I know, it does sound strange. There is definitely some liquid between the
glass and the backing. There is a strip of metal along the bottom of the
glass and I assume this heats to warm the liquid to defrost the mirror.
If it is like the mirrors on my 2002 Envoy, the drivers side is an
electro-chromic glass. It darkens with the application of a small amount of
voltage, approx 1 1/2 volts that is sent from the inside rear view mirror
On the back of the mirror, you will find two electrical connectors. If you
disconnect these, the glass should go to clear. If it doesn't, there is a
problem with the glass. If it does, the problem then may be in the sensing
circuit. Check to see if your interior auto-sensing mirror is dark? Have you
added anything that would block the light sensors? There are two, one on
each side of the inside rearview mirror.
The glass itself is not a service part on the Envoys, you have to purchase
the entire mirror assembly. Might check ebay if this becomes necessary.
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