How to get the high beam signal from a modular light
You can obtain a high beam signal either by tapping the high beam wire in traditional headlights or using a CAN Bus interface that outputs a 12V trigger when high beams are active.
Using a CAN Bus Interface
Modern vehicles with LED or xenon headlights often do not have a direct high beam wire. In these cases, a CAN Bus high beam interface can detect high beam activation from the vehicle's CAN Bus system and output a 12V signal suitable for controlling relays or auxiliary lights . Steps include:
- Connect the adapter to the CAN High and CAN Low lines of the vehicle.
- Provide power and ground to the module.
- The module outputs a control signal (often via a dedicated wire) when the high beam is active.
- This output can then trigger a relay to power auxiliary lights safely without modifying the vehicle's main wiring . Products like the CANM8 CANNECT HIGHBEAM interface are designed for this purpose, providing a clean 12V output when the high beam is on, compatible with most vehicles that use CAN Bus wiring .
Tapping the High Beam Wire in Traditional Headlights
For vehicles with conventional wiring, you can identify the high beam wire directly:
- Open the hood and locate the back of the headlight assembly.
- Unplug the headlight connector and identify the wires: typically ground, low beam, and high beam.
- Using a multimeter set to DC volts, connect the black probe to the chassis or battery negative.
- Touch the red probe to each pin while a friend switches the high beams on and off. The wire that shows 12V when high beams are on and 0V when off is your high beam trigger .
- Use this wire to control a relay, which then powers your auxiliary lights safely without overloading the factory wiring .
Safety Considerations
- Never connect auxiliary lights directly to the high beam wire; always use a relay to prevent overheating or damage.
- For CAN Bus systems, ensure the interface is compatible with your vehicle and follow the manufacturer's instructions to avoid voiding warranties .
- If unsure, consult a qualified auto-electrician to ensure proper installation and compliance with local regulations. By following these methods, you can reliably obtain a high beam signal from either traditional or modular lighting systems while maintaining safety and vehicle integrity.
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