlins. Code list for auto trans attached, notice last column, which shows when M&S lights will be triggered by the tranny, but there could be others...

Time for tranny fluid and filter change?

 

when my xyz failed there was no slash thru the indicator.