PARKSENSE SYSTEM – ULTRASONIC PROXIMITY ASSISTANCE
System Overview
The ParkSense system in the 2011 Grand Cherokee Overland Summit utilizes an array of ultrasonic sensors embedded in the front and rear bumpers to detect proximity to objects at low speeds. When reverse gear is engaged, or when the system is manually activated at low speed, the sensors emit inaudible sound waves and interpret their return echoes to calculate object distance.
- Sensor Type: Ultrasonic piezoelectric emitters, painted match with bumper
- Zones Covered: Front (4-sensor array), Rear (4-sensor array)
- Activation Threshold: Under 10 mph (reverse gear or manual toggle)
- Interface: Audible chimes and EVIC (Electronic Vehicle Information Center) proximity bar
System Operation
When active, ParkSense monitors for solid objects within range and issues graduated warnings via audible beeps, increasing in frequency as the vehicle nears the obstruction. The system dynamically adjusts sensitivity based on approach speed. The EVIC simultaneously displays a bar-style proximity meter with zone-specific indicators. Chimes can be muted temporarily via the infotainment settings menu.
- Warning Distance: Approximately 6 ft to 6 in detection range
- Final Alert: Continuous tone issued when within 10–12 in of obstacle
- Rear Activation: Auto-on when reverse gear selected
- Front Activation: Manual button or auto-enable if reverse is preceded by drive
Sensor Integration & Wiring
Each sensor is wired individually to the ParkSense control module, typically mounted in the rear quarter panel. The module connects to the CAN bus to relay object distance data to the EVIC and head unit. The front bumper harness includes a deactivation switch to prevent false positives in traffic or off-road situations. Sensor signal integrity depends on proper alignment and clean surface geometry.
- Control Module: Located in driver-side rear fender cavity
- Sensor Mounting: Press-fit into pre-formed bumper recesses
- CAN Integration: Reports real-time proximity data to BCM
- Self-Test: Startup tone sequence if all sensors report present and functioning
Common Faults & Limitations
Fault conditions include sensor misalignment, water intrusion, snow or mud coverage, and electrical shorts in the harness or connector. The system may disable itself after consecutive failed pings or if any sensor becomes non-responsive. The EVIC will display a warning if ParkSense is disabled or faulted.
- False Positive: Surface contamination or angled reflections
- Constant Tone: Shorted sensor line or moisture intrusion
- EVIC Message: “Park Assist Unavailable – Service Required” for fault state
- Limited Operation: May be temporarily disabled by ESC or ABS interventions
Service, Replacement & Disable
Individual sensors can be replaced after bumper removal and connector release. A scan tool can identify which sensor is failed or shorted. For off-road or modified bumper configurations, ParkSense can be disabled via the vehicle’s settings menu or by removing the fuse to prevent warnings. Reprogramming via scan tool may be required when installing a new control module.
- Replacement Part: Sensor body with color-matched paint code (OEM or aftermarket)
- Scan Tool Access: Under Body > Park Assist menu (read DTC and sensor status)
- Disable Option: Settings > Safety Features > Park Assist Off
- Calibration: Not required – system is self-learning after sensor install