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There are two fuses that should be checked first, both are located in the fuse panel on the lower left of the dash behind the cover. Check the 25A sunroof fuse and the 10A ECU-IGN, if they are good the remove the overhead control panel, there may be a couple of phillips screws so open any covers and look for screws, other than that it just pulls out, there are two wires that come up from those fuses that should have battery voltage, one is blue/white the other is black/red, unplug the connector and check for voltage with either a test light or voltmeter, if there is voltage then the overhead control unit may need to be replaced.