I installed an after market head unit in my truck, after it was installed my speedometer, wipers, dash and dome lights stopped working.
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1999 Mazda B2500 Question: wipers wont work
Answer #1Superbob March 11, 2011, 12:35Master
In your truck, the speedo, wopers, dash gauges and dome lights, hood light, etc are controlled by the GEM (generic electronic module). I think you have a fuse blown or a loose connector related to the cylinder head work. check for stuff like that. You may need a Mazda/Ford specialist for help with this.
To access the software in the GEM, you need a scanner so you may need to find a specialiist. I don't think there's any reason for the GEM to act up but rather that the thing's not powered up or something.
If you want to find a specialsit, here's a directory link for you: