Chime/buzzer - Service Information: Other Dodge Nitro I

CHIME WARNING SYSTEM

The chime warning system operates on battery voltage received through a fuse in the Totally Integrated Power Module (TIPM) on a non-switched fused B(+) circuit so that the system may operate regardless of the ignition switch position. The chime warning system also monitors the ignition switch position so that some chime features are functional only with the ignition switch in the ON position, while others are functional regardless of the ignition switch position.

The chime warning system provides an audible indication to the vehicle operator or occupants under the following conditions

1. Airbag Indicator Warning - The ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN) transducer will generate one short chime when the ignition switch is in the ON position, and the airbag indicator is illuminated. This warning indicates that a failure condition has been monitored affecting the operation of the Supplemental Restraint System (SRS) related components or circuits. This warning will only occur following completion of the airbag indicator bulb test, and will only occur once during any ignition cycle.
2. Door Ajar Warning - The EMIC/CCN will generate one short chime when the ignition switch is in the ON position, when the door ajar indicator is illuminated, or when a DOOR(S) OPEN textual message is displayed in the odometer Vacuum Fluorescent Display (VFD) unit of the instrument cluster. This warning indicates that a door is, or multiple doors are not closed or completely latched while the vehicle is moving.
3. Fasten Seat Belt Indicator Warning - The EMIC/CCN transducer will generate repetitive chimes at a slow rate to announce that the seat belt switches and the ignition switch indicate that a front seat belt is not fastened with the ignition switch in the ON position. Vehicles with the optional Occupant Classification System (OCS) monitor both outboard front seat belts, while vehicles without OCS monitor only the driver side front seat belt. The chime warning system also supports the enhanced seat belt reminder (beltminder) when this feature is enabled. Refer to «OPERATION»(ref-306158-S31222194742008120900000) .
4. Gate Ajar Indicator Warning - The EMIC/CCN transducer will generate one short chime when the liftgate ajar indicator is illuminated, or when a LIFTGATE OPEN textual message is displayed in the odometer VFD unit of the instrument cluster. This warning indicates that the liftgate is not closed or completely latched while the vehicle is moving.
5. Head/Park Lamps-On Warning - The EMIC/CCN transducer will generate repetitive chimes at a fast rate to indicate that inputs from the headlamp switch and the ignition switch indicate that the exterior lamps are turned ON with the ignition switch in the OFF position, and a hard wired input is received indicating that the driver side front door is open. The chimes will continue to sound until the exterior lamps are turned OFF, the driver side front door is closed, or the ignition switch is turned to the ON position, whichever occurs first.
6. Key-In-Ignition Warning - The EMIC/CCN transducer will generate repetitive chimes at a fast rate to indicate that inputs from the key-in ignition switch, the ignition switch, and the driver side front door ajar switch indicate that the key is in the ignition lock cylinder with the ignition switch in the OFF position with the driver side front door open. The chimes will continue to sound until the key is removed from the ignition lock cylinder, the driver side front door is closed, or the ignition switch is turned to the ON position, whichever occurs first.
7. Low Fuel Indicator Warning - The EMIC/CCN transducer will generate one short chime when the low fuel indicator is illuminated in the instrument cluster. This warning indicates that the monitored fuel level in the fuel tank is low. This chime will only occur once during any ignition cycle.
8. Park Brake Reminder - The EMIC/CCN transducer will generate one short chime when the brake/park brake indicator is illuminated to announce that the park brake is applied or not fully released and the vehicle is moving. This chime will repeat each time the input conditions are met.
9. Overspeed Warning - The EMIC transducer will generate one short chime when the vehicle speed is over a pre-programmed speed value. This feature is only enabled on vehicles that have been configured for sale in a Middle East Gulf Coast Country (GCC).
10. Park Brake Reminder - The instrument cluster chime tone generator will generate ten repetitive chimes at a slow rate to announce that the hard wired input from the park brake switch and an electronic vehicle speed message input received from the PCM over the CAN data bus indicates that the park brake is applied and the vehicle is moving. This chime feature will repeat each time the input conditions are met.
11. Sentry Key Customer Learn Mode Announcement - The EMIC/CCN transducer will generate one short chime to confirm that the Sentry Key electronic Customer Learn mode is active, which indicates that the Sentry Key Remote Entry Module/Wireless Control Module (SKREEM/WCM) is prepared for programming additional Sentry Key transponders. This chime feature is only active on vehicles equipped with the optional Sentry Key system, and sold in a market where Customer Learn programming is an allowed feature.
12. Turn Signal On Warning - The EMIC/CCN transducer will generate repetitive chimes at a slow rate to indicate that a turn signal has been active continuously for 1.6 kilometers (1 mile) with the vehicle speed greater than 22 kilometers-per-hour (15 miles-per hour). Vehicles built for markets other than the United States and Canada have a revised distance threshold of 4 kilometers (2.49 miles) for this feature. The chime will continue until the turn signal input becomes inactive or until the electronic vehicle speed message indicates that the speed is less than 22 kilometers-per-hour (15 miles-per-hour), whichever occurs first. The hazard warning flashers will not activate this chime feature.
13. Warning Indicator Announcement - The EMIC/CCN transducer will generate one short chime each time the Malfunction Indicator Lamp (MIL) lamp or certain other indicators are illuminated by the instrument cluster circuitry. The MIL and certain other indicators may be illuminated when any critical engine or transmission systems are operating outside of their normal parameters. The instrument cluster monitors electronic messages received over the CAN data bus to determine when to illuminate these indicators.

