| Wire Color | Standard Function | Connection Point in Vehicle | | :--- | :--- | :--- | | | Main Power (12V Constant) | Direct to Positive battery terminal or Constant power at ignition harness. | | Black | Chassis Ground | Bare metal frame ground (sand any paint off). | | Yellow | Ignition Switched Power (12V IGN) | Wire that receives 12V only when key is in "RUN" or "ACC" position. | | White | Starter Kill (Normally Closed) | Cut the vehicle's starter wire. Connect White to the Key Side of the cut. | | Green | Starter Kill (Normally Open) | Cut the vehicle's starter wire. Connect Green to the Starter Motor Side of the cut. | | Blue | Tach / Data Link (Optional) | Connects to negative side of ignition coil (gas) or Glow plug light (diesel). |
An Intoxalock system consists of two primary hardware sections: the in-cab handheld breathalyzer unit and the under-dash engine control module (relay box). The system works fundamentally by acting as an electronic gatekeeper placed in series with the vehicle's starter circuit. Ignition Interlock Device Intoxalock Wiring Diagram
For newer vehicles (2015+ with CAN bus or push-to-start), two additional wires are used: | Wire Color | Standard Function | Connection
The Ignition Interlock Device is not a standalone gadget; it is an integrated security system that communicates directly with your vehicle’s starter and ignition systems. The wiring diagram serves as the roadmap for this integration. Here is why it matters: | | White | Starter Kill (Normally Closed)