Principles of Operation

Chimes and tones are produced and managed by the Lighting Control Module (LCM). The LCM provides sound for three different functions: reminder chimes, depression tones for the fuel computer switches and the electronic crash sensor (ESC) warning chime.

The reminder chime alerts the driver to conditions that require attention, such as an unfastened safety belt, the key in ignition when the driver door is open and headlamps or parklamps left on with the ignition switch in the OFF position.

When the ignition switch is turned to RUN or START from OFF or ACC, the safety belt warning chime will sound for six seconds or until the safety belt is buckled.

The safety belt warning indicator lamp will turn on for 60 seconds or until the driver seat belt is buckled. Both the chime and lamp will turn on at the same time.

If the safety belt is buckled before the ignition switch is turned to RUN or START from OFF or ACC, neither the chime nor the lamp will be activated.

The key-in-ignition warning chime will sound when the driver side door is opened with the key in the ignition and the ignition switch is in the OFF or ACC position. It will continue to sound until the key is removed, the front door is closed or the ignition switch is turned to RUN or START.

The headlamp-on reminder chime will be activated if the headlamps are on, the key is not in the ignition and the driver door is opened.

The ECS warning chime will sound when a faulty ECS module is detected. The ESC module requests a tone via a hard wired signal.