How to Install Signal on Glass Upgrade Kit on 2019+ Style Chevy/GMC Tow Mirrors
2019+ Silverado or Sierra Trucks
The instructions below will cover the Installation of GM Tow Mirror Signal on Glass Upgrade Kit on 2019+ GM Chevrolet/GMC tow mirrors. This procedure applies to OEM Silverado and Sierra mirrors. This kit adds an integrated red turn signal to your upper mirror glass for added safety and visibility. Installation will only take minutes with our included wiring adapter making this a fully plug and play upgrade kit.
Boost Auto Parts also offers other tow mirror parts and accessories such as our Plug and Play Heated Lower Glass upgrade kit for 2019+ Style GM Tow Mirrors. Find all vehicle parts, harnesses, and upgrades here.
Vehicle Fitment: 2019, 2020, 2021, 2022 Chevrolet Silverado & GMC Sierra 1500 Trucks, 2020, 2021, 2022 Chevrolet Silverado & GMC Sierra 2500 and 3500 Trucks
Replacement upgrade for GM OEM numbers: 84753945, 84753944, 84301410, 84301411, 84819559, & 84819560
For detailed installation instructions refer to the links below
Link to installation manual: 2019+ GM Tow Mirror Signal on Glass Upgrade Kit Installation
Link to installation video: Add Signal On Glass - GM OEM Tow Mirror Upgrade Kit (2019+ Style Silverado/Sierra Tow Mirrors)
Full Installation Video:
Remove the upper and lower glass by reaching behind and pulling them away from the mirror. Unplug all connections from the back of your upper and lower glass.
Heated Lower Glass
If you have heated lower glass, unplug all connections from the back of your upper and lower glass. If you do not have this upgrade kit installed, this would be a good time to do so, as you will be already removing the upper and lower glass. Purchase our heated lower glass upgrade kit here.
Remove the four T15 screws that hold the shroud in place.
Remove the shroud and the lower cap. Unplug the rear facing cargo light (if equipped).
Extend the mirror out half-way. The mirror will slide forward slightly when extended.
Use a T15 bit to remove the four screws retaining the motor. If needed, tilt the motor to gain better access to the screws as shown below.
Remove the two additional T15 screws.
Unplug the marker light harness.
Plug the male 4 pin connector into the front
marker light wiring harness.
Plug the female 4 pin connector into the back of the marker light.
Route the 2 pin signal on glass connector in between the rear shroud and the mirror housing. The connector should come through this portion of the mirror.
Telescope the mirror all the way in.
Replace the two T15 screws.
Line up the lower cap with the mirror, then plug the connector for the cargo light back into light on the shroud (if equipped).
Making sure none of the wires are pinched, route the wires for auto dim and blind spot monitoring (if equipped), signal on glass, and defrost through their respective openings on
the front shroud.
Line up the front shroud and replace the four T15 screws.
Plug the power adjust motor back in, the
connector is keyed and can only be plugged in one way
Being careful not to pinch any harnesses, line up the screw bosses and replace the four T15 screws that hold the power adjust motor into place.
Before installing the upper glass, be sure to plug in the wires for the blind spot monitoring, auto dim, defrost, and signal on glass if your mirror is equipped with those features.
Be sure to tuck away any wires or harnesses, then align the stabilization pins and use your hand to snap the upper glass into place.
If you have the Boost Auto Parts heated lower glass kit, plug in the defrost wires on the lower glass. Then, use the palm of your hand to snap in the lower glass.
Your Installation is now complete!
For supplemental and full in depth instructions, please reference our Installation Manual or Installation Video listed below. If you have any questions about this product please reach out to our sales team by phone or email here.
Install Manual: 2019+ GM Tow Mirror Signal on Glass Upgrade Kit Installation