Chime & Buzzer: Overview Dodge Caravan IV

DESCRIPTION

The chime/buzzer system provides the driver with warning chimes for

1. Seat Belt
2. Exterior Lamps ON
3. Key-In Ignition
4. Engine Temperature Critical
5. Turn Signals ON
6. Dome Lamp ON
7. Low Oil Pressure
8. High Speed Warning
9. Warning Lamp Announcement
10. Key-In Accessory
11. Low/High Tire Pressure
12. Service Tire Pressure Monitor (TPM)

OPERATION

Refer to BODY DIAGNOSTIC PROCEDURES for complete chime/buzzer operation and conditions for operation.

When the ignition is put in the RUN position, all the Light Emitting Diodes (LED's) will illuminate for approximately one second. This will be interrupted if the system senses an obstacle.

The ready status will be sensed by the outermost two yellow LED's being illuminated at 50% intensity. As the obstacle is sensed, the yellow LED's will start illuminating inward until the object in approximately 40 cm (16 in.) away and then the inner red LED will light.

The display is sensitive to which side of the rear of the vehicle that the object is detected. If on the left rear, the left segments will light and the same for the right side of the vehicle.

CORRELATION OF LED SEGMENTS TO DISTANCE

There will be an audible tone when the object gets within 40 cm (16 in.) from the rear of the vehicle.

To diagnose and test the Park Assist System, use a scan tool and the appropriate diagnostic information.

Scheme 1

1. Open hood.
2. Disconnect and isolate the battery negative cable.
3. Open liftgate.
4. Lower the headliner in the rear of the vehicle in the liftgate opening. Follow the headliner removal procedure for the rear of the headliner «(Refer to BODY/INTERIOR/HEADLINER - REMOVAL)»(ref-248887-S26465990322007022700000).
5. Bend the retaining tabs upwards to allow the park assist display to drop out of the headliner opening. (Scheme 1) 1 - PARK ASSIST DISPLAY 2 - DISPLAY RETAINING TABS 3 - HEADLINER 4 - DISPLAY ELECTRICAL CONNECTOR
6. Disconnect the display electrical connector and remove from vehicle. (Scheme 1)

The module has a number of functions

1. Supply voltage to the sensors and display.
2. Disconnection of the display with bus idle and over voltage Vmax.
3. Triggering the sensors.
4. Analyze echo delay times and calculate obstacle distances.
5. Bi-directional data communication to the display for diagnosis.
6. System diagnostics - diagnosis and error handling (sensors, display, module).
7. Data exchange over the Programmable Communication Interface (PCI) data bus.

The system detection length from the rear of the vehicle is 0.3 meters to 1.5 meters. This area extends around the rear side of the vehicle. The system detection height from the ground is 0.2 meters to about 1.5 meters. The radio mutes when the system activates its audible tone.

When the driver selects Reverse, the system scans for objects behind the vehicle using four sensors located in the rear bumper. Objects can be detected from up to 1.5 meters. A warning display above the rear window provides both visible and audible warnings indicating the range of the object.

The system is active only when the vehicle is in reverse for vehicle speeds less than 16 Km/h (10 mph). If the vehicles Parking/Emergency Brake is applied, the system is deactivated.

The display contains two sets of yellow and red Light Emitting Diode's (LED's) that the driver can see as they look over their shoulder while backing up. Each side of the vehicle has its own warning LED's. The system provides a visual warning by illuminating one or more yellow LED's as the vehicle gets closer to the object. As the vehicle continues to approaches the object, one red LED is illuminated and the system emits a series of short beeps. The tone will remain constant and both red LED's are illuminated once the vehicle is within 12 inches (30.5 cm) of the object.

The system can be turned ON or OFF through the Electronic Vehicle Information Center (EVIC) when the vehicle is in PARK. If the park assist system is turned OFF, a single chime will sound and the EVIC will display the following message "REAR PARK ASSIST OFF", when the vehicle is in reverse.

1. Ensure that the rear bumper is free of dirt and debris to keep the system operating properly.
2. Jackhammers, large trucks, and other vibrations could affect the performance of the system.
3. Ensure that the parking brake is not applied.

If "Service Park Assist System" appears in the EVIC after making sure the rear bumper is clean, proceed to diagnose the system using a scan tool and the appropriate diagnostic information.

To diagnose the Park Assist Module, use a scan tool and the appropriate body diagnostic information.

Scheme 2

1. Open hood.
2. Disconnect and isolate the battery negative cable.
3. Remove the left quarter trim panel «(Refer to BODY/INTERIOR/QUARTER TRIM PANEL - REMOVAL)»(ref-248887-S07029878172007022700000).
4. Disconnect the Park Assist Module electrical connector. (Scheme 2) 1 - MODULE ELECTRICAL CONNECTOR 2 - PARK ASSIST MODULE
5. Remove the two attaching screws and separate the module from vehicle. see scheme 7

The Park Assist Sensors

1. Generate ultrasonic pulses when triggered by the Park Assist Module.
2. Reception/filtering of ultrasonic energy received.
3. Signalling the module of received ultrasonic pulses that meet threshold criteria.

The sensors are supplied power by the module. The sensor supply is enabled when the sensor function is necessary.

The sensors detection length from the rear of the vehicle is 0.3 meters to 1.5 meters. This area extends around the rear side of the vehicle. The sensor detection height from the ground is 0.2 meters to about 1.5 meters.

1. Ensure that the rear bumper (sensors) is free of dirt and debris to keep the system operating properly.
2. Jackhammers, large trucks, and other vibrations could affect the performance of the system.
3. Ensure that the parking brake is not applied.

If "Service Park Assist System" appears in the EVIC after making sure the rear bumper is clean, proceed to diagnose the system using a scan tool and the appropriate diagnostic information.

Scheme 3

Scheme 4

1. Open hood.
2. Disconnect and isolate the battery negative cable.
3. Remove rear fascia «(Refer to FRAME & BUMPERS/BUMPERS/REAR FASCIA - REMOVAL)»(ref-248897-S21656916742007022700000).
4. Remove the sensor retaining clip from the back side of the fascia. (Scheme 3) 1 - REAR FASCIA 2 - PARK ASSIST SENSOR
5. Push the Park Assist Sensor out ot the fascia. (Scheme 4)

See also:
• BODY DIAGNOSTIC PROCEDURES