Chime/buzzer - Service Information Jeep Grand Cherokee WK2

Scheme 1

A chime warning system is standard factory-installed equipment. The chime warning system uses an electromechanical transducer and an electromechanical relay that are soldered onto the electronic circuit board inside of the Instrument Cluster (1) to provide audible indications of various vehicle conditions that may require the attention of the vehicle operator or occupants. The instrument cluster includes the hardware and software necessary to serve as the electronic body control module and is also known as the Cab Compartment Node (CCN).

The electromechanical transducer generates beep tones and chime tones, while the electromechanical relay generates click tones to emulate the sounds associated with conventional turn signal and hazard warning flasher operation. The microprocessor-based CCN utilizes electronic chime request messages received from other modules in the vehicle over the Controller Area Network (CAN) data bus and the Local Interface Network (LIN) data bus along with hard-wired inputs to monitor many sensors and switches throughout the vehicle. In response to those inputs, the circuitry and programming of the CCN allow it to control the audible outputs that are produced through its on-board transducer and relay.

The CCN is capable of producing the following audible outputs

1. Slow Rate Repetitive Click - Repeated click tones that are issued at a slow rate of about 90 clicks per minute.
2. Fast Rate Repetitive Click - Repeated click tones that are issued at a fast rate of more than about 180 clicks per minute.
3. Single Chime Tone - A single chime tone.
4. Slow Rate Repetitive Chime - Repeated chime tones that are issued at a slow rate of about 50 chimes per minute.
5. Fast Rate Repetitive Chime - Repeated chime tones that are issued at a fast rate of about 180 chimes per minute.

hard-wired circuitry connects the CCN and the various chime warning system switch and sensor inputs to their modules and to each other through the electrical system of the vehicle. These hard-wired circuits are integral to several wire harnesses, which are routed throughout the vehicle and retained by many different methods. These circuits may be connected to each other, to the vehicle electrical system and to the CCN through the use of a combination of soldered splices, splice block connectors, and many different types of wire harness terminal connectors and insulators. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.

The CCN chime warning system circuits and components cannot be adjusted or repaired. If the CCN circuitry, the on-board transducer or the relay are damaged or ineffective, the unit must be replaced.

Scheme 2

The Blind Spot Monitor (BSM) system is an optional factory-installed electronic driving aid. During driving maneuvers the system alerts the vehicle operator to vehicles located in the alert zones immediately behind and to the left or right of the vehicle which, due to the surrounding rear vehicle structure, might be otherwise difficult to perceive. When an object is detected, the system uses an electromechanical transducer within the cluster and Light Emitting Diode (LED) indicators within the side view mirrors to provide the vehicle operator with visual and audible indications of the presence of other vehicles.

The BSM system includes the following major components, which are described in further detail elsewhere in this service information

1. Electronic Vehicle Information Center (1) - In vehicles equipped with the optional blind spot monitor system, the optional Electronic Vehicle Information Center (EVIC) in the instrument cluster displays textual warnings and error messages and emits audible warnings related to the current operating status of the BSM system and provides an interface that allows the vehicle operator to manually disable or enable the system using the customer programmable features option.
2. Blind Spot Display (2) - Vehicles equipped with the blind spot monitor system have an LED display unit mounted in the side view mirrors. The body of the displays are concealed to the back side of the side view mirrors. Only the amber colored triangle is visible on the outer surface of the mirror glass.
3. Blind Spot Module (3) - Vehicles equipped with the blind spot monitor system include a module which is secured to a mounting bracket by two integrated latches and mounted in the electronic module tub, located beneath the left front seat assembly where it is concealed beneath a cover panel.
4. Blind Spot Sensors (4) - Vehicles equipped with the blind spot system have two radar blind spot sensors that are concealed behind the rear bumper fascia. Each sensor is snapped into an individual molded plastic mounting bracket secured at horizontal intervals located on the back side of the rear bumper fascia directly below the left and right tail lamps.

Hard-wired circuitry connects the various blind spot monitor system components to each other through the electrical system of the vehicle. These hard-wired circuits are integral to several wire harnesses, which are routed throughout the vehicle and retained by many different methods. These circuits may be connected to each other and to the vehicle electrical system through the use of a combination of soldered splices, splice block connectors, and many different types of wire harness terminal connectors and insulators. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.

The blind spot monitor system components cannot be adjusted or repaired. If any of the BSM system components are damaged or inoperative, that component must be replaced.

Scheme 3

A park assist system is an optional factory-installed electronic parking aid. In some markets only a rear park assist system is offered, while other markets may have both front and rear park assist systems available. During parking and other similar vehicle maneuvers, this system alerts the vehicle operator to obstacles located in the path immediately in front of or behind the vehicle which, due to the surrounding vehicle structures, might be otherwise difficult to perceive. When an object is detected, the system uses an electromechanical transducer and Light Emitting Diode (LED) indicators within the appropriate front or rear park assist display unit to provide the vehicle operator with visual and audible indications of the presence and proximity of such objects.

The park assist system includes the following major components, which are described in further detail elsewhere in this service information

1. Electronic Vehicle Information Center (2) - In vehicles equipped with the optional park assist system, the optional EVIC in the instrument cluster displays textual warnings and error messages, and emits audible warnings related to the current operating status of the park assist system. The display also provides an interface that allows the vehicle operator to manually disable or enable the system using the customer programmable features option.
2. Park Assist Module (4) - Vehicles equipped with the park assist system include a park assist module which is concealed within the molded plastic park assist module housing. There are three mounting tabs integral to the module housing that secure the module to the vehicle body. Two connector receptacles containing terminal pins that connect the module to the vehicle electrical system are integral to the one side of the housing. One of the receptacles is utilized in vehicles equipped with only the rear park assist system, while both receptacles are used on vehicles equipped with both the front and rear park assist systems.
3. Park Assist Sensors (1) - Vehicles equipped with the rear park assist system have four ultrasonic park assist sensors that are concealed behind the rear bumper fascia. In addition to the rear sensors, vehicles equipped with the front park assist system have six ultrasonic park assist sensors that are concealed behind the front bumper fascia. Each sensor is snapped into an individual molded plastic mounting bracket located at horizontal intervals along the back side of the front or rear bumper fascias.
4. Park Assist Switch (3) - The optional park assist system can be manually disabled or enabled using a park assist switch that is integral to the switch pod in the instrument panel center stack.

