Parking Aid: Overview Ford Fusion I facelift

Principles of Operation

Note. The smart junction box (SJB) is also known as the generic electronic module (GEM).

The parking aid sensors detect objects approximately 1.6 m (5.3 ft) from the rear of the vehicle, 50 cm (1.6 ft) from the rear side of the vehicle, and 16 cm (6 in) above the ground. The parking aid module (PAM) calculates the distance to an object within the 170 degree semicircular azimuth area around the rear of the vehicle. A variable warning tone is generated from a parking aid speaker attached to the PAM. 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 switch is in the RUN position and the REVERSE (R) gear is selected. The parking aid system is disabled if a fault is detected in 1 of the 4 sensors, the parking aid speaker, or the PAM. This is indicated by the parking aid disabled warning in the message center.

The PAM is on the medium speed controller area network (MS-CAN) and can be diagnosed with a scan tool. The PAM communicates with the scan tool, the SJB, the audio control module (ACM) and the instrument cluster (IC). The following chart describes network messages used by the parking aid module

Note. Both the medium speed controller area network (MS-CAN) and the high speed controller area network (HS-CAN) are used for intermodule communication. A gateway message is transferred from one network to another network through the instrument cluster (IC). Refer to MODULE COMMUNICATIONS NETWORK article for network communication information.

PARKING AID MODULE (PAM) NETWORK COMMUNICATION MESSAGES

Normal Operation

The parking aid system is enabled when the ignition switch is in the RUN position and the REVERSE (R) gear is selected. The parking aid module (PAM) receives reverse gear input from the instrument cluster (IC) through the medium speed controller area network (MS-CAN). Voltage is supplied to the parking aid sensors from the PAM on circuit LMP07 (BU/WH). The PAM supplies ground to the parking aid sensors on circuit RMP07 (GN/WH). The parking aid module (PAM) receives a signal from the parking aid sensors on circuits VMP14 (WH/OG), VMP15 (YE/GN), VMP16 (YE/GY) and VMP17 (YE/OG). The system can be disabled through the message center which is part of the IC.

This pinpoint test is intended to diagnose the following

1. Rear bumper cover
2. Parking aid sensors alignment
3. PAM

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

1. A1 CHECK THE DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND PAM SELF-TESTS Check the PAM DTCs from the continuous and on-demand self-tests. Are any PAM DTCs recorded? YES : REFER to «DTC Charts»(ref-291945-S16311422492008073000000) . NO : Go to A2 .
2. A2 CHECK THE PARKING AID SENSORS FOR CORRECT ALIGNMENT NOTE: If the vehicle was in a rear end collision, the parking aid sensors may not be aligned correctly. Check the bumper for correct alignment. Carry out the azimuth system check. Refer to «Azimuth System Check»(ref-291945-S15552061612008073000000) . Carry out the elevation system check. Refer to «Elevation System Check»(ref-291945-S37174867772008073000000) . Does the parking aid system pass both system checks? YES : Go to A3 . NO : REALIGN or INSTALL a new bumper cover. REFER to «BUMPERS»(ref-291877) article. If the vehicle was in a rear end collision, further body work may be required to bring the parking aid sensors into correct alignment.
3. A3 CHECK FOR CORRECT REVERSE GEAR INPUT Apply the parking brake. Key in ON position. Select REVERSE. Enter the following diagnostic mode on the diagnostic tool: PAM DataLogger Monitor the PAM TRANSGR PID. Does the PID indicate YES (transmission in reverse)? YES : Go to A4 . NO : INSTALL a new PAM. REFER to «Parking Aid Module (PAM)»(ref-291945-S41274726212008073000000) . TEST the system for normal operation.
4. A4 CHECK THE MESSAGE CENTER FOR PARKING AID DISABLE OPERATION While observing the instrument cluster (IC) message center, disable and enable the parking aid system. Does the message center display PARK AID OFF when the parking aid system is disabled, and display PARK AID ON when the parking aid system is enabled? YES : Go to A5 . NO : REFER to «INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES»(ref-291880) article.
5. A5 CHECK FOR CORRECT PAM OPERATION Disconnect the PAM connector. Check for: corrosion damaged pins pushed-out pins Connect the PAM connector and make sure it seats correctly. Operate the system and determine if the concern is still present. Is the concern still present? YES : INSTALL a new PAM. REFER to «Parking Aid Module (PAM)»(ref-291945-S41274726212008073000000) . TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Refer to SYSTEM WIRING DIAGRAMS article for Fusion, SYSTEM WIRING DIAGRAMS article for Milan or SYSTEM WIRING DIAGRAMS article for MKZ, Parking Aid for schematic and connector information.

