Chime/Buzzer - Description

DESCRIPTION

The chime warning system uses an electromechanical transducer and an electromechanical relay that are soldered onto the circuit board of the instrument cluster also known as the Cab Compartment Node (CCN) to provide audible indications of various vehicle conditions that may require the attention of the vehicle operator or occupants. The CCN also includes the necessary hardware and software to serve as the vehicle's electronic body control module.

The electromechanical transducer generates chime tones, while the electromechanical relay generates click tones to emulate the sounds associated with conventional turn signal and hazard warning flasher operation. The microprocessor-based CCN utilizes electronic chime request messages received from other modules in the vehicle over the Controller Area Network (CAN) data bus along with hard-wired inputs to monitor many sensors and switches throughout the vehicle. In response to those inputs, the circuitry and programming of the CCN allow it to control the audible outputs that are produced through its on-board transducer and relay.

The CCN is capable of producing the following audible outputs:

- Slow Rate Repetitive Click - Repeated click tones that are issued at a slow rate of about 90 clicks per minute.
- Fast Rate Repetitive Click - Repeated click tones that are issued at a fast rate of more than about 180 clicks per minute.
- Single Chime Tone - A single chime tone.
- Continuous Repetitive Chime Tone - Repeated chime tones that are issued continuously.

Hard-wired circuitry connects the CCN and the various chime warning system switch and sensor inputs to their modules and to each other through the electrical system of the vehicle. These hard-wired circuits are integral to several wire harnesses that are routed throughout the vehicle and they are retained by many different methods. These circuits may be connected to each other, to the vehicle electrical system, and to the CCN through a combination of soldered splices, splice block connectors, and many different types of wire harness terminal connectors and insulators. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, procedures for proper wire and connector repair, further details on wire harness routing and retention, and pin-out and location views for the various wire harness connectors, splices, and grounds.

The chime warning system circuits and components cannot be adjusted or repaired. If the CCN circuitry, the on-board transducer, or the relay is damaged or ineffective, the instrument cluster assembly must be replaced.