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Parking Aid System: Overview Mercury Sable V

Collision/avoidance ~1266 words

Principles of Operation

Note. The liftgate must be closed for correct operation of the parking aid system.

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

The parking aid system detects objects behind the vehicle when the vehicle is in REVERSE (R) gear. The parking aid module (PAM) does this by calculating the distance to an object by the use of 4 ultrasonic sensors mounted in the rear bumper. The PAM does this by calculating the distance to an object within the 170 degree semicircular azimuth area around the rear of the vehicle.

The sensors can detect objects approximately 1.8 m (5.9 ft) to the rear of the vehicle and 50 cm (1.6 ft) to the rear side of the vehicle, and 16 cm (6 in) above the ground. A 750 kHz variable warning tone is generated from a speaker attached to the PAM. The 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 when the vehicle is put into REVERSE (R) gear. The parking aid disabled indicator illuminates for 3 seconds when the ignition switch is turned to RUN. The system can be disabled by pressing the parking aid switch on the instrument panel. The parking aid system indicates it is disabled by illuminating the parking aid disabled indicator (in the parking aid switch). The system is always enabled when the ignition switch is turned to the RUN position, and when the vehicle is put into REVERSE (R) gear.

The parking aid system is disabled if a fault is detected in any of the 4 sensors, the parking aid speaker or the PAM. This is indicated by the parking aid disabled indicator being illuminated when the vehicle is put into REVERSE (R) gear. The PAM is on the International Standards Organization (ISO) 9141 network and can be diagnosed with a scan tool.

Normal Operation

The parking aid system is enabled when the ignition switch is in the RUN position and REVERSE (R) gear is selected. The parking aid module (PAM) supplies voltage to the parking aid sensors 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 VMP10 (WH/BU), VMP11 (BU/GN), VMP12 (BU/GY) and VMP13 (BU/OG). The system is disabled when the PAM receives a ground input on circuit CMP18 (GN/BN). The parking aid switch is grounded by circuit GD111(BK/BU). A 750 Hz variable warning tone is generated from a parking aid speaker which increases the warning tone rate as the vehicle gets closer to an obstacle.

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. Parking aid sensor alignment
  3. PAM
  4. Parking aid disable switch
  5. Rear bumper cover

The parking aid module (PAM) supplies reference voltage to the parking aid sensors 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 VMP10 (WH/BU), VMP11 (BU/GN), VMP12 (BU/GY) and VMP13 (BU/OG).

DTC DescriptionFault Trigger Conditions
C1700 - Left Rear Sensor Circuit Failure or BlockageSets when the PAM senses an open on circuit LMP07 (BU/WH), circuit RMP07 (GN/WH) or circuit VMP11 (BU/GN), or a short to ground on circuit VMP11 (BU/GN).
C1703 - Right Rear Sensor Circuit Failure or BlockageSets when the PAM senses an open on circuit LMP07 (BU/WH), circuit RMP07 (GN/WH) or circuit VMP13 (BU/OG), or a short to ground on circuit VMP13 (BU/OG).
C1706 - Left Rear Center Sensor Circuit FailureSets when the PAM senses an open on circuit LMP07 (BU/WH), circuit RMP07 (GN/WH) or circuit VMP10 (WH/BU), or a short to ground on circuit VMP10 (WH/BU).
C1709 - Right Rear Center Sensor Circuit FailureSets when the PAM senses an open on circuit LMP07 (BU/WH), circuit RMP07 (GN/WH) or circuit VMP12 (BU/GY), or a short to ground on circuit VMP12 (BU/GY).

This pinpoint test is intended to diagnose the following

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

The parking aid module (PAM) supplies reference voltage to the parking aid sensors 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 VMP10 (WH/BU), VMP11 (BU/GN), VMP12 (BU/GY) and VMP13 (BU/OG).

DTC DescriptionFault Trigger Conditions
C1699 - Left Rear Sensor Circuit Short to VbatSets when the PAM senses a short to voltage on circuit VMP11 (BU/GN).
C1702 - Right Rear Sensor Circuit Short to VbatSets when the PAM senses a short to voltage on circuit VMP13 (BU/OG).
C1705 - Left Rear Center Sensor Circuit Short to VbatSets when the PAM senses a short to voltage on circuit VMP10 (WH/BU).
C1708 - Right Rear Center Sensor Circuit Short to VbatSets when the PAM senses a short to voltage on circuit VMP12 (BU/GY).

This pinpoint test is intended to diagnose the following

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

The parking aid system is enabled when the ignition switch is in the RUN position and 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. 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.

If no objects are present, the parking aid distance PIDs should read 255 cm (100 in).

DTC DescriptionFault Trigger Conditions
C1701 - Left Rear Sensor Circuit FaultSets when the PAM senses an internal sensor fault or the wrong sensor attenuation time on the left rear outer sensor.
C1704 - Right Rear Sensor Circuit FaultSets when the PAM senses an internal sensor fault or the wrong sensor attenuation time on the right rear outer sensor.
C1707 - Left Rear Center Sensor Circuit FaultSets when the PAM senses an internal sensor fault or the wrong sensor attenuation time on the left rear inner sensor.
C1710 - Right Rear Center Sensor Circuit FaultSets when the PAM senses an internal sensor fault or the wrong sensor attenuation time on the right rear inner sensor.

This pinpoint test is intended to diagnose the following

  1. Parking aid sensor
  2. 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

The system can be disabled by the parking aid switch. 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.

  1. DTC C1742 (Rear Sounder Circuit Failure) - sets when the parking aid module (PAM) senses an open or short to ground on circuit CMP09 (BN/BU) or RMP09 (BU/GN).
  2. DTC C1743 (Rear Sounder Circuit Short to Vbatt) - sets when the PAM senses a short to voltage on circuit RMP09 (BU/GN).

This pinpoint test is intended to diagnose the following

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

The parking aid system is enabled when the vehicle ignition is in RUN and REVERSE (R) is selected. When the parking aid switch is pressed the parking aid module (PAM) circuit CMP18 (GN/BN) is momentarily grounded, which disables the parking aid system.

  1. DTC C1748 (Switch Input Circuit Short to Gnd) - sets when the PAM senses a short to ground or open on circuit CMP18 (GN/BN). This DTC sets in continuous memory only.

This pinpoint test is intended to diagnose the following

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

The parking aid system is enabled when the ignition switch is in the RUN position and the transmission is in REVERSE (R). The system can be disabled by the parking aid switch. The parking aid module (PAM) sends a signal to the LED over circuit CMP02 (GN/BU) when the switch is pressed. The switch and LED are grounded through circuit GD111 (BK/BU).

  1. DTC B2373 (LED Circuit Short to Battery) - sets when the PAM senses a short to voltage on circuit CMP02 (GN/BU).
  2. DTC C1920 (LED Circuit Failure) - sets when the PAM senses an open or short to ground on circuit CMP02 (GN/BU).

This pinpoint test is intended to diagnose the following

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

The parking aid system is enabled when the ignition switch in the RUN position and when the vehicle is put into REVERSE (R). When the parking aid system is enabled, the audio system volume is cutback, allowing the 750 Hz variable warning tone is generated from a parking aid speaker to be clearly heard.

  1. DTC B1065 (Radio Volume Cutback Circuit Short to Battery) - sets when the parking aid module (PAM) senses a short to voltage on circuit CME05 (GN/BU).
  2. DTC B1066 (Radio Volume Cutback Circuit Failure) - sets when the PAM senses an open or short to ground on circuit CME05 (GN/BU).

This pinpoint test is intended to diagnose the following

  1. Wiring, terminals or connectors
  2. PAM

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