Hard-wired circuitry connects the various park assist system components to each other through the electrical system of the vehicle. These hard-wired circuits are integral to several wire harnesses, which are routed throughout the vehicle and retained by many different methods. These circuits may be connected to each other and to the vehicle electrical system through the use of a combination of soldered splices, splice block connectors, and many different types of wire harness terminal connectors and insulators. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.

The park assist system components cannot be adjusted or repaired. If any of the park assist system components are damaged or ineffective, that component must be replaced.

CHIME WARNING SYSTEM

The chime warning system operates on battery voltage received 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. ABS Indicator Warning - On vehicles equipped with an optional Antilock Brake System (ABS), the instrument cluster, also known as the Cab Compartment Node (CCN) transducer will generate one short chime each time the ABS indicator is illuminated. This warning indicates a failure condition has been monitored affecting the operation of the ABS related components or circuits. This warning will only occur following completion of the ABS indicator bulb test, and will only occur once during any ignition cycle.
2. Adjustable Pedal System Warning - On vehicles equipped with the optional adjustable pedal system, the CCN transducer will generate one short chime each time a pedal adjustment request is received and a PEDAL ADJUST. DISABLED - CRUISE CONTROL SET or a PEDAL ADJUST. DISABLED - SHIFTER IN REVERSE textual message is displayed in the reconfigurable display of the instrument cluster. A single short chime will also be sounded each time a pedal adjustment request is received while a failure condition has been monitored affecting the operation of the adjustable pedal system related components or circuits.
3. Airbag Indicator Warning - The 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 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.
4. Automatic Oil Change Indicator - On vehicles with a gasoline engine, the CCN transducer will generate one short chime each time an OIL CHANGE REQUIRED or OIL CHANGE RESET textual message is displayed in the reconfigurable display of the instrument cluster. This warning indicates that a duty-cycle algorithm contained within the software of the Powertrain Control Module (PCM) has determined that a recommended oil change interval has been attained, or that a reset of the interval has been requested following performance of the recommended service. will only occur once during any ignition cycle.
5. Charging System Indicator Warning - The CCN transducer will generate one short chime each time the ignition switch is in the ON position and the charging system indicator is illuminated. This warning indicates that a failure condition has been monitored affecting the operation of the charging system related components or circuits.
6. Check Gas Cap Warning - On domestic market vehicles with a gasoline engine, the CCN transducer will generate one short chime each time the CHECK GAS CAP textual message is displayed in the reconfigurable display of the instrument cluster. This warning will only occur once during any ignition cycle.
7. Check Gauges Warning - The CCN transducer will generate one short chime each time the CHECK GAUGES textual message is displayed in the reconfigurable display of the instrument cluster. This warning indicates that a gross leak has been detected in the on-board vapor recovery system.
8. Check Engine Indicator Warning - The CCN transducer will generate one short chime when the ignition switch is in the ON position and the check engine (Malfunction Indicator Lamp/MIL) indicator is illuminated. This warning indicates that a failure condition has been monitored affecting the operation of a critical fuel or emissions related component or circuit.
9. Check Shift Procedure Fault Warning - On vehicles equipped with an optional Quadra-Trac II® four-wheel drive transfer case, the CCN transducer will generate one short chime each time the CHECK SHIFT PROCEDURE textual message is displayed in the reconfigurable display of the instrument cluster. This warning indicates that an electronically controlled transfer case shift request has not been successfully completed due to the use of an improper shift procedure. Refer to the owner's manual in the vehicle glove box for the proper electronic transfer case shift procedure.
10. Door Ajar Warning - The CCN transducer will generate one short chime when a DOOR(S) OPEN textual message and icon are displayed in the reconfigurable display 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.
11. Electronic Stability Program/Brake Assist System Warning - On vehicles equipped with the optional Electronic Stability Program (ESP)/Brake Assist System (BAS), the CCN transducer will generate one short chime when the ESP OFF textual message is displayed in the reconfigurable display of the instrument cluster. This warning indicates that the ESP/BAS system has been manually disabled using the ESP switch.
12. Electronic Stability Program/Brake Assist System Fault Warning - On vehicles equipped with the optional Electronic Stability Program (ESP)/Brake Assist System (BAS), the CCN transducer will generate one short chime each time the ESP/BAS indicator is illuminated in the instrument cluster. This warning indicates a failure condition has been monitored affecting the operation of the ESP/BAS related components or circuits. This warning will only occur following completion of the ESP/BAS indicator bulb test, and will only occur once during any ignition cycle.
13. Electronic Stability Program/Traction Control Fault Warning - On vehicles equipped with the optional Electronic Stability Program (ESP)/Traction Control System (TCS), the CCN transducer will generate one short chime each time the traction control indicator is illuminated solid (not flashed) in the instrument cluster. This warning indicates a failure condition has been monitored affecting the operation of the ESP/TCS related components or circuits. This warning will only occur following completion of the traction control indicator bulb test, and will only occur once during any ignition cycle.
14. Fasten Seat Belt Indicator Warning - The CCN transducer will generate repetitive chimes at a slow rate to announce that a hard-wired input from the seat belt switch and the ignition switch indicate that the driver side front seat belt is not fastened with the ignition switch in the ON position. The chime warning system also supports the enhanced seat belt reminder (beltminder) when this feature is enabled. Refer to «INDICATORS, INSTRUMENT CLUSTER , OPERATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#instrument-cluster-service-information) .
15. Four-Wheel Drive System In NEUTRAL Warning - On vehicles equipped with a Quadra-Trac II® transfer case, the CCN transducer will generate one short chime each time the 4WD SYSTEM IN NEUTRAL textual message is displayed in the reconfigurable display of the instrument cluster. This warning confirms that a NEUTRAL shift request for the electronically controlled transfer case has been successfully completed.
16. Gate Ajar Warning - The CCN transducer will generate one short chime when a LIFTGATE OPEN textual message and icon are displayed in the reconfigurable display of the instrument cluster. This warning indicates that the liftgate is not closed or completely latched while the vehicle is moving.
17. Glass Ajar Warning - The CCN transducer will generate one short chime when a LIFTGLASS OPEN textual message and icon are displayed in the reconfigurable display of the instrument cluster. This warning indicates that the liftgate flip-up glass is not closed or completely latched while the vehicle is moving.
18. Head/Park Lamps-ON Warning - The CCN transducer will generate repetitive chimes at a fast rate to indicate that hard-wired 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 either a hard-wired input or an electronic message is received over the CAN data bus 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.
19. Hood Ajar Warning - On vehicles sold in a market where a hood ajar switch is required equipment, the CCN transducer will generate one short chime each time a HOOD OPEN textual message and icon are displayed in the reconfigurable display of the instrument cluster. This warning indicates that the hood is not closed or completely latched while the vehicle is moving.
20. Ignition-Off Draw (IOD) Fuse Out Warning - The CCN transducer will generate one short chime each time the ignition switch is in the ON or START positions and an IOD FUSE OUT textual message is displayed in the reconfigurable display of the instrument cluster. This warning indicates that the IOD fuse is missing or ineffective.