Voltage is supplied to the parking aid sensors from the parking aid module (PAM) on circuit LMP07 (BU/WH). The PAM supplies ground to the parking aid sensors on circuit RMP07 (GN/WH). The PAM receives a signal from the parking aid sensors on circuits VMP14 (WH/OG), VMP15 (YE/GN), VMP16 (YE/GY) and VMP17 (YE/OG).

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Parking aid sensor(s)
3. Parking aid bumper harness
4. PAM

Note. Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

1. B1 RETRIEVE THE DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND PAM SELF-TESTS Check the PAM DTCs from the continuous and on-demand self-tests. Are multiple DTCs recorded? YES : Go to B2 . NO : For DTCs C1700, C1703, C1706 or C1709, go to B3 . For all other DTCs, REFER to «DTC Charts»(ref-291945-S16311422492008073000000) .
2. B2 CHECK THE BUMPER WIRING HARNESS Inspect the bumper wiring harness for opens, shorts, grounds, or corrosion. Is the bumper wiring harness OK? YES : Go to B3 . NO : REPAIR or INSTALL a new bumper wiring harness. CLEAR the DTCs. REPEAT the self-test.
3. B3 CHECK THE SENSOR CIRCUITRY FOR OPENS Key in OFF position. Disconnect: Suspect Parking Aid Sensor C4009, C4010, C4011 or C4012 Disconnect: PAM C4014 Measure the resistance between the PAM C4014, harness side and the suspect parking aid sensor, harness side as follows: DTC Rear Sensor PAM Connector- Pin Sensor Connector- Pin Circuit C1700 LH outer C4014-9 C4009-1 LMP07 (BU/WH) C1700 LH outer C4014-15 C4009-2 VMP15 (YE/GN) C1700 LH outer C4014-12 C4009-3 RMP07 (GN/WH) C1703 RH outer C4014-9 C4011-1 LMP07 (BU/WH) C1703 RH outer C4014-16 C4011-2 VMP17 (YE/OG) C1703 RH outer C4014-12 C4011-3 RMP07 (GN/WH) C1706 LH inner C4014-9 C4010-1 LMP07 (BU/WH) C1706 LH inner C4014-14 C4010-2 VMP14 (WH/OG) C1706 LH inner C4014-12 C4010-3 RMP07 (GN/WH) C1709 RH inner C4014-9 C4012-1 LMP07 (BU/WH) C1709 RH inner C4014-13 C4012-2 VMP16 (YE/GY) C1709 RH inner C4014-12 C4012-3 RMP07 (GN/WH) Are the resistances less than 5 ohms? YES : Go to B4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
4. B4 CHECK THE SENSOR CIRCUITRY FOR SHORTS TO GROUND Measure the resistance between the suspect parking aid sensor, harness side and ground as follows: DTC Rear Sensor Connector-Pin Circuit C1700 LH outer C4009-2 VMP15 (YE/GN) C1703 RH outer C4011-2 VMP17 (YE/OG) C1706 LH inner C4010-2 VMP14 (WH/OG) C1709 RH inner C4012-2 VMP16 (YE/GY) Is the resistance greater than 10,000 ohms? YES : If all of the parking aid sensors recorded DTCs, go to B5 . If one or more parking aid sensor(s) recorded DTCs, INSTALL a new sensor(s) for the one in question. REFER to «Parking Aid Sensor»(ref-291945-S08188591932008073000000) . CLEAR the DTCs. REPEAT the self-test. NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
5. B5 CHECK FOR CORRECT PAM OPERATION Disconnect the PAM connector. Check for: corrosion damaged pins pushed-out pins Connect the PAM connector and make sure it seats correctly. Operate the system and determine if the concern is still present. Is the concern still present? YES : INSTALL a new PAM. REFER to «Parking Aid Module (PAM)»(ref-291945-S41274726212008073000000) . TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

