Having that issue with my 00 Yukon. Bought Brand new AC Delco Mode Actuator P/N; 52473356 moved about a half turn then stopped. Swapped my spare actuator from my Tahoe into the Yukon no movement at all swapped it back into the tahoe now it won't work at all. New Delco actuator wont work in the...
The middle one says Air which is probably for a Air Pump which these trucks do not have. for some reason no fuses were ever installed. I went to a GM dealer and they had none of these fuses in stock.
2nd Pic is a Crossover. Look it up for more info. I would start over with a newer system. I was lucky had the stock system never messed with. replacing all my speakers with new ones and going with a new in dash stereo.
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