Rostra REARSIGHT OnStar 250-8822 Installation Instructions

REARSIGHT OnStar Compatible Mirror Adapter Harness 250-8822
Vehicle Preparation
Before beginning your installation, familiarize yourself with the installation instructions and the harness and
RearSight Mirror system components.
To ensure your safety, (A) apply the emergency brake and (B) read this entire manual before beginning.
CAUTION: It is advisable to disconnect the negative battery cable for 3 minutes before
beginning installation to avoid unintended air bag deployment. Note and record any anti-theft
radio codes prior to disconnecting.
NOTE: THIS HARNESS IS ONLY COMPATIBLE WITH ROSTRA 250-8820 AND
Installation:
1. Locate the supplied mirror adapter harness.
2. Determine if you are replacing an OnStar equipped mirror that has Temp and Compass or does not.
NOTE: The video signal wires are reversed in these two different models. See the chart below and
follow instructions for connecting the video wires.
3. After confirming the application and consulting the chart below for proper connection, insert the
video positive (yellow) and negative (grey) leads into the mirror adapter harness open ports as
listed below. Do not force the connectors, they will slide in and lock in place.
4. Connect the mirror extension harness to the mirror.
5. Attach the mirror to the factory windshield lug securing it in place by tightening its mounting screw
to the lug.
6. Connect the adapter harness to the factory wire harness. Place the wiring above/behind the roof
liner /trim.
Testing
1. Reconnect the negative battery cable and torque to 3 ft-lbs.
2. Re-enter any theft deterrent information (if applicable).
3. Turn the ignition switch to the ON position.
4. Shift the vehicle into reverse and confirm video feed to your device.
Reassembly
1. Once the video is confirmed to be displaying in the mirror when in reverse, attach the new mirror to
the windshield.
2. Reinstall all trim pieces taking special care to ensure harnesses and wiring connections are properly
secured.
3. Make sure no harnesses are bent or pinched by trim pieces.
All Rights Reserved 7/2017 Rostra Accessories, Inc. 800-782-3379 – www.rostra.com
250-8821 ONSTAR COMPATIBLE MIRRORS.
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