The EMIC/CCN provides chime service for all available features in the chime warning system, except for the audible warning function provided by each of the optional park assist system display modules. The EMIC/CCN relies upon its internal programming, numerous hard wired inputs, and electronic message inputs received from other modules over the Controller Area Network (CAN) and the Local Interface Network (LIN) data buses to provide the chime warning system features. The internal programming of the EMIC/CCN determines the priority of each chime request input that is received, as well as the rate and duration of each chime that is to be generated.

The hard wired circuits between components related to the chime warning system may be diagnosed using conventional diagnostic tools and procedures. Refer to SYSTEM WIRING DIAGRAMS . The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the chime warning system or the electronic controls or communication between modules and other devices that provide some features of the chime warning system. The most reliable, efficient, and accurate means to diagnose the chime warning system or the electronic controls and communication related to chime warning system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

PARK ASSIST SYSTEM

The park assist system is active only when the ignition switch is in the ON or START positions, the parking brake is released, the transmission gear selector lever is in the REVERSE position and the vehicle speed is less than 16 kilometers-per-hour (10 miles-per-hour). In vehicles equipped with this option, the system is enabled from the factory as a default. The system can be manually disabled and enabled by the vehicle operator using either the park assist switch integral to the instrument panel switch pod, or by using the settings menu of the Electronic Vehicle Information Center (EVIC) of vehicles not equipped with a park assist switch in the instrument panel switch pod. If the vehicle operator does not want the system active, momentarily depressing the park assist switch OFF button, or selecting the park assist disable setting of the EVIC will disable the system until the switch button is depressed again or the EVIC park assist setting is changed to enabled.

Reasons for disabling the system include trailer towing and off road use. With a trailer attached to the vehicle the audible and visible park assist alerts would be incessant whenever the gear selector lever was in the REVERSE position due to the proximity of the trailer to the rear of the vehicle. Similarly, operating the vehicle off road may cause the park assist alerts to become distracting due to the proximity of large trees or boulders and the extreme rear approach angles that may be encountered while maneuvering on off road trails or terrain. When the system is disabled, a PARK ASSIST OFF icon and textual message will appear in the EVIC display of the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN) whenever the gear selector lever is in the REVERSE position.

The microprocessor based park assist module is the central component of the park assist system. It supplies voltage to the park assist sensors and the park assist display, receives and analyzes data from the sensors, calculates and communicates the proper display information to the park assist display, performs system diagnostics, and communicates with other electronic modules in the vehicle or with a diagnostic scan tool over the Controller Area Network (CAN) data bus. The module operates on battery voltage received through a fuse in the Totally Integrated Power Module (TIPM), and is grounded through a take out of the body wire harness.

