Audible Warning Device: Description and Operation
Chime/Buzzer - Description
Chime Warning System
CHIME WARNING SYSTEM
A chime warning system is standard factory-installed equipment. The chime warning system uses an electromechanical transducer, an electromechanical
relay and an electromechanical buzzer that are soldered onto the electronic circuit board within the ElectroMechanical Instrument Cluster (EMIC) (also
known as the Cab Compartment Node/CCN or KOMBI) to provide audible indications of various vehicle conditions that may require the attention of the
vehicle operator or occupants.
The electromechanical transducer, relay and buzzer generate gong tones, click tones and buzzer tones that emulate the sounds associated with
conventional announcement chimes, turn signal and hazard warning flasher clicking or warning buzzer operation. The microprocessor-based EMIC
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 EMIC
allow it to control the audible outputs that are produced through its on-board transducer, relay and buzzer.
The EMIC is capable of producing the following audible outputs:
Fast Rate Repetitive Click - Repeated click tones that are issued at a fast rate of more than about 100 clicks per minute.
Slow Rate Repetitive Click - Repeated click tones that are issued at a slow rate of about 50 clicks per minute.
Repetitive Gong - Repeated gong tones.
Single Gong - A single gong tone.
Warning Buzzer - An extended buzzer tone.
Hard wired circuitry connects the EMIC 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, 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 EMIC 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 EMIC chime warning system circuits and components cannot be adjusted or repaired. If the EMIC circuitry or the on-board transducer, relay or
buzzer are damaged or ineffective, the EMIC unit must be replaced.
Park Assist System
PARK ASSIST SYSTEM
A park assist system (also known as the ParkTronic System/PTS) is an optional factory-installed electronic parking aid. During parking and other similar
vehicle maneuvers this system alerts the vehicle operator to obstacles located in the path immediately in front of or behind the vehicle which, due to the
surrounding vehicle structures, might be otherwise difficult to perceive. When an object is detected, the system uses electromechanical buzzer
transducers and Light Emitting Diode (LED) indicators to provide the vehicle operator with audible and visual indications of the presence and proximity
of such objects.
The park assist system includes the following major components, which are described in further detail elsewhere in this service information:
Front Park Assist Display - Vehicles equipped with the park assist system have a front park assist display unit (also known as the front
ParkTronic System/PTS warning element) mounted in the center of the instrument panel top cover near the windshield. The front display includes
an integral electromechanical buzzer transducer. Only the narrow, oval-shaped smoked clear lens of the front display is visible on the outer surface
of the instrument panel.
Park Assist Module - Vehicles equipped with the park assist system include a park assist module (also known as the ParkTronic System/PTS
module) which is secured within the driver side seat riser. It is concealed beneath the driver side front seat cushion on vehicles that are so
Park Assist Sensors - Vehicles equipped with the park assist system have four ultrasonic park assist sensors (also known as ParkTronic
System/PTS sensors) that are concealed behind the rear bumper and six ultrasonic park assist sensors that are concealed behind the front bumper.
Each sensor is snapped into an individual molded plastic mounting bracket located at horizontal intervals along the back side of the front and rear
Park Assist Switch - The optional park assist system can be manually disabled or enabled using a park assist OFF switch (also known as the PTS
OFF switch) that is integral to the instrument panel switch pod (also known as the Switch Bank Module/SBM or upper control panel/center
console switch module/OBF control unit) in the instrument panel center stack below the heater and air conditioner controls and above the gearshift
lever. The switch includes a Light Emitting Diode (LED) that illuminates to indicate when the park assist system is inactive.