With all the rain seems like something funky happened. Now the mirrors won't collapse at the same time and I had to reset the map for the nav system. Before I bring it in and spend lot's of money- can you explain why you think reset with a cold re-boot on battery will work? What is happening for this happen in the first place?
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you have to many variables your problem can be anything from a disconnected /damaged wire ,damaging a computer,timing belt off synch to cams out of synch eliminate the basics first -power and spark and fuel to cylinders--if these are present will have to start looking at the work you did in valve train
The green light on the A/C button flashes? This happened to my 01 Sienna. It seems to happen for me only when it's raining or I drive through a puddle. Took it to the dealer the first time it happened and they couldn't find anything wrong with it. I've had it happen a few times since and it seems to have something to do with getting something under the hood wet. When mine dries out, the A/C works again and the flashing stops. It's not very handy when I need the defroster, but there doesn't seem to be anything else I can do. Not sure if that's your situation, but that's what I've seen with mine.
you need to remove the door panel as the bolts holding on the mirror are on the inside. roll down the window.,as the door panel has to come up and out. This is easier done with the window down especially for reinstallation of the door panel. Remove the power window switch assembly ,handle, screws,and the clips that hold on the door panel.you need a flat pry tool for the clips.they pop out of the holes in the door.once the panel is off,the plug for the mirror and the nuts are removed.the new mirror and seal is replaced and the door panel re attached.
Don´t despair, it´s a nice car you got there. If it´s still under warranty, it´s probably best just to take it in for a brand repair. You probably have a short circuit within the mirror casing, with a plus cable touching the metal body work. If you take the mirror off by gently pulling it with the help of a plastic ruler, you would probably find the culprit.
This is a typical GM problem, most likely are broken wires on the driver's side door. Every time the door is opened and closed, the wires running from the door to the car body flex. Over time these wires break and cause loss of use for power options like you have. It could just be coincidental that they broke in a rain. There could be other electrical problems such as relays that have become wet and failed or a wide variety of other solutions. Electrical problems never have only one answer
The power folding function of your exterior mirrors on your '04 H2 depends on a plastic gear to collapse those mirrors at the touch of a button. That plastic gear strips very easily. The service adviser at our Hummer dealership said that problem was rectified in later model years with a redesign of of the collapsing mechanism of those mirrors.
I don't mind manually folding our mirrors, and I was afraid to ask about the cost of the parts required to solve the issue. The service guy didn't volunteer the cost of the fix. Not typically covered by aftermarket extended service/warranty plans.