21. Key-In-Ignition Warning - The CCN transducer will generate repetitive chimes at a fast rate to indicate that hard-wired inputs from the key-in ignition switch and the ignition switch indicate that the key is in the ignition lock cylinder with the ignition switch in the OFF position, and either a hard-wired input or an electronic message is received over the CAN data bus indicating that the driver side front door is 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.
22. Low Brake Fluid Warning - The CCN transducer will generate one short chime when a LOW BRAKE FLUID LEVEL textual message is displayed in the reconfigurable display of the instrument cluster. This warning indicates that the monitored fluid level in the brake master cylinder is low.
23. Low Coolant Warning - The CCN transducer will generate one short chime when the COOLANT LOW textual message and icon are displayed in the reconfigurable display of the instrument cluster. This warning indicates that the monitored engine coolant level in the coolant reserve bottle is low. This chime will only occur once during any ignition cycle.
24. Low Fuel Warning - The CCN transducer will generate one short chime when the FUEL LOW textual message and icon are displayed in the reconfigurable display of 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.
25. Low Oil Pressure Indicator Warning - The CCN transducer will generate one short chime when the low oil pressure indicator is illuminated and the engine speed is greater than 300 revolutions per minute. This warning indicates that the monitored engine oil pressure is low.
26. Low Wash Warning - The CCN transducer will generate one short chime when the WASHER FLUID LOW textual message and icon are displayed in the reconfigurable display of the instrument cluster. This warning indicates that the monitored washer fluid level in the washer reservoir is low.
27. Memory System Warning - On vehicles equipped with the optional memory system, the CCN transducer will generate one short chime each time a memory recall request is received and a MEMORY SYSTEM DISABLED - SEATBELT FASTENED textual message and icon, or a MEMORY SYSTEM DISABLED - VEHICLE NOT IN PARK textual message is displayed in the reconfigurable display of the instrument cluster. A single short chime will also be sounded each time a memory recall request is received while the memory system is inhibited due to a vehicle speed input that is greater than zero.
28. Overspeed Warning - The CCN transducer will generate repetitive chimes at a slow rate when the WARNING! LIMIT SPEED textual message is displayed in the reconfigurable display of the instrument cluster. This warning indicates that 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).
29. Park Assist System Warning - On vehicles equipped with the optional park assist system, the EMIC transducer will generate one short chime when the PARK ASSIST DISABLED textual message is displayed in the reconfigurable display of the instrument cluster. This warning indicates that the park assist system has been manually disabled using the park assist switch. On vehicles with only the rear park assist system this chime warning will only occur as the gear selector lever is being moved from any position except REVERSE or NEUTRAL into REVERSE or NEUTRAL. On vehicles with the front and rear park assist systems this warning will only occur as the gear selector lever is being moved from the PARK position into the REVERSE position.
30. Park Brake Reminder - The 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 only occur once during any ignition cycle.
31. Perform Service Reminder - On vehicles equipped with a diesel engine, the CCN transducer will generate one short chime when the PERFORM SERVICE textual message is displayed in the reconfigurable display of the instrument cluster. This reminder occurs when the service distance is at or below zero (miles or kilometers), and will repeat at each subsequent ignition cycle until the service distance is reset, increased or until the service reminder function is disabled. This chime will only occur once during any ignition cycle.
32. Power Liftgate Indicator Warning - On vehicles equipped with an optional power-operated liftgate, the CCN transducer will generate one short chime when a UNLOCK TO OPERATE, PUT IN PARK TO OPERATE, FUNCTION DISABLED, CLOSE LIFTGLASS, OBSTACLE DETECTED, or MANUAL CLOSE TO OPERATE textual error message is displayed in the reconfigurable display of the instrument cluster. This message indicates that the power liftgate is inoperable due to the displayed error condition.
33. Remote Keyless Entry System Warning - The CCN transducer will generate one short chime when a SERVICE KEYLESS SYS., KEY FOB NOT DETECTED, VEHICLE NOT IN PARK, or VEHICLE NOT IN REVERSE textual error message is displayed in the reconfigurable display of the instrument cluster. This message indicates that a Passive Entry and Keyless Go (PEKG) system feature is inoperable due to the displayed error condition.
34. FOBIK PROGRAMMING. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information__standard-procedure) .
35. Service Column Lock Warning - On right-hand drive vehicles manufactured with the electronic steering column lock, the CCN transducer will generate one short chime each time the SERVICE COLUMN LOCK textual message is displayed in the reconfigurable display of the instrument cluster. This warning indicates that a failure condition has been monitored affecting the operation of the electronic steering column lock components or circuits.
36. Service Exhaust Warning - On vehicles equipped with a diesel engine, the CCN transducer will generate one short chime each time the SERVICE EXHAUST textual message is displayed in the reconfigurable display of the instrument cluster. This warning indicates that a clogged or damaged diesel engine exhaust particulate filter has been monitored, which may affect diesel engine performance and emissions. This chime will only occur once during any ignition cycle.
37. Service Four-Wheel Drive Warning - On vehicles equipped with an optional Quadra-Trac II® four-wheel drive transfer case, the CCN transducer will generate one short chime each time the SERVICE 4WD SYSTEM textual message is displayed in the reconfigurable display of the instrument cluster. This warning indicates a failure condition has been monitored affecting the operation of the electronically controlled transfer case related components or circuits.
38. Service Park Assist System Warning - On vehicles equipped with the optional park assist system, the CCN transducer will generate one short chime each time the SERVICE PARK ASSIST SYSTEM textual message is displayed in the reconfigurable display of the instrument cluster. This warning indicates a failure condition has been monitored affecting the operation of the park assist system related components or circuits.
39. Service Tire Pressure Monitor System Warning - On vehicles equipped with an optional base or premium Tire Pressure Monitor (TPM) system, the CCN transducer will generate one short chime each time a SERVICE TIRE PRESS. SYSTEM textual message is displayed in the reconfigurable display of the instrument cluster. This warning indicates a failure condition has been monitored affecting the operation of the tire pressure monitor system related components or circuits.
40. Tire Pressure Monitor Warning - On vehicles equipped with an optional base or premium Tire Pressure Monitor (TPM) system, the CCN transducer will generate one short chime each time a LOW PRESSURE textual message is displayed in the reconfigurable display of the instrument cluster. This warning indicates that a low pressure condition has been monitored in one of the tires on or in the vehicle.
41. Trans Overtemp Warning - The CCN transducer will generate one short chime each time the TRANSMISSION OVER TEMP textual message is displayed in the reconfigurable display of the instrument cluster. This warning indicates that the fluid temperature in the automatic transmission is excessive. This chime will repeat each time the trans overtemp message is cycled from OFF to ON.
42. Turn Signal/Hazard Warning Flasher Emulation - The CCN relay will generate repetitive clicks at a slow rate to emulate an electromechanical flasher when the turn signal or hazard warning system are operating. The CCN relay will generate repetitive clicks at a fast rate to indicate that the right or left turn signal are operating with one or more bulbs ineffective. In either case, the clicks will continue until the turn signal and hazard warning systems are turned OFF.
43. Turn Signal On Warning - The CCN transducer will generate one short chime and a TURN SIGNAL ON textual message with a blinking right or left turn signal icon are displayed in the reconfigurable display of the instrument cluster. This warning indicates 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). The hazard warning flashers will not activate this chime feature.

