Jeep Grand Cherokee WK. Manual - part 286

The Park Assist Display (4) is located in the rear of vehicle, over the rear window in the headliner. Located in the
rear of the vehicle for easy visual reference when the driver is backing up.

The display is used to alert the driver of any obstacles detected in the rear of the vehicle. The chime or audible
signal also comes from the display unit.

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 (1) being illuminated. As the obstacle is
sensed, the yellow LED’s will start illuminating inward
(6) until the object in approximately 40 cm (16 in.)
away and then the inner red LED will light (3).

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.

8B - 70

CHIME/BUZZER - SERVICE INFORMATION

CORRELATION OF LED SEGMENTS TO DISTANCE

DISPLAY LED

DISTANCE

LED COLOR

AUDIBLE SIGNAL

REAR CORNERS

REAR CENTER

1st LED

150 cm (59 in.)

Yellow

None

2nd LED

120 cm (47 in.)

Yellow

None

3rd LED

100 cm (39 in.)

Yellow

None

4th LED

80 cm (31.5 in.)

Yellow

None

5th LED

65 cm (25.5 in.)

Yellow

None

6th LED

50 cm (20 in.)

Yellow

None

7th LED

40 cm (16 in.)

Red

30 cm (12 in.)
Intermittant

8th LED

15 cm (6 in.)

30 cm (12 in.)

Red

20 cm (8 in.)
Continuous

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.

REMOVAL

1. Disconnect and isolate the battery negative cable.

2. Lower the headliner (3) in the rear of the vehicle in

the liftgate opening. Follow the headliner removal
procedure for the rear of the headliner (Refer to 23
- BODY/INTERIOR/HEADLINER - REMOVAL).

3. Bend the retaining tabs (2) upwards to allow the

park assist display (1) to drop out of the headliner
(3) opening.

4. Disconnect the display electrical connector (4) and

remove display (1) from vehicle.

INSTALLATION

1. Position the Park Assist Display (1) in headliner (3)

opening and connect the display electrical connec-
tor (4).

2. Bend the retaining tabs (2) down behind the head-

liner (3).

3. Raise the headliner in the rear of the vehicle in the

liftgate opening (Refer to 23 - BODY/INTERIOR/
HEADLINER - INSTALLATION).

4. Connect the battery negative cable.

CHIME/BUZZER - SERVICE INFORMATION

8B - 71

PARK ASSIST MODULE

DESCRIPTION

The Park Assist Module has a molded plastic housing
which housing internal circuitry and two electrical con-
nectors. There are four mounting tabs that affix the
module to the mounting bracket with four clips.

The Park Assist Module (1) is located on the left side
of the vehicle, under the rear seat cushion, next to the
final drive control module.

The park assist module (1) has a number of functions:

•

Supply voltage to the sensors and display.

•

Disconnection of the display with bus idle and
over voltage Vmax.

•

Triggering the sensors.

•

Analyze echo delay times and calculate obstacle
distances.

•

Bi-directional data communication to the display
for diagnosis.

•

System diagnostics - diagnosis and error han-
dling (sensors, display, module).

•

Data exchange over the Controller Area Network
(CAN) data bus.

8B - 72

CHIME/BUZZER - SERVICE INFORMATION

OPERATION

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 (5) located in
the rear bumper. Objects can be detected from up to 1.5 meters. A warning display (4) above the rear window
provides both visible and audible warnings indicating the range of the object.

The system in 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 park assist system has a disable switch (2) located on the instrument panel center stack within the upper instru-
ment panel switch pod. The default for the system is ON, but it may be turned OFF by a press of the switch. This
is a momentary switch and the system will stay OFF until pressed again or the ignition key is cycled. If the park
assist system is turned OFF, a single chime will sound and the EVIC will display the following message “PARK
ASSIST DISABLED”, when the vehicle is in reverse.

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.

•

Ensure that the rear bumper is free of dirt and debris to keep the system operating properly.

•

Jackhammers, large trucks, and other vibrations could affect the performance of the system.

CHIME/BUZZER - SERVICE INFORMATION

8B - 73

Content .. 284 285 286 287 ..