2021 GMC Sierra 1500 Owners Manual - Exterior Mirrors

Exterior Mirrors

Standard Mirrors

The passenger side mirror is convex shaped. A convex mirror's surface is curved so more can be seen from the driver seat.

Trailer-Tow Mirrors

The upper portion of both the driver and passenger mirrors is flat.

The lower portion of both the driver and passenger mirrors is convex. A convex mirror’s surface is curved so more can be seen from the driver seat. The lower portion is adjusted manually.

If equipped, adjust manual mirrors by moving the mirror up and down or left to right to see a little of the side of the vehicle and to have a clear view behind the vehicle.

Using hood-mounted air deflectors and add-on convex mirror attachments could decrease mirror performance.

Extending Mirrors

Trailer tow mirrors can extend out for better visibility when towing a trailer.

Manual Extend : If equipped, grasp the mirror housing firmly and pull back in one motion, arching slightly toward the rear of the vehicle.

To return the mirror to its original position, reverse the motion.

Power Extend : If equipped, press the power extend button to fully extend the mirror.

Press again to retract.

Resetting the Power Extend Mirrors

Reset the power extend mirrors if:

The mirrors are accidentally obstructed while extending/retracting.

The mirrors are accidentally manually extended/retracted.

The mirrors vibrate at normal driving speeds.

If a popping noise from the mirror is heard, this sound is normal as the manual detents are aligning after a manual extend/retract operation has occurred.

Auxiliary Cargo Mirror Lamps

If equipped, cargo mirror lamps face rearward to provide more light on the sides of the vehicle, if needed. See Exterior Cargo Lamps 0 143.

Advanced Trailering Vision System Side Cameras

If equipped, the Advanced Trailering Vision System side cameras are on the bottom of the outside mirrors. See "Surround Vision (360 Degrees)" under Assistance Systems for Parking or Backing 0 265.

To adjust each mirror:

Press j or | to select the driver or passenger side mirror. The indicator light will illuminate.

Press the arrows on the control pad to move the mirror in the desired direction.

Adjust each outside mirror so that a little of the vehicle and the area behind it can be seen.

Press j or | again to deselect the mirror.

Turn Signal Indicator

If equipped, the mirror has turn signal indicator lights, which flash in the direction of the turn or lane change.

Task Lighting

If equipped, task lighting projects light from the outside mirrors to the sides of the vehicle. See Task Lighting 0 143.

Puddle Lamps

If equipped, puddle lamps project light from the bottom of the mirror to the area of ground below the driver and passenger doors. See Entry Lighting 0 145 and

Exit Lighting 0 145.

Memory Mirrors

The vehicle may have memory mirrors. See

Memory Seats 0 49.

Lane Change Alert (LCA)

The vehicle may have LCA. See Lane Change Alert (LCA) 0 278.

If equipped, push the mirror toward the vehicle to fold. Push the mirror outward to return to its original position.

Manually fold the mirrors inward to prevent damage when going through an automatic car wash.

If equipped, press g to power fold the mirrors. Press again to unfold.

Resetting the Power Folding Mirrors

Reset the power folding mirrors if:

The mirrors are accidentally obstructed while folding.

The mirrors are accidentally manually folded/unfolded.

The mirrors will not stay in the unfolded position.

The mirrors vibrate at normal driving speeds.

Fold and unfold the mirrors one time using the mirror controls to reset them to their normal position. A noise may be heard during the resetting of the power folding mirrors. This sound is normal after a manual folding operation.

If equipped, press and hold Q on the RKE transmitter for approximately one second to remotely fold the exterior mirrors. Press and

hold K on the RKE transmitter for approximately one second to unfold. See Remote Keyless Entry (RKE) System Operation (Key Access) 0 10 or

Remote Keyless Entry (RKE) System Operation (Keyless Access) 0 13.

This feature can be turned on or off. See

Vehicle Personalization 0 130.

If equipped with heated mirrors:

1 REAR : Press to heat the outside mirrors.

See "Rear Window Defogger" under Dual Automatic Climate Control System 0 205.

If equipped, the driver outside mirror automatically adjusts for the glare of the headlamps from behind. This feature comes on when the vehicle is started.

If equipped, there is a small convex mirror built into the upper and outer corner of the driver outside mirror. It can show objects that may be in the vehicle's blind zone.

Actual Mirror View

When the approaching vehicle is a long distance away, the image in the main mirror is small and near the inboard edge of the mirror.

As the vehicle gets closer, the image in the main mirror gets larger and moves outboard.

As the vehicle enters the blind zone, the image transitions from the main mirror to the blind spot mirror.

When the vehicle is in the blind zone, the image only appears in the blind spot mirror.

Set the main mirror so that the side of the vehicle can just be seen and the blind spot mirror has an

unobstructed view.

When checking for traffic or before changing a lane, look at the main driver/ passenger side mirror to observe traffic in the adjacent lane, behind your vehicle. Check the blind spot mirror for a vehicle in the blind zone. Then, glance over your shoulder to double check before moving slowly into the adjacent lane.

If equipped with reverse tilt mirrors and memory seats, the passenger and/or driver mirror tilts to a preselected position when the vehicle is in R (Reverse). This allows the curb to be seen when parallel parking.

The mirror(s) may move from their tilted position when:

The vehicle is shifted out of R (Reverse), or remains in R (Reverse) for about

30 seconds.

The vehicle is turned off.

The vehicle is driven in R (Reverse) above a set speed.

To turn this feature on or off, see Vehicle Personalization 0 130.