Choosing an input
The Start/Stop Button can live on almost any spare input:
- Any free AVI (analog voltage input).
- Any free SPI (synchronized pulsed input).
- A CAN keypad button, which saves running a wire at all. The 8-button and 15-button CAN keypads both work well for this.
We usually save SPIs for frequency signals like wheel speed and put simple switches on AVIs or the keypad.
Assigning it in NSP
- Edit: choose or change the input used as the start button.
- Clear: remove the assignment and free the input.
After assigning it, press the button and check that the input changes state in NSP before you connect the starter side.
Wiring the button
Use a momentary (not latching) button, and wire it so it switches cleanly between on and off states the ECU can read. Keep the switch ground on signal ground or a clean chassis ground, not a high-current ground shared with solenoids.
Starting needs more than a button
The button only tells the Nexus you want to start. The ECU also needs a way to engage the starter; see Start Motor Wiring and Engine Control Relay, and the function settings in Start Stop Button.
