Nope, the warranty on your 2018 Audi SQ5 will absolutely not be voided if you add the Tekonsha trailer wiring harness you asked about:
- ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit # 119250KIT
Your vehicle is protected by the Federal Magnuson-Moss Warranty Act. This act says if something breaks on your vehicle and you take it in for warranty repair, the dealer must honor your warranty unless whatever you have added to your vehicle... view full answer...
The Draw-Tite Max-Frame Trailer Hitch Receiver # 75940 weighs 44 lbs. It is a confirmed fit for your 2014 Audi SQ5 Prestige. I've attached a video of the installation as well as the installation details to assist. view full answer...