The 456G converts the signals from keyless entry, alarm, and remote start systems directly into signals that can be understood by the vehicle's data bus system.

This allows interfacing with the factory security and lock system through the existing factory data wire in the vehicle.

The 456G also operates the smart dome light integration on some vehicles.

The DEI 456G harness wires connect to the DEI (or other brand) CPU alarm, keyless entry, or remote start Door Lock / Unlock Outputs and the Door Trigger Input if you are installing an alarm. Then connect the DEI 456G Data Bus Output to the vehicle's Data Bus wire at the Diagnostics Connector located at the bottom of the dash on the driver's side. That's it! It's that easy.

The alternative to using the DEI 456G GM Data Interface on 2003+ Full size Trucks and SUV’s is to make the traditional +/- door lock / unlock inside the individual doors. You will also need 4 – DEI 8617 40 amp relays for 2 door models, and 5 – DEI 8617 40 amp relays for 4 door models. To check this out, we have included the wiring diagram for doing this at the end of this page.