The 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 CCN relies on 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 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 the appropriate wiring information. 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.

BLIND SPOT MONITOR SYSTEM

The Blind Spot Monitor (BSM) system is active only when the ignition switch is in the ON or START positions, the transmission gear selector lever is in the DRIVE or NEUTRAL position and the vehicle speed is greater than 10 kilometers-per-hour (6 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 the customer programmable features option of the optional Electronic Vehicle Information Center (EVIC) in the instrument cluster.

The BSM system provides another feature called Rear Cross Path (RCP). The RCP feature is active only when the gear selector is in the reverse position. The RCP feature is intended to aid the driver when backing out of parking spaces where vision of oncoming vehicles may be blocked. The host vehicle must proceed slowly and cautiously out of the parking space until the rear end of the vehicle is exposed. The RCP system will then have a clear view of the cross traffic and if an on coming vehicle is detected, alert the driver. The RCP monitors the rear detection zones on both sides of the vehicle, for objects that are moving toward the side of the vehicle with a minimum speed of 1 to 2 mph (1 km/h to 3 km/h), to objects moving a maximum of 10 mph (16 km/h), such as in parking lot situations.

The microprocessor based blind spot monitor module is the central component of the BSM system. It receives and analyzes data from the sensors, calculates and communicates the proper information to the Driver/Passenger door module to illuminate the 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 and eyelet terminal of the body wire harness that is secured by a screw to the body sheet metal.

Two BSM radar sensors in the rear bumper fascia allow the blind spot monitor system to locate and identify nearby obstacles. The width of the BSM detection zone covers one lane over on both side of the vehicle, approximately 13ft (4.0m). The length of the BSM zone starts at the outside rear view mirror and extends approximately 15ft (4.5m) from the edge of the rear bumper.

The BSM display units, located within the side view mirrors, provide the vehicle operator with a visual warning indicating that an object has been detected within one of the vehicles detection zones. The BSM display ICON is illuminated immediately if an object of interest is in the detection zone and meets the warning criteria. However, the BSM system will not illuminate the ICON if the object of interest from the rear of the zone and passes the host vehicle at a speed greater that 31mph (50kph), or enters the detection zone from the front of the zone and remains in the zone for less than 1.5 seconds or passes through the zone with a relative speed greater than 12mph (20kph), or if the target vehicle passes the host vehicle in the opposite direction.

The BSM audible alert, is a single chime tone that can also be enabled. The chime tone is only sounded when the turn signal is activated and an object of interest is in the detection zone on the same side and meets the warning criteria. The chime tone is not active during normal driving conditions unless the turn signal is activated. The BSM system also sends a radio mute signal over the CAN data bus to the radio when the chime tone is activated. This request signal activates the radio mute function while the chime tone is sounded, approximately 2 to 3 seconds, then resumes normal radio function. The audible alert my also be deactivated if the operator prefers using the driver preferences within the EVIC. The BSM system can be configured for lights and chime, lights only, and system off.

The RCP function uses the same BSM icon and audible chime. However, the RCP function always combines the BSM display with the audible chime if an object is detected within the RCP detection zone. The BSM icon is illuminated on the side where the object is detected and a rapid repeating short chime tone is sounded. The audible chime can not be deactivated in the RCP function.

When the BSM module monitors a problem in any of the system circuits or components, it stores a fault code or Diagnostic Trouble Code (DTC) in its memory circuit, sends an electronic message to the instrument cluster, and a SERVICE BLIND SPOT SYSTEM or BLIND SPOT SYSTEM TEMPORARILY UNAVAILABLE textual message is displayed in the EVIC display.

The hardwired circuits between components related to the blind spot monitor system may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. 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 blind spot monitor system or the electronic controls or communication between modules and other devices that provide some features of the system. The most reliable, efficient, and accurate means to diagnose the blind spot monitor system or the electronic controls and communication related to BSM 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 either the REVERSE position and the vehicle speed is less than 16 kph (10 mph) or, the DRIVE position and the vehicle speed is less 14 kph (8 MPH) on deceleration, or 18 kph (12 mph) on acceleration. The park assist system is enabled from the factory as a default but can be disabled or enabled using the personal settings menu of the Electronic Vehicle Information Center (EVIC). For more information on EVIC operation, refer to CENTER, ELECTRONIC VEHICLE INFORMATION , OPERATION .

