Start Relay

The engine control module (ECM) controls the operation of the start relay. When the ignition switch is turned to the START position, the ECM will enable the start relay for 1 second. If the ECM does not receive the correct theft deterrent signal from the powertrain integration module (PIM), it will disable the starter relay. If the ECM receives the correct signal from the PIM, it will continue to enable the start relay. When the engine has started and the engine speed is above 500 RPM, the ECM will disable the start relay, preventing starter engagement while the engine is running.