Chime & Buzzer - Service Information: Overview Jeep Commander I

Scheme 66

A park assist system is an optional factory-installed electronic parking aid. In some markets only a rear park assist system is offered, while other markets may have both front and rear park assist systems available. 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 an electromechanical transducer and Light Emitting Diode (LED) indicators within the appropriate front or rear park assist display unit to provide the vehicle operator with visual and audible 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

1. Instrument Cluster (2) - In vehicles equipped with the optional park assist system, the reconfigurable dot matrix Organic Light Emitting Diode (OLED) display in the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN) displays textual warnings and error messages and emits audible warnings related to the current operating status of the park assist system.
2. Park Assist Display (4) - Vehicles equipped with the rear park assist system have a park assist display unit mounted in the rear of the headliner above the liftgate opening. Vehicles equipped with the front park assist system have a second park assist display unit mounted in the center of the instrument panel top pad near the windshield. Only the narrow, oval-shaped smoked clear lens of the front or rear display is visible on the outer surface of the instrument panel or the headliner.
3. Park Assist Module (5) - Vehicles equipped with the park assist system include a park assist module which is secured through integral mounting tabs along with the Final Drive Control Module (FDCM) by integral latch features within a cavity in the left end of the intermediate step assembly located on the floor panel beneath the second row seat cushion.
4. Park Assist Sensors (1) - Vehicles equipped with the rear park assist system have four ultrasonic park assist sensors that are concealed behind the rear bumper fascia. In addition to the rear sensors, vehicles equipped with the front park assist system have six ultrasonic park assist sensors that are concealed behind the front bumper fascia. Each sensor is snapped into an individual molded plastic mounting bracket located at horizontal intervals along the back side of the front or rear bumper fascias.
5. Park Assist Switch (3) - The optional park assist system can be manually disabled or enabled using a park assist switch that is integral to the lower switch pod in the instrument panel center stack below the heater and air conditioner controls.

Hard wired circuitry connects the various park assist system components 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 and to the vehicle electrical system 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 park assist system components cannot be adjusted or repaired. If any of the park assist system components are damaged or ineffective, that component must be replaced.

Scheme 67

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 inside of the ElectroMechanical Instrument Cluster (EMIC) (1) to provide audible indications of various vehicle conditions that may require the attention of the vehicle operator or occupants. The EMIC 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 or 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 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 and relay.

The EMIC is capable of producing the following audible outputs

1. Slow Rate Repetitive Click - Repeated click tones that are issued at a slow rate of about 90 clicks per minute.
2. Fast Rate Repetitive Click - Repeated click tones that are issued at a fast rate of more than about 180 clicks per minute.
3. Single Chime Tone - A single chime tone.
4. Slow Rate Repetitive Chime - Repeated chime tones that are issued at a slow rate of about 50 chimes per minute.
5. Fast Rate Repetitive Chime - Repeated chime tones that are issued at a fast rate of about 180 chimes per minute.

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, the on-board transducer or the relay are damaged or ineffective, the EMIC unit must be replaced.