Battery voltage is applied through the TAIL DOME fuse at all times to the ignition key warning switch. When the ignition key is inserted into the ignition cylinder, the ignition key warning switch closes and a voltage signal is provided to the audio alarm module. If the LH (front) door is opened, the LH (front) door jamb switch closes and a ground signal is provided to the audio alarm module. When these two signals are received, the audio alarm module activates the ignition key warning alarm (approximately 2 pulses per second).

Battery voltage is applied at all times from the TAIL DOME fuse to headlamp relay 2. When the headlamp switch is in the PARK or HEAD positions, ground is provided for the coil in headlamp relay 2 through the combination switch to G201. This ground energizes the coil, closing the contacts in headlamp relay 2 and providing battery voltage to the audio alarm module. A voltage signal is also received by the audio alarm module by the IG COIL METER fuse if the ignition switch is in the ON or START positions. It the audio alarm module receives a lights ON signal and a door open signal but no ignition key signal, it will activate the headlamp warning alarm (approximately one pulse per second).

The audio alarm module and the seat belt indicator receive battery voltage through the IG-COIL METER fuse whenever the ignition is in the ON or START positions. If the driver's seat belt is not buckled, a ground path is provided to the seat belt indicator and the audio alarm module through the closed contacts in the seat belt switch to G300. When both of these signals are received the seat belt indicator illuminates and the audio alarm module activates the seat belt warning alarm (approximately 2 pulses per second) for approximately 6 seconds.