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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1616 (Parking Aid System) >> Diagnostic Tests >> Parking Aid >> Pinpoint Tests >> Pinpoint Test A: Parking Aid Is Inoperative

Pinpoint Test A: Parking Aid Is Inoperative

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Parking Aid for schematic and connector information.

Normal Operation 

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. Reverse status is communicated to the parking aid module (PAM) from the digital transmission range (TR) sensor on circuit 140 (BK/PK). Vehicle speed status is communicated to the PAM from the PCM on circuit 679 (GY/BK).

The parking aid system is disabled if any fault is detected. This will be indicated by the message center indicating PARK AID OFF.

This pinpoint test is intended to diagnose the following:

PINPOINT TEST A: THE PARKING AID IS INOPERATIVE 

CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Diagnostic measurements are made at the parking aid system inline harness connector located in the luggage compartment, forward of the LH tail light assembly.
  1. A1 CHECK THE MESSAGE CENTER DISPLAY 
    • Key in ON position.
    • Observe the message center.
    • Does the message center display PARK AID OFF? 
    1. YES  : Go to  A4.
    2. NO  : Go to  A2.
  2. A2 CHECK THE REVERSING LAMPS OPERATION 
    • Apply the parking brake.
    • Key in ON position.
    • Select REVERSE.
    • Check the reversing lamps operation.
    • Do the reversing lamps operate correctly? 
    1. YES  : Go to  A3.
    2. NO  : REFER to EXTERIOR LIGHTING article.
  3. A3 CHECK CIRCUIT 140 (BK/PK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Parking Aid System Inline Harness C406
    • Key in ON position.
    • Apply the parking brake.
    • Select REVERSE.
      • Fig 1: Checking Circuit
      GF0018975Courtesy of FORD MOTOR CO.
    • Measure the voltage between the parking aid system inline harness C406-6, circuit 140 (BK/PK), body harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  A6.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. A4 CHECK CIRCUIT 1435 (DG/VT) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: Parking Aid System Inline Harness C406
    • Disconnect: Instrument Cluster (IC)C220
    • Key in ON position.
      • Fig 2: Checking Circuit For Short To Voltage
      GF0018976Courtesy of FORD MOTOR CO.
    • Measure the voltage between the parking aid system inline harness C406-2, circuit 1435 (DG/VT), body harness side and ground.
    • Is there any voltage indicated? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : Go to  A5.
  5. A5 CHECK CIRCUIT 1436 (VT/OG) FOR AN OPEN OR SHORT TO GROUND 
    • Key in OFF position.
      • Fig 3: Checking Circuit For An Open Or Short To Ground
      GF0018977Courtesy of FORD MOTOR CO.
    • Measure the resistance between the IC C220-24, circuit 1436 (VT/OG), harness side and the parking aid system inline harness C406-8, circuit 1436 (VT/OG), body harness side; and between the IC C220-24, circuit 1436 (VT/OG), harness side and ground.
    • Is the resistance less than 5 ohms between the IC and the parking aid system inline harness and greater than 10,000 ohms between the IC and ground? 
    1. YES  : INSTALL a new IC. REFER to INSTRUMENTATION, MESSAGE CENTER, & WARNING CHIMES article.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  6. A6 CHECK CIRCUIT 1437 (BK/PK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: High Mounted Stoplamp C904
    • Key in ON position.
    • Apply the parking brake.
    • Select REVERSE.
      • NOTE: The object used in this system check can be fabricated from 9 cm O.D. (3 in I.D.) plastic pipe 100 cm (39 in) in length (available as PVC pipe, or similar from a hardware or plumbing supply).
    • Place a suitable object (9 cm O.D. [76.2 mm (3 in) I.D.] in diameter by 100 cm [39 in] in length) 5.08 cm (2 in) from the center of the rear bumper.
      • Fig 4: Checking Circuit For An Open
      GF0018978Courtesy of FORD MOTOR CO.
    • Measure the voltage between the high mounted stoplamp C904-4, circuit 1437 (BK/PK), body harness side and ground.
    • Is the voltage approximately 6 volts? 
    1. YES  : Go to  A7.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  7. A7 CHECK CIRCUIT 676 (PK/OG) FOR AN OPEN 
    • Key in OFF position.
      • Fig 5: Checking Circuit For An Open
      GF0018979Courtesy of FORD MOTOR CO.
    • Measure the resistance between the high mounted stoplamp C904-5, circuit 676 (PK/OG), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A8.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  8. A8 CHECK THE PARKING AID SYSTEM INLINE HARNESS 
    • Inspect the parking aid system inline harness for an open, short to voltage, or a short to ground.
    • Is the parking aid system inline harness OK? 
    1. YES  : Go to  A9.
    2. NO  : INSTALL a new or REPAIR the parking aid system inline harness. TEST the system for normal operation.
  9. A9 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? 
    1. YES  : INSTALL a new PAM. REFER to Parking Aid Module (PAM) . TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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