The disable feature is provided for trailer towing purposes. 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. When the system is disabled, a park assist icon will appear within the display. On vehicles equipped with an optional EVIC, a PARK ASSIST OFF textual message will appear within the EVIC display of the instrument cluster 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, receives and analyzes data from the sensors, calculates and communicates the proper display information to the Cab Compartment Node (CCN), 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 2.0 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, located within the EVIC unit, provides the vehicle operator with a visible warning if the vehicle comes to within about 40 centimeters (31 inches) of the detected object. The display is visible to the vehicle operator only when looking forward and an object is detected within the detection zone. The system will also emit a series of short, intermittent, audible beeps and automatically mute the audio system while the park assist audible warning is being generated, if the audio system is turned ON. The audible warning changes from intermittent beeps to a continuous tone as 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, sends an electronic message to the CCN, 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 the appropriate wiring information. 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 the appropriate wiring information. 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.

The following textual message May appear within the Electronic Vehicle Information Center (EVIC)

1. BLIND SPOT SYSTEM OFF - Message to the vehicle operator at "Key ON" to indicate the system has been turned off.
2. SERVICE BLIND SPOT SYSTEM - Message indicates that the BSM system is permanently unavailable. An EVIC message will be displayed and the BSM warning display in both mirrors will be permanently illuminated. This may be due to a hardware failure.
3. BLIND SPOT SYSTEM TEMPORARILY UNAVAILABLE - Message indicates that the BSM system is temporarily unavailable as a result of one of the following reasons: Sensor blockage - BSM display in both mirrors will illuminate as long as blockage exists. Radar interference - BSM display ICON will illuminate ONLY on the side of the interference during the first 15 seconds of interference. If the interference remains present, the system will illuminate the opposite side ICON and send a "temporarily Unavailable" message. Sensor over temperature - BSM display in both mirrors will illuminate as long as condition exists.

Note. If the "BLIND SPOT SYSTEM TEMPORARILY UNAVAILABLE" message is received for a minimum of 5 minutes, please verify that the area of the rear fascia where the sensors are located is not blocked by snow, ice or road debris. If the area is blocked, remove the blockage and verify the message is no longer present in the EVIC display.

Note. If the vehicle has experienced any trauma in the area where the sensors are located, even if the fascia is not damaged, the sensor may have become misaligned. A misaligned sensor will result in the BSM system to not operate properly.

The hard-wired circuits between components related to the blind spot monitor system may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. 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 blind spot monitor system or the electronic controls or communication between modules and other devices that provide some features of the system. The most reliable, efficient, and accurate means to diagnose the blind spot monitor system or the electronic controls and communication related to BSM system operation requires the use of a diagnostic scan tool. Refer to the appropriate Diagnostic information.

The following textual messages May appear in the Electronic Vehicle Information Center (EVIC)

1. SERVICE PARK ASSIST - If a service park assist textual message appears in the EVIC display, be certain to confirm the following: The parking brake is not applied. The rear bumper is free of ice, snow, mud or other obstructions that will prevent the system from operating properly. The park assist system is self correcting, please verify that the area of the rear bumper where the sensors are located is not blocked by ice, snow, mud or other obstructions. If the area is blocked, remove the blockage, shift the transmission selector lever into reverse and verify the message is no longer present in the EVIC display. The system may also be corrected when the vehicle is driven at a speed greater than 14 kph (8 mph). NOTE: The presence of jackhammers, large trucks, and other vibrations in the vicinity of the vehicle could impact the performance of the system.
2. PARK ASSIST DISABLED - If a park assist disabled textual message appears in the EVIC display, the system may either be manually cut-off or have a hard fault. If the manual cut-off switch is not illuminated further investigation may be needed.

The hard wired circuits between components related to the park assist system may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. 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.

DESCRIPTION

Vehicles equipped with the Blind Spot Monitor (BSM) system have an Light Emitting Diode (LED) display unit mounted in the side view mirrors. The body of the displays are concealed to the back side of the side view mirror glass. Only the amber colored triangle is visible on the outer surface of the mirror glass. The BSM display units are an integral part to the mirror glass and are only serviced with the glass. For service information, refer to MIRROR, OUTSIDE REARVIEW , REMOVAL MIRROR, OUTSIDE REARVIEW, GLASS , REMOVAL .

Hard-wired circuitry connects the various blind spot monitor system components to each other through the electrical system of the vehicle. These hard-wired circuits are integral to several wire harnesses, which are routed throughout the vehicle and retained by many different methods. These circuits may be connected to each other and to the vehicle electrical system through the use of a combination of soldered splices, splice block connectors, and many different types of wire harness terminal connectors and insulators. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.

The blind spot monitor system components cannot be adjusted or repaired. If any of the BSM system components are damaged or inoperative, that component must be replaced. For more information on the blind spot monitor system and its components, refer to DESCRIPTION .

OPERATION

The Blind Spot Monitor (BSM) display units, located within the side view mirrors, provide the vehicle operator with a visual warning indicating that an object has been detected within one of the vehicles detection zones. The BSM display ICON is illuminated immediately if an object of interest is in the detection zone and meets the warning criteria. However, the BSM system will not illuminate the ICON if the object of interest from the rear of the zone and passes the host vehicle at a speed greater that 31mph (50kph), or enters the detection zone from the front of the zone and remains in the zone for less than 1.5 seconds or passes through the zone with a relative speed greater than 12mph (20kph), or if the target vehicle passes the host vehicle in the opposite direction. For more information on the BSM display and other components in the system, refer to OPERATION .

The Park Assist display is an integral part of the Electronic Vehicle Information Center (EVIC). The park assist ICON , for image information, is only displayed when an object is detected. Refer to INTERNATIONAL VEHICLE CONTROL AND DISPLAY SYMBOLS , DESCRIPTION . An electronic message is sent to the Cab Compartment Node (CCN) from the park assist module, over the Controller Area Network (CAN) Data Bus when an object is within the detection area. The CCN then displays the object detection icon with the corresponding alert bar for the distance and location of the object within the EVIC display.

