Parking Aid System: Other Ford Expedition II

Navigator

The parking aid system consists of the following

1. One radar sensor (located in the center of the rear bumper)
2. Two ultrasonic parking aid sensors (located on the left and right side of the rear bumper)
3. Parking aid module (PAM) (located behind the LH C-pillar trim panel)
4. Parking aid speaker-audible warning tone (located in the parking aid module)
5. Reverse gear select input (to the parking aid module from reverse lamp circuit)

Expedition

The parking aid system consists of the following

1. Four ultrasonic parking aid sensors (located in the rear bumper)
2. Parking aid module (PAM) (located behind the LH C-pillar trim panel)
3. Parking aid speaker-audible warning tone (located in the parking aid module)

Parking Aid - Reverse Sensing System

Refer to SYSTEM WIRING DIAGRAMS (Navigator) or SYSTEM WIRING DIAGRAMS (Expedition) for schematic and connector information.

Scheme 27

The parking aid system detects objects behind the vehicle when the vehicle is in reverse gear. The parking aid module does this by calculating the distance to an object by the use of two ultrasonic sensors and one radar sensor mounted in the rear bumper. The ultrasonic field is emitted in a semicircular area around the rear of the vehicle. The parking aid sensors can detect objects approximately 5 m (16.4 ft) when the vehicle is moving and 3 m (9.8 ft) when the vehicle is stationary to the rear of the vehicle, 50 cm (1.6 ft) to the rear side of the vehicle, and 16 cm (6 in) above ground. A 750 Hz variable warning tone is generated from a parking aid speaker attached to the parking aid module. The parking aid speaker increases its warning tone rate as the vehicle gets closer to an obstacle. When an object is detected within 45 cm (18 inches) of the sensors, the warning tone becomes continuous.

The parking aid system is enabled when the vehicle ignition is in RUN and reverse (R) gear is selected. The system can be disabled by pressing the menu button on the message center. The parking aid system will indicate it is disabled by illuminating the park assist off located in the message center. The system will always enable when the ignition is transitioned to RUN, or upon entry into REVERSE (R) gear is selected.

The parking aid system will be disabled if any DTC is active. This will be indicated by the parking assist off in the message center. The parking aid module is on the UART based protocol (UBP) communication network and can be diagnosed with a diagnostic tool.

The parking aid system detects objects behind the vehicle when the vehicle is in reverse gear. The parking aid module does this by calculating the distance to an object by the use of four ultrasonic sensors mounted in the rear bumper. The ultrasonic field is emitted in a semicircular area around the rear of the vehicle. The parking aid sensors can detect objects approximately 1.8 m (5.9 ft) to the rear of the vehicle, 50 cm (1.6 ft) to the rear side of the vehicle, and 16 cm (6 in) above ground. A 750 Hz variable warning tone is generated from a parking aid speaker attached to the parking aid module. The parking aid speaker increases its warning tone rate as the vehicle gets closer to an obstacle. When an object is detected within 25 cm (10 in) of the sensors, the warning tone becomes continuous.

The parking aid system is enabled when the ignition is in RUN and the transmission is in REVERSE. The system can be disabled through the message center RESET switch located in the instrument cluster. The parking aid menu is displayed until the transmission is taken out of REVERSE. While the menu is displayed, pressing the message center RESET switch will change the parking aid system status to OFF.

The parking aid system will be disabled if a fault is detected in one of the four sensors, the parking aid speaker or the parking aid module. This will be indicated by the parking aid disabled warning CHECK BACKUP AID displayed in the message center. The parking aid module is on the International Standards Organization (ISO) 9141 network and can be diagnosed with a diagnostic tool.

Scheme 28

1. Verify the customer concern.
2. Visually inspect for obvious signs of mechanical and electrical damage.
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the cause is not visually evident, connect the diagnostic tool to the data link connector and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle: Check that the program card is correctly installed. Check the connections to the vehicle. Check the ignition switch position.
5. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
6. Carry out the data link diagnostics test. If the diagnostic tool responds with: SCP, UBP or ISO circuit fault; all electronic control units no response/not equipped, refer to «MODULE COMMUNICATIONS NETWORK»(ref-209944) . No response/not equipped for parking aid module, go to Go To «PINPOINT TEST A: NO COMMUNICATION WITH THE PARKING AID MODULE (NAVIGATOR)»(ref-209934-S12124473122005121200000) for Navigator or Go To «PINPOINT TEST C: PARKING AID DOES NOT OPERATE CORRECTLY-AUDIO MUTE FEATURE IS INOPERATIVE»(ref-209934-S41971757112005121200000) for Expedition. System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out the self-test diagnostics for the Parking Aid Module.
7. If the DTCs retrieved are related to the concern, go to the «PARKING AID MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX»(ref-209934-S42385332262005121200000) .
8. If no DTCs related to the concern are retrieved, GO to «SYMPTOM CHART»(ref-209934-S35627452652005121200000) .
9. If the DTCs are retrieved that are not found in the «PARKING AID MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX»(ref-209934-S42385332262005121200000) , refer to the master Diagnostic Trouble Code Index in «MULTIFUNCTION ELECTRONIC MODULE»(ref-209949) . PARK AID CALIBRATION AND SELF-TEST DIAGNOSTICS - NAVIGATOR
10. Connect the diagnostic tool.
11. Place the vehicle in PARK.
12. Select the appropriate vehicle and engine.
13. Enter the active command mode for the parking aid module.
14. RUN the radar sensor calibration active command.
15. Exit the active command mode.
16. RUN the park aid on-demand self-test.
17. RETRIEVE and CLEAR any DTCs. REFER to «PARKING AID MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX»(ref-209934-S42385332262005121200000) .
18. RUN the park aid on-demand self-test.
19. If any DTCs remain, Go To «PINPOINT TEST B: PARKING AID IS INOPERATIVE (NAVIGATOR)»(ref-209934-S29383278892005121200000) .