Four ultrasonic park assist sensors in the rear bumper fascia allow the park assist system to locate and identify the proximity of nearby obstacles. These sensors each generate ultrasonic sound pulses when triggered by the park assist module, then signal the module when an echo of the reflected sound pulses is received. The detection distance range from the rear of the vehicle is about 0.3 meters (11.8 inches) to about 2 meters (80 inches), and the detection height range from the ground is about 0.2 meters (7.8 inches) to about 0.8 meters (31 inches). The detection area extends somewhat around both rear sides (corners) of the vehicle.

The park assist display unit provides the vehicle operator with both visible and audible warnings indicating the relative range of a detected object. The display is visible to the vehicle operator over an inboard shoulder when looking rearward while backing the vehicle up, but is not visible in a properly adjusted inside rear view mirror when looking forward. The display contains two sets of eight Light Emitting Diode (LED) indicator units, one set dedicated to each side of the vehicle, and an audible chime tone transducer. The LED units are concealed beneath a smoked oval lens and are not clearly visible when they are not illuminated. When the park assist system is active and no obstacles are detected, the two outermost, amber LED units in the display are illuminated at a reduced intensity to provide visual confirmation that the system is operating.

The display provides a visual indication of a detected object by illuminating one or more LED indicators, amber first followed by red, moving toward the center of the display as the vehicle gets closer to the object. As the vehicle comes to within about 40 centimeters (31 inches) of the object, 1 red LED is illuminated and the display emits a series of short, intermittent, audible beeps. If the audio system is turned ON, the audio output will be muted automatically while the park assist audible warning is being generated. The audible warning changes from intermittent beeps to a continuous tone as the final red indicators are illuminated on 1 or both sides of the display and the vehicle comes to within 30.5 centimeters (12 inches) of a detected object.

When the park assist module monitors a problem in any of the park assist system circuits or components, it stores a fault code or Diagnostic Trouble Code (DTC) in its memory circuit, illuminates all four red LED units in the park assist display, sends an electronic message to the EVIC, and a SERVICE PARK ASSIST SYSTEM textual message is displayed in the EVIC display.

The hard wired circuits between components related to the park assist system may be diagnosed using conventional diagnostic tools and procedures. Refer to SYSTEM WIRING DIAGRAMS . The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the park assist system or the electronic controls or communication between modules and other devices that provide some features of the park assist system. The most reliable, efficient, and accurate means to diagnose the park assist system or the electronic controls and communication related to park assist system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

The hard wired circuits between components related to the chime warning system may be diagnosed using conventional diagnostic tools and procedures. Refer to SYSTEM WIRING DIAGRAMS . The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the chime warning system or the electronic controls or communication between modules and other devices that provide some features of the chime warning system. The most reliable, efficient, and accurate means to diagnose the chime warning system or the electronic controls and communication related to chime warning system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

If a SERVICE PARK ASSIST SYSTEM textual message appears in the Electronic Vehicle Information Center (EVIC) display, be certain to confirm the following

1. Be certain that the rear bumper is free of dirt and debris to keep the system operating properly.
2. Be certain that the parking brake is not applied.
3. The presence of jackhammers, large trucks, and other vibrations in the vicinity of the vehicle could impact the performance of the system.

The hard wired circuits between components related to the park assist system may be diagnosed using conventional diagnostic tools and procedures. Refer to SYSTEM WIRING DIAGRAMS . The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the park assist system or the electronic controls or communication between modules and other devices that provide some features of the park assist system. The most reliable, efficient, and accurate means to diagnose the park assist system or the electronic controls and communication related to park assist system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

Scheme 57

The park assist display (1) is located in the headliner at the rear of the vehicle, just forward of the upper liftgate opening header. Only the smoked clear plastic display lens (3) is visible on the headliner. The lens prevents the 4 red Light Emitting Diode (LED) units and 12 amber LED units from being clearly visible unless they are illuminated by the electronic circuitry of the display.

The remainder of the display including the mounting provisions and the electrical connection are concealed above the headliner. A molded plastic housing with an integral connector receptacle (2) at one end contains and protects the electronic circuitry of the display, including an audible tone transducer and an electronic communication chip.

