PARK ASSIST SYSTEM
The Park Assist System is an electronic parking aid that alerts the driver to obstacles which are located immediately behind the vehicle. Objects are sensed using ultrasonic sound waves. When an object is detected, the system will give the driver visual and audible warnings. The system is customer programmable through the Electronic Vehicle Information Center (EVIC) but will be enabled from the factory as a default.
The major components of the park assist system are
- Park Assist Module - supplies voltage to the object detection sensors and park assist display. It triggers the sensors, analyzes the echo delay times and calculates obstacle distances. It sends display information to the park assist display, performs system diagnostics, and communicates via the Programmable Communication Interface (PCI) date bus network.
- Park Assist Sensors - there are four sensors located in the rear bumper that generate ultrasonic pulses when triggered by the park assist module. The sensors signal the park assist module when reflected ultrasonic pulses are received.
- Park Assist Display - there are sixteen Light Emitting Diode (LED) indicators which provide indication of relative distance to obstacles. When the system is engaged and no obstacles are detected, the two outermost yellow LED's are lit at reduced brightness to show the system is working. As the distance to a detected obstacle decreases, more yellow LED's towards the center of the display illuminate.
For diagnosis and testing of the park assist system, use a scan tool and the appropriate body diagnostic information.
CHIME PRIORITY
The following list indicates the priority of the chime when more than one chime is active at the same time
- Seat Belt Warning
- Door Ajar
- Turn Signal On
- Chime Request
- Power Liftgate
The cluster is responsible to set priority on all warning lamp announcement chimes.
DRIVER'S SEAT BELT UNBUCKLED
There are two different Fasten Seat Belt Reminder announcements incorporated into the cluster's logic, a Non-enhanced announcement and an Enhanced announcement.
When the Enhanced announcement is DISABLED
- The cluster will chime five times (not greater than six seconds) and illuminate the Seat Belt Lamp after turning the ignition to the run/start position if the driver seat belt is unbuckled.
When the Enhanced announcement is ENABLED
- The cluster will chime continuously at a slow rate for a period of 6 seconds and illuminate the Seat Belt Lamp after turning the ignition to the run/start position if the driver seat belt is unbuckled. After 6 seconds the chime will stop, but the Seat Belt Lamp will stay illuminated. If the ignition is in the run position for a period greater than 60 seconds, and the driver seat belt is unbuckled, and the vehicle's speed is greater than 5 mph (8 km/h) in a forward gear, the Enhanced Fasten Seat Belt Reminder will activate. This will cause the Seat Belt Lamp to blink and a slow continuous chime to sound for 5 seconds. After 5 seconds, the chime will stop, but the lamp will remain illuminated for an additional 3 seconds. The Enhanced Seat Belt Reminder cycles for a total of 12 times (96 seconds). After the 12th time, the Seat Belt Lamp will remain on without any chime. Buckling the driver seat belt at anytime will cancel the Fasten Seat Belt Reminder announcement.
EXTERIOR LIGHTS ON
Chime sounds if the ignition is in the lock position, the drivers door is ajar, and the headlight switch is in any position other than auto or off. The chime will continue to sound until anyone of the above conditions change or the battery protection time of 3 minutes expires.
KEY-IN IGNITION
Chime sounds if the key is in the ignition, the ignition is in the lock position, and the drivers door is ajar. The chime will continue to sound until anyone of the above conditions change or the battery protection time of 15 minutes expires.
TURN SIGNAL ON
If the BCM detects a turn signal input continuously for 1.0 mile (0.6 km) and the vehicle speed is greater than 15 mph (24 km/h), the cluster will chime continuously and display an EVIC warning message, until the turn signal is cancelled.
LOW OIL PRESSURE
Chime sounds when the engine is operating and the oil pressure drops below 4 psi (27.5 kPa).
ENGINE TEMPERATURE CRITICAL
Chime sounds when the engine is operating and the coolant temperature exceeds 252°F (122°C). The chime is continuous at 257°F (125°C) and will chime for 4 minutes and stop if the temperature drops below 243°F (117°C).
WARNING LAMP ANNOUNCEMENT
Chime sounds to alert the driver to scan the EVIC (in the cluster) to see which EVIC warning message displayed. The door/liftgate ajar warning message will display (without a chime) if the vehicle is running and a door or the liftgate is open. A chime will sound if the door or liftgate is still open when vehicle speed is greater than 1 mph (1.6 km/h).
LOW FUEL LAMP
The cluster will sound a single chime, illuminate an amber lamp, and display an EVIC warning message after illuminating the indicator.
VOLT LAMP
The cluster will sound a single chime after illuminating the indicator.