Voltage is supplied to the parking aid sensors from the parking aid module (PAM) on circuit LMP07 (BU/WH). The PAM supplies ground to the parking aid sensors on circuit RMP07 (GN/WH). The PAM receives a signal from the parking aid sensors on circuits VMP14 (WH/OG), VMP15 (YE/GN), VMP16 (YE/GY) and VMP17 (YE/OG).

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Parking aid sensor(s)
3. Parking aid bumper harness
4. PAM

The parking aid system is enabled when the ignition switch is in the RUN position and the REVERSE (R) gear is selected. The parking aid module (PAM) calculates the distance to an object by the use of 4 ultrasonic sensors mounted in the rear bumper. The parking aid sensors can detect obstructions in the path behind the vehicle.

This pinpoint test is intended to diagnose the following

1. Dirty or obstructed parking aid sensor
2. Parking aid sensor
3. Parking aid bumper harness
4. PAM

Voltage is supplied to the parking aid sensors from the parking aid module (PAM) on circuit LMP07 (BU/WH). The PAM supplies ground to the parking aid sensors on circuit RMP07 (GN/WH).

1. DTC B1299 (Power Supply Sensor Circuit Short to Ground) - sets when the sensor power supply circuit is shorted to ground or to circuit RMP07 (GN/WH).

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. Parking aid sensor(s)
3. Parking aid bumper harness
4. PAM

A 750 Hz variable warning tone is generated from a parking aid speaker. The parking aid speaker increases the warning tone rate as the vehicle gets closer to an obstacle. Circuits CMP09 (BN/BU) and RMP09 (BU/GN) provide the connection between the parking aid module (PAM) and speaker.

1. DTC C1742 (Rear Sounder Circuit Failure) - sets when the sounder circuit is open or shorted to ground.
2. DTC C1743 (Rear Sounder Circuit Short to Vbat) - sets when the sounder circuit is shorted to voltage.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. PAM
3. Parking aid speaker

The parking aid module (PAM) receives the ignition switch state from the smart junction box (SJB) as a network message.

1. DTC U0140 (Lost Communication With Body Control Module [GEM])- is a continuous and on-demand DTC that sets in the parking aid module when ignition switch state messages are not received from the SJB.

This pinpoint test is intended to diagnose the following

1. SJB
2. Networked data fault

The parking aid module (PAM) receives the transmission selector (PRNDL) state from the instrument cluster (IC) as a gateway message from the TCM.

1. DTC U0155 (Lost Communication With IC) - is a continuous and on-demand DTC that sets in the parking aid module (PAM) when PRNDL messages are not received from the IC.

This pinpoint test is intended to diagnose the following

1. IC
2. Networked data fault

With the ignition switch in the RUN position and the gear selector in REVERSE (R), the parking aid system calculates the distance to an object by the use of a radar sensor. A 750 Hz variable warning tone is generated by the parking aid sounder. A volume cutback request message is sent to the audio unit from parking aid module (PAM) over the medium speed controller area network (MS-CAN) to decrease the volume of the audio unit. The sounder increases its warning tone rate as the vehicle gets closer to an obstacle. When an object is detected within 46 cm (18 in) of the vehicle, the warning tone becomes continuous.

This pinpoint test is intended to diagnose the following

1. Wiring, terminals or connectors
2. PAM
3. Audio Unit