BlackOutRST

I'm going to add this in the hope it helps. I've looked everywhere for a way to work this out. I have a 2019 RST and adding the light bar to the high beams was a dream compared to this. We just put my wife in a 2022 Yukon and like you all, I hit a wall. I have not tried this yet but, wanted to add it here for you take look at before I forgot to add it. It's the closest thing I can find that gave me some direction: I'm not saying this is right, so explore at your owe risk but, I'm going to check it out and report back (unless I set my wife's car on fire and you never hear from me again). I'd love for us to all find a solution for the group. Considerations Electrical Load: Ensure the additional devices do not exceed the module’s designed load. Compatibility: Verify that the ELM firmware won't block non-standard devices. Warranty Impact: Tapping into the ELM may void your vehicle's warranty. Adding Relays for High-Load Accessories: If you're adding high-powered lights (e.g., off-road LED bars), use the ELM output to trigger a relay, with the actual power drawn from the battery or an auxiliary power source. Using Auxiliary Control Modules: Some aftermarket systems integrate with OEM lighting modules via a CAN bus interface, allowing advanced functionality without splicing wires (e.g., app-controlled lighting, custom sequences). Steps to Identify and Use the Output: Locate the ELM and Wiring Diagram: The ELM is typically found in the fuse block or near the vehicle's lighting control unit. Obtain the factory wiring diagram for the ELM (usually available in the service manual or online). Identify the High-Beam Trigger Output: Look for the pin or wire labeled for high-beam output. This wire provides a signal (likely 12V) when the high beams are activated. Connect to the Relay: Use the high-beam output to trigger a relay. The relay protects the ELM from excessive current draw. Wire the lightbar's positive lead to the relay's output terminal, with the power coming directly from the battery (fused). Example Pin Description: In a typical wiring scenario: High-Beam Signal Output Pin: Sends 12V when high beams are activated (consult the service manual for exact pin and wire color). Ground: Connect the relay's ground pin to a suitable chassis ground. Relay Trigger: Connect the high-beam signal output to the relay's trigger input. Detailed Relay Wiring: Relay Terminals: 85 (Trigger Input): Connect to the ELM's high-beam output wire. 86 (Ground): Connect to a chassis ground. 30 (Power Source): Connect to a fused power source (e.g., the battery). 87 (Output to Lightbar): Connect to the positive lead of the lightbar. Lightbar Ground: Connect the lightbar's ground wire to the vehicle's chassis ground. Why Use the High-Beam Output? This ensures the lightbar operates only when the high beams are on, maintaining compliance with road regulations in many regions. Caution: Verify the maximum load the ELM can handle to avoid overloading. Use a relay-rated fuse between the power source and the relay to protect the circuit. If unsure, consult a professional installer to avoid damaging your vehicle's electrical system.