OIL PRESSURE LAMP
The cluster will sound a single chime after illuminating the indicator above 450 RPM vehicle operation.
FASTEN SEAT BELT LAMP
There are two different Fasten Seat Belt Reminder announcements incorporated into the cluster's logic, a Non-enhanced announcement and an Enhanced announcement.
When the Enhanced announcement is DISABLED
- The cluster will chime five times (not greater than six seconds) and illuminate the Seat Belt Lamp after turning the ignition to the run/start position if the driver seat belt is unbuckled.
When the Enhanced announcement is ENABLED
- The cluster will chime continuously at a slow rate for a period of 6 seconds and illuminate the Seat Belt Lamp after turning the ignition to the run/start position if the driver seat belt is unbuckled. After 6 seconds the chime will stop, but the Seat Belt Lamp will stay illuminated. If the ignition is in the run position for a period greater than 60 seconds, and the driver seat belt is unbuckled, and the vehicle's speed is greater than 5 mph (8 km/h) in a forward gear, the Enhanced Fasten Seat Belt Reminder will activate. This will cause the Seat Belt Lamp to blink and a slow continuous chime to sound for 5 seconds. After 5 seconds, the chime will stop, but the lamp will remain illuminated for an additional 3 seconds. The Enhanced Seat Belt Reminder cycles for a total of 12 times (96 seconds). After the 12th time, the Seat Belt Lamp will remain on without any chime. Buckling the driver seat belt at anytime will cancel the Fasten Seat Belt Reminder announcement.
CHECK ENGINE LAMP
The cluster will sound a single chime after illuminating the indicator.
ENGINE TEMPERATURE LAMP
The cluster will sound a single chime when the indicator first illuminates at 252°F (122°C).
TRACTION CONTROL LAMP
The cluster will sound a chime, illuminate a red priority indicator lamp, and display an EVIC warning message after illuminating the indicator if the traction control system
- is active.
- is suspended.
- needs service.
- is disabled by the driver.
If the BCM detects a turn signal input continuously for 1.0 mile (0.6 km) and the vehicle speed is greater than 15 mph (24 km/h), the cluster will chime continuously, illuminate an amber message indicator lamp, and display an EVIC warning message, until the turn signal is cancelled.
BULB CHECK
The chime will sound one time during bulb check.
BRAKE LAMP
The cluster will sound a chime, illuminate a red brake lamp, and display an EVIC warning message if the
- Park brake is engaged and the vehicle speed exceeds 1 mph (1.61 km/h).
- Brake fluid is low.
MEMORY
The cluster will sound a chime and display an EVIC message when
- Memory position #1 is set.
- Memory position #2 is set.
- The vehicle is out of park and a memory recall is selected.
- A memory recall is activated while the seat is in motion during another memory recall.
SERVICE
The cluster will sound a chime, illuminate an amber message indicator lamp, and display an EVIC message when the vehicle reaches the time to perform service.
REMOTE KEYLESS ENTRY
The cluster will sound a chime and display an EVIC message upon activation of
- The key fob with a low battery.
- An invalid key fob and key.
SERVICE IMMOBILIZER
The cluster will sound a chime and display an EVIC message when there is a problem with the SKREEM Module.
POWER LIFTGATE
The cluster will sound a chime and display an EVIC message when there is a power liftgate actuation with the
- Overhead console or RKE and the doors are locked.
- Overhead console and the vehicle is not in park.
- Overhead console or RKE and the temperature is too cold for actuation.
- Overhead console or RKE and the temperature is too hot for actuation.
TIRE PRESSURE MONITOR SYSTEM
The tire pressure monitoring system will request
- A chime, illuminate an amber TPM lamp, and display an EVIC message when the system senses that there is a low tire pressure problem.
- Three fast chimes, illuminate an amber TPM lamp, and display an EVIC message when the system senses that one of the four original tires on the vehicle has been changed.
- A chime, illuminate an amber TPM lamp, and display an EVIC message if the system does not sense any tire pressure.
- A chime, illuminate an amber TPM lamp, and display an EVIC message when the tire system needs service.
The Park Assist System display activates an audible tone that changes from intermittent to continuous as the final two Light Emitting Diodes (LED's) are illuminated on one side or both sides of the display.
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. 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 transmission gear selector is in reverse for vehicle speeds less than 16 Km/h (10 mph). If the vehicle's 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 approach 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.
- 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.
- 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 10
The Park Assist Display. (Scheme 10)is a molded plastic unit housing Light Emitting Diodes (LED's) and a chime module. 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. (Scheme 11) The chime or audible signal also comes from the display unit.
Scheme 11
The Park Assist Display is located in the rear of vehicle, over the rear window in the headliner. (Scheme 11)