Picking an input
The Kill Switch Wiring node is where you tell the Nexus which input the switch is on. Any spare AVI (analog voltage input) or SPI (synchronized pulsed input) will do, and you can also use a button on a CAN keypad such as the 8-button CAN keypad, which saves running another wire to the dash. Click Edit to assign or change the input, or Clear to remove the assignment. How the ECU responds once the switch is active is set in the main Kill Switch function.
Input settings
| Setting | What it does | Our advice |
|---|---|---|
| Switch On Voltage | Input voltage above which the switch counts as on (0.0 to 5.0 V) | Log the input in both positions and set it comfortably between them |
| Switch Off Voltage | Input voltage below which it counts as off (0.0 to 5.0 V) | Keep a clear gap below the on voltage so noise can't flicker it |
| Pull-up | Adds a 1k ohm resistor to 5 V on the input | Turn on for a simple switch to ground, so the input reads high when the switch is open |
Check it before you rely on it
With the ignition on and the engine off, flip the switch and watch the input in NSP. It should change state cleanly and stay put. Then test it with the engine idling. A kill switch you've never tested isn't a safety device. If you want a hand planning the wiring, contact us.
