SC300 & SC400

With ignition switch in START position, current flows to Park/Neutral Position (PNP) switch. PNP switch prevents the starter from operating if the transmission is in gear. Current flows through the starter relay coil and is grounded at theft deterrent and door lock control ECU. This energizes the starter relay, allowing battery power to the starter solenoid. The starter solenoid engages, allowing current to flow through starter motor field coils.