GMC 20873491 Mirror, Outside Rear View (Reflector Glass & Backing Plate)

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For outside mirrors,Remove the small interior trim panel that covers the mirror's mounting nuts. On 2010 and later Equinox models, the door panel and door window frame panel must be removed to access the electrical connectors for the mirrors. Remove the small insulator, then disconnect the electrical connector from the back of the mirror. Remove the mirror mounting nuts, then detach it from the vehicle. Installation is the reverse of removal. Inside mirror: Disconnect the electrical connector from the mirror, if equipped. Remove the setscrew located at the base of the mirror stalk. Slide the mirror upwards to remove it from its mount. Remove the mirror set screw, then carefully lift the mirror upwards towards the top of the glass. If the mount plate itself has come off the windshield, adhesive kits are available at auto parts stores to resecure it. Follow the instructions included with the kit. Be sure to position the flanged part of the mount away from the glass and the narrower part pointing up.

The Body Control Module (BCM) governs several systems in these models, including the door locks, power windows, ignition lock and security system, interior lights, Daytime Running Lights system, horn, windshield wipers, heating/air conditioning system, and power mirrors.

To remove the inside mirror from its mount, you need to remove the setscrew located at the base of the mirror stalk and then slide the mirror upwards.

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.