Chime Warning System

CHIME WARNING SYSTEM





A chime warning system is standard factory-installed equipment. The chime warning system uses an electromechanical transducer and an electromechanical relay that are soldered onto the electronic circuit board of the instrument cluster (1). This warning system provides audible indications of various vehicle conditions that may require the attention of the vehicle operator or occupants. The instrument cluster also includes the hardware and software necessary to serve as the electronic body control module and is sometimes referred to as the Cab Compartment Node (CCN).

The electromechanical transducer generates beep tones and 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 uses electronic chime request messages received from other modules in the vehicle over the Controller Area Network (CAN) data bus, along with hardwired 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 generated at a rate of 50 clicks per minute.
- Fast-Rate Repetitive Click - Repeated click tones generated at a rate of 100 clicks per minute.
- Fixed Duration Beep - A short, sharp, single beep tone.
- Single Chime Tone - A single chime tone.
- Slow-Rate Repetitive Chime - Repeated chime tones generated at a rate of 50 chimes per minute.
- Fast-Rate Repetitive Chime - Repeated chime tones generated at a rate of 180 chimes per minute.

Hardwired 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 hardwired circuits are integral to several wire harnesses, which are routed throughout the vehicle and retained by many different methods. These circuits may be connected to each other, to the vehicle electrical system and to the CCN through the use of 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, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.

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