Depending on market and system capabilities, the display icon has as many as 24 different variations with the corresponding alert bars, depending on size, location and distance of the object being detected. The image will display three solid bars followed by a single tone for maximum distance then will flash and reduce the amount of bars as the proximity to the object is reduced followed by a repetitive tone, down to a single bar with a continuous tone.

The EVIC display is only serviced as a complete unit with the instrument cluster. It cannot be adjusted or repaired. If ineffective or damaged, the entire display unit must be replaced, for more information, refer to CENTER, ELECTRONIC VEHICLE INFORMATION , DESCRIPTION .

The Park Assist system for this vehicle is only available on vehicles equipped with an Electronic Vehicle Information Center (EVIC). The park assist display is an integrated part of the EVIC and receives battery current and ground from, and is completely controlled by, the Cab Compartment Node (CCN). The CCN will display the park assist ICON whenever an object is detected and a signal is received from the park assist module, over the Controller Area Network (CAN) data bus. The icon image displayed has as many as 24 different variations depending on size, distance and location of the object being detected. The microprocessor in the park assist module 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 hard-wired circuits between components related to the park assist display may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. 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 4

Blind Spot Module (1) - Vehicles equipped with the blind spot monitor system include a module which is secured to a mounting bracket by two integrated latches and mounted in the electronic module tub (2), located beneath the left front seat assembly where it is concealed beneath a cover panel.

Hard-wired circuitry connects the various blind spot monitor system components to each other through the electrical system of the vehicle. These hardwired circuits are integral to several wire harnesses, which are routed throughout the vehicle and retained by many different methods. These circuits may be connected to each other and to the vehicle electrical system through the use of a combination of soldered splices, splice block connectors, and many different types of wire harness terminal connectors and insulators. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.

The blind spot monitor system components cannot be adjusted or repaired. If any of the BSM system components are damaged or inoperative, that component must be replaced. For more information on the blind spot monitor system and its components, refer to DESCRIPTION .

The microprocessor based Blind Spot Monitor (BSM) module is the central component of the BSM system. It receives and analyzes data from the sensors, calculates and communicates the proper information to the Driver/Passenger door module to illuminate the 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 and eyelet terminal of the body wire harness that is secured by a screw to the body sheet metal. For more information on the operation of the BSM module and other components in the BSM system, refer to OPERATION .

REMOVAL

1. Position the left front seat to its full forward position.
2. Disconnect and isolate the negative battery cable. For battery location and disconnect procedure, refer to «CABLES, BATTERY , REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/charging-system/#battery-system-service-information) .
3. Remove the cover panel from the electronic module tub (2) to access the blind spot module (1).
4. Disconnect the body wire harness connector (3) from the module connector receptacle (4).
5. Release integral latches that secures the module to the mounting bracket and slide the module upward.
6. Remove the module from the vehicle.

INSTALLATION

1. Position the blind spot module (1) in the mounting bracket.
2. Slide the module into place until the locking tabs are secure.
3. Connect the body wire harness connector (3) to the module connector receptacle (4).
4. Install the cover panel onto the electronic module tub.
5. Connect the negative battery cable. For battery location and cable connection procedure, refer to «CABLES, BATTERY , INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/charging-system/#battery-system-service-information) .

The Park Assist Module for this vehicle is secured on the inboard side of the right rear quarter panel behind the interior quarter trim panel. The module is connected to the vehicle electrical system through dedicated take outs of the body wire harness.

Scheme 5

Concealed within the molded plastic park assist module housing (1) is a microprocessor and the other electronic circuitry of the module. The module housing is sealed to enclose and protect the internal electronic circuitry. The module software is flash programmable.

There are three mounting tabs (2 and 5) integral to the module housing that secure the module to the vehicle body. The two lower (5) tabs secure the module in place by engaging two slots in the vehicle body. The upper tab (2) is secured by a push-pin type retainer. Three connector receptacles (3 and 4) containing terminal pins that connect the module to the vehicle electrical system are integral to the one side of the housing. Two of the receptacles are utilized in vehicles equipped with only the rear park assist system, while three receptacles are used on vehicles equipped with both the front and rear park assist systems.

The park assist module cannot be adjusted or repaired and, if damaged or ineffective, it must be replaced.

The microprocessor in the Park Assist module contains the logic circuits that control the park assist system. The module uses On-Board Diagnostics (OBD) and can communicate with other electronic modules in the vehicle as well as with the diagnostic scan tool using the Controller Area Network (CAN) data bus. This method of communication is also used for park assist system diagnosis and testing through the 16-way data link connector located on the driver side lower edge of the instrument panel.

The module provides voltage to each of the park assist sensors located behind the front and rear bumper fascias and to the front and rear park assist displays. The module then monitors return inputs from each of the sensors and the displays on dedicated hard-wired data communication circuits. The sensor inputs allow the module to determine when an obstacle is in the front or rear path of the vehicle and enables the module to calculate the relative location of the obstacle, and whether the distance to that obstacle is increasing or decreasing.

Pre-programmed decision algorithms and calibrations allow the module microprocessor to determine the appropriate park assist system outputs based upon the inputs received from the park assist sensors and electronic messages received from other modules in the vehicle over the CAN data bus. When the programmed conditions are met the module sends electronic messages to the park assist displays over a dedicated serial bus to obtain the proper park assist system visual and audible outputs. The module also broadcasts electronic messages over the CAN data bus to enable the other electronic features of the park assist system.

The park assist module microprocessor continuously monitors all of the park assist system electrical circuits and components to determine the system readiness. If the module detects a monitored system fault, it sets a Diagnostic Trouble Code (DTC) and sends the appropriate electronic messages to the instrument cluster over the CAN data bus to control operation of certain park assist system audible warnings and textual messages displayed in the reconfigurable display of the instrument cluster.

The park assist module receives battery current on a fused ignition switch output (run-start) circuit through a fuse in the Total Integrated Power Module (TIPM). The module receives ground through a ground circuit and take out of the underbody wire harness. These connections allow the module to be operational whenever the ignition switch is in the START or ON positions.

The hard-wired circuits between components related to the park assist module may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. 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 module 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 module or the electronic controls and communication related to park assist module operation requires the use of a diagnostic scan tool. Refer to the appropriate Diagnostic information.