Scheme 58

A molded plastic retainer (1) with three integral tabs (2) engages three slots integral to the display housing above the lens. The retainer is installed over the display housing above the headliner substrate to engage and securely lock the display into the opening in the headliner. An arrow and the text REAR are molded into an integral installation tab (3) to ensure correct retainer orientation.

The park assist display is serviced only as a complete unit. It cannot be adjusted or repaired. If ineffective or damaged, the entire display unit must be replaced.

Scheme 59

The park assist display provides the vehicle operator with visual feedback by illuminating amber or red Light Emitting Diode (LED) units individually or in unison, and audible feedback by energizing an audible tone transducer on the display electronic circuit board to emit either an intermittent or a continuous tone. While the park assist system is active, the number, position and color of the illuminated LED units as well as the audible signal frequency indicate the relative position and distance of obstacles detected at the rear of the vehicle.

The park assist display receives battery current and ground from and is completely controlled by the park assist module. The display also contains an electronic communication chip that allows bi-directional communication to occur with the park assist module over a dedicated serial bus line. The microprocessor in the park assist module completely controls the display outputs, continually monitors the display status, and will store a Diagnostic Trouble Code (DTC) in memory for any monitored fault it detects in the park assist display. The illumination intensity of the LED units is also controlled by the park assist module based upon internal programming and electronic panel lamps dimming messages received over the Controller Area Network (CAN) data bus.

When the ignition switch is turned to the ON position, all 16 of the LED units in the display will illuminate in unison for approximately 1 second as a bulb test. This output will be interrupted if the system is active and senses an obstacle. Following the conclusion of the bulb test, when the system is active but no obstacle is detected, the display will indicate system readiness by illuminating the two outermost amber LED units (1) at a reduced intensity. As an obstacle is detected, the outermost amber LED unit (5) on the side of the vehicle where the obstacle was detected will be illuminated at normal intensity and a single short audible tone (one-half second duration) is sounded. Then additional amber LED units (6) will begin illuminating inward (2 or 4) as the obstacle gets closer until, finally, the two red LED units (7) are illuminated.

When the final red LED unit (3) is illuminated, the obstacle is approximately 40 centimeters (16 inches) from the rear corner of the vehicle or approximately 50 centimeters (19.7 inches) from the rear bumper face and an intermittent audible tone will be generated. The frequency of the audible tone will increase as the obstacle continues to become closer until the tone is continuous when the obstacle is about 15 centimeters (6 inches) from the rear corner of the vehicle or about 30 centimeters (11.8 inches) from the rear bumper face. Whenever a park assist audible tone is being generated, the park assist module sends electronic messages to the radio over the CAN data bus to mute the audio system. The audible tone will be cancelled after about two seconds if the detected distance to the obstacle remains constant. See the Park Assist Display Outputs table for additional details.

The hard wired circuits between components related to the park assist display may be diagnosed using conventional diagnostic tools and procedures. Refer to SYSTEM WIRING DIAGRAMS . The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the park assist display or the electronic controls or communication between modules and other devices that provide some features of the park assist system. The most reliable, efficient, and accurate means to diagnose the park assist display or the electronic controls and communication related to park assist display operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

Scheme 60

1. Disconnect and isolate the battery negative cable.
2. Remove the trim from the upper liftgate opening. Refer to «REMOVAL»(ref-306147-S06568495072008120900000) .
3. Partially remove the quarter trim panel from both upper D-pillars. Refer to «REMOVAL»(ref-306147-S42114936982008120900000) .
4. Carefully pull down the rear edge of the headliner (5) from the upper liftgate opening header (2) far enough to access the rear park assist display housing (3) and the display retainer (4).
5. Disconnect the wire harness connector (1) from the connector receptacle on the left end of the display housing.
6. Carefully spread the front and rear edges of the molded plastic retainer far enough to disengage the three retainer tabs from the slots in the display housing, then lift the retainer off of the display housing.
7. Push the right end of the display out through the lower surface of the headliner, then slide the display toward the right side of the vehicle far enough to disengage the connector receptacle from the headliner opening.