How to test and repair your AC Dash Switch on your Mazda B2000 B2200 or 2600. Most of the time, it just needs a good cleaning.
Part Number for Switch if you need to replace it is UB39-61-550
Using a multimeter, there should be continuity between the LY and LW wires (blue/yellow and blue/white) when the switch is pushed in.
I figured out (again) how to take these apart. I think the key is to remove the two tiny bulbs first, then push in the two little tabs, then gently pull/pry out.
Inside, not too complicated. If one takes apart the switch carefully with the light bulb side down, then pretty straightforward to see how everything should go.
There are two metal contacts which might have some old grease on them. On the switch part itself is a little U-shaped piece of metal that completes the circuit between those contacts when the switch is pushed in.
There’s a spring which pushed the button rearwards. There’s also a little spring which operates the push-in-push out mechanism. So once it’s cleaned, put back together, slide the housing over it, put the bulbs back in place, test for continuity between LY and LW wires again when the switch is clicked down.
I also cleaned the contacts for the bulbs with a little steel wool, some were dirty, others nice. So 30 minutes to do the first one, then 5 minutes each to repair the other four, typical for stuff like this.
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