Scheme 6

1. Disconnect and isolate the negative battery cable.
2. Remove the right quarter interior trim panel. Refer to «PANEL, QUARTER TRIM , REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
3. Disconnect the body wire harness connector (3) from the park assist module connector receptacle (4). Vehicles with the front park assist option will have a second connection to the module at this location, which must also be disconnected.
4. Remove the fasteners that secure the park assist module (1) to the inner quarter panel (2).
5. Remove the module from the vehicle.

1. Position the park assist module (1) to the right inner quarter panel (2) and install the fasteners.
2. Connect the body wire harness connector (3) to the module connector receptacle (4). Vehicles with the front park assist option will have a second connection to the module at this location, which must also be reconnected.
3. Install the right quarter interior trim panel. Refer to «PANEL, QUARTER TRIM , INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/gauges-instrument-panels/#body-interior-exterior) .
4. Connect the negative battery cable.

Scheme 7

Blind Spot Sensors (2) - Vehicles equipped with the blind spot monitoring system have two radar blind spot sensors that are concealed behind the rear bumper fascia. Each sensor is snapped into an individual molded plastic mounting bracket (3) secured at horizontal intervals located on the back side of the rear bumper fascia directly below the left and right tail lamps.

Hard-wired circuitry connects the various blind spot monitor system components to each other through the electrical system of the vehicle. These hard-wired circuits are integral to several wire harnesses, which are routed throughout the vehicle and retained by many different methods. These circuits may be connected to each other and to the vehicle electrical system through the use of a combination of soldered splices, splice block connectors, and many different types of wire harness terminal connectors and insulators. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.

The blind spot monitor system components cannot be adjusted or repaired. If any of the BSM system components are damaged or inoperative, that component must be replaced. For more information on the blind spot monitor system and its components, refer to DESCRIPTION .

Two Blind Spot Monitor (BSM) radar sensors in the rear bumper fascia allow the blind spot monitor system to locate and identify nearby obstacles. The width of the BSM detection zone covers one lane over on both side of the vehicle, approximately 13ft (4.0m). The length of the BSM zone starts at the outside rear view mirror and extends approximately 15ft (4.5m) from the edge of the rear bumper. For more information on the BSM sensors and other components in the system, refer to OPERATION .

Scheme 8

Note. The sensor brackets are bonded to and integral to the back side of the rear bumper fascia.

1. Disconnect and isolate the negative battery cable.
2. Remove the bumper fascia (1) from the rear of the vehicle. Refer to «FASCIA, REAR , REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) .
3. From the back of the fascia, disconnect the wire harness connector (3) from the blind spot monitor sensor (2) connector receptacle.
4. Carefully pry the sensor bracket latch features away from the top and bottom latch tabs of the sensor far enough to disengage the sensor from the bracket and remove the sensor.

Scheme 9

Note. The sensor brackets are bonded to and integral to the back side of the rear bumper fascia.

1. Align and insert the sensor (6) into the sensor bracket on the back of the rear bumper fascia (2) until the bracket latch features are fully engaged over the top and bottom latch tabs of the sensor.
2. From the back of the fascia, reconnect the wire harness connector (5) to the sensor connector receptacle.
3. Reinstall the bumper fascia onto the rear of the vehicle. Refer to «FASCIA, REAR , INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) .
4. Reconnect the negative battery cable.

Scheme 10

Vehicles equipped with the rear park assist system have four park assist sensors (1) installed on the rear bumper fascia. Vehicles with the front park assist system have six additional sensors installed on the front bumper fascia. Only the membrane (4) of each sensor is visible through a hole in the outer vertical surface of the fascia. The remainder of each sensor including the sensor mounting bracket, the sensor spacer and the sensor wiring connection is concealed behind the fascia. A sensor wire harness behind the fascia connects the sensors to the vehicle electrical system.

Each of the sensors is identical in construction and is interchangeable. The electronic circuitry and a communication chip for each sensor is enclosed and protected within the molded black plastic sensor housing. The housing includes an integral connector receptacle (3) and two integral mounting tabs (2). The sensor membrane extends from the surface of the sensor housing, and is either black or is finished to match the outer surface of the fascia or fascia molding.

Scheme 11

The numbering system for the park assist sensors allows for up to twelve sensors on the vehicle, six front and six rear. However, only ten are utilized on this specific vehicle. The sensors are numbered in a clockwise manner starting at the left front bumper. The left front sensor (if equipped with front park assist) is the number 1 sensor. The numbering continues in a clockwise direction around the vehicle, so the left rear sensor is the number 11 sensor.

A resilient O-ring spacer around the circumference of the membrane isolates the membrane from the openings in the fascia or the fascia molding. Each sensor is snapped into its own dedicated molded plastic mounting bracket. Each rear mounting bracket has integral mounting tabs that snap into openings in the horizontal tabs of the molding that extend through slots to the back side of the rear fascia. The front mounting brackets are heat-staked to the back side of the front fascia.

The park assist sensors cannot be adjusted or repaired. If ineffective or damaged they must be replaced. The sensors, the spacers and the four rear sensor mounting brackets are each available for individual service replacement.

The park assist sensors are ultrasonic transceivers that are completely controlled by the park assist module. The sensors transmit and receive ultrasonic signals. The sensors each receive battery current and ground in parallel from the module, but are each connected to individual dedicated serial bus communication circuits to the module.

Each sensor membrane is oscillated, then quieted by the module in a pulsing fashion. While the sensor membrane oscillates, it emits an ultrasonic signal. This signal will bounce or echo off of objects in the path of the vehicle. While quieted, each membrane receives the echoes of the ultrasonic signals it and the other sensors have transmitted. The sensors then communicate this echo data over the serial bus lines back to the module. The microprocessor in the module uses the intervals between the ultrasonic transmission and reception data from the sensors to calculate the distance to any obstacles identified by the ultrasonic echoes.

The hard wired circuits between components related to the park assist sensors may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. 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 sensors 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 sensors or the electronic controls and communication related to park assist sensor operation requires the use of a diagnostic scan tool. Refer to the appropriate Diagnostic information.

Scheme 12

Note. The park assist sensors (3) and the sensor spacers (2) are each available for separate service replacement. The sensor brackets (1) are bonded and integral to the back side of the front bumper fascia (4).

