GMC 84108211 Mirror Assembly, Outside Rear View *Black

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If the mirrors don't operate as expected, you can perform several checks: With the ignition in the ACC position and the engine off, operate the mirror control switch through all functions for both left and right side mirrors. Listen for the sound of the electric motors inside the mirrors. If you hear the motors but the mirror glass doesn't move, there might be a problem with the drive mechanism inside the mirror. In such cases, the defective mirror must be replaced as a unit. If there is no sound coming from the mirrors and they don't operate, first check the fuses. If the fuses are okay, proceed with further diagnosis. Remove the mirror control switch and have its continuity checked by a dealer service department or qualified shop. Check the ground connections. If the mirror still doesn't work, remove the mirror and check the wires at the mirror for voltage. If there's no voltage in each switch position, check the circuit between the mirror and control switch for opens and shorts. If there is voltage, remove the mirror and test it off the vehicle with jumper wires. Replace the mirror if it fails this test.

If the mount plate has come off the windshield, you can use adhesive kits available at auto parts stores to resecure it. Follow the instructions included with the kit and make sure to position the flanged part of the mount away from the glass and the narrower part pointing up.