1. Disconnect and isolate the battery negative cable.
2. Remove the bumper fascia from the front of the vehicle. Refer to «FASCIA, FRONT , REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) .
3. From the back of the fascia (4), disconnect the wire harness connector from the park assist sensor (3) connector receptacle.
4. Carefully pry the sensor bracket (1) latch features away from the top and bottom tabs of the sensor far enough to disengage the sensor from the bracket.
5. Disengage the O-ring spacer (2) from around the circumference of the sensor membrane protrusion.

REAR

Note. The park assist sensors, the sensor spacers and the sensor brackets are each available for separate service replacement. The following service procedure can be used for disassembling any or all of these components from the rear bumper fascia.

Scheme 13

Scheme 14

1. Disconnect and isolate the battery negative cable.
2. From the back of the fascia, disconnect the wire harness connector from the park assist sensor connector receptacle (1).
3. Carefully pry the sensor bracket latch features (2) away from the top and bottom tabs of the sensor far enough to disengage the sensor from the bracket.
4. Separate the sensor spacer (2) from the sensor.

FRONT

Note. The park assist sensors (3) and the sensor spacers (2) are each available for separate service replacement. The sensor brackets (1) are bonded and integral to the back side of the front bumper fascia (4).

1. Engage the O-ring spacer (2) around the circumference of the sensor (3) membrane protrusion. NOTE: Production and all service replacement O-ring spacers are tapered. The wide side (base) of the O-ring should be seated against the sensor housing and the narrow side should be oriented toward the outer surface of the sensor membrane and the front fascia.
2. Align and insert the sensor into the sensor bracket (1) on the back of the front bumper fascia (4) until the bracket latch features are fully engaged over the top and bottom tabs of the sensor. Be certain that the sensor membrane is flush with the outer surface of the fascia. NOTE: Be certain that each sensor membrane is properly centered in the openings of the front fascia and that the O-ring spacers are not pinched. Improper centering or pinched O-rings can be detrimental to proper park assist sensor operation.
3. From the back of the fascia, reconnect the wire harness connector to the sensor connector receptacle.
4. Reinstall the bumper fascia onto the front of the vehicle. Refer to «FASCIA, FRONT , INSTALLATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/frames-subframes-crossmembers/#frame-and-bumpers) .
5. Reconnect the battery negative cable.

Note. The park assist sensors and the sensor O-ring spacers are each available for separate service replacement. The following service procedure can be used for reassembling any or all of these components to the rear bumper fascia.

Note. Production and all service replacement O-ring spacers are tapered. The wide side (base) of the O-ring should be seated against the sensor housing and the narrow side should be oriented toward the outer surface of the sensor membrane and the rear fascia molding.

1. If the park assist sensor (3) or the sensor spacer (2) are being replaced, engage the O-ring spacer around the circumference of the sensor membrane protrusion. NOTE: Be certain that each sensor membrane is properly centered in the openings of the rear fascia molding and that the O-ring spacers are not pinched. Improper centering or pinched O-rings can be detrimental to proper park assist sensor operation.
2. Align and insert the sensor into the sensor bracket on the back of the rear bumper fascia until the bracket latch features (2) are fully engaged over the top and bottom tabs of the sensor. Be certain that the sensor membrane is flush with the outer surface of the fascia molding.
3. From the back of the fascia, reconnect the wire harness connector to the sensor connector receptacle (1).
4. Reconnect the battery negative cable.

Scheme 15

The Park Assist switch (4) is integral to the instrument panel switch pod (1), which is secured to the instrument panel center bezel just below the heater and air conditioner controls. The park assist switch push button is clearly identified with a white International Control and Display Symbol graphic for Parking Aid and the text OFF . An amber Light Emitting Diode (LED) unit is illuminated behind a small clear plastic jewel-like lens in the push button to give a visual indication whenever the park assist system has been manually disabled with the ignition switch in the ON or START positions. The switch button also has panel lamps dimmer controlled illumination for night visibility.

All of the circuitry and components of the park assist switch are contained within a molded black plastic upper instrument panel switch pod housing. A single connector receptacle is integral to the back of the switch pod housing. The switch is connected to the vehicle electrical system through a dedicated take out and connector of the instrument panel wire harness.

The park assist switch cannot be adjusted or repaired and, if the switch is ineffective or damaged, the entire instrument panel switch pod unit must be replaced. Refer to POD, SWITCH , REMOVAL .

The status of the park assist switch is continually monitored by the circuitry within the upper instrument panel switch pod. The switch pod receives battery voltage at all times on a fused battery feed circuit, and a path to ground at all times through the instrument panel wire harness. The inputs to and outputs from the switch pod consist of electronic communication with the instrument cluster, also known as the Cab Compartment Node (CCN) over the single wire Local Interface Network (LIN) data bus.

Each time the park assist switch push button is depressed the switch pod circuitry sends an electronic park assist switch status message input to the CCN over the LIN data bus. The CCN then sends an electronic park assist switch request message to the park assist module over the Controller Area Network (CAN) data bus. The park assist module responds to each park assist switch request message by toggling the status of the park assist system from enabled to disabled, or from disabled to enabled, then sends an electronic park assist system status message back to the CCN over the CAN data bus as confirmation.

The CCN responds to the system status message by sending a message to the switch pod over the LIN data bus to control the park assist switch Light Emitting Diode (LED) unit so that the LED is illuminated with the system disabled and the ignition switch in the ON or START positions, and is extinguished with the system enabled or with the ignition switch in any position except ON or START.

The hard wired circuits between components related to the park assist switch may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of 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 switch or the electronic controls and communication related to park assist switch operation requires the use of a diagnostic scan tool. Refer to the appropriate Diagnostic information.

See also:
• INDICATORS, INSTRUMENT CLUSTER , OPERATION
• STANDARD PROCEDURE
• CENTER, ELECTRONIC VEHICLE INFORMATION , OPERATION
• WARNING
• MIRROR, OUTSIDE REARVIEW , REMOVAL
• INTERNATIONAL VEHICLE CONTROL AND DISPLAY SYMBOLS , DESCRIPTION
• CENTER, ELECTRONIC VEHICLE INFORMATION , DESCRIPTION
• CABLES, BATTERY , REMOVAL
• FASCIA, REAR , REMOVAL
• DESCRIPTION
• OPERATION