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Pinpoint Test G: DTC C1748 - Switch Input Circuit Short To Ground

WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. G1 CHECK FOR RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND PAM SELF-TESTS 
    • Check for recorded PAM DTCs from the continuous and on-demand self-tests.
    • Are any PAM DTCs recorded? 
    1. YES  : For DTC C1748 and/or B1010, go to  G2 .
    2. NO  : For all other DTCs, REFER to DTC Charts .
  2. G2 CHECK CIRCUIT CMP18 (GN/BN) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: PAM C4014
    • Measure the resistance between the PAM C4014-11, circuit CMP18 (GN/BN), harness side and ground.
      • Fig 1: Measuring Resistance
      G03902671Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  G4.
    2. NO  : Go to  G3.
  3. G3 CHECK CIRCUIT CMP18 (GN/BN) FOR A SHORT TO GROUND - PARKING AID DISABLE SWITCH DISCONNECTED 
    • Disconnect: Parking Aid Disable Switch C2114
    • Measure the resistance between the parking aid disable switch C2114-5, circuit CMP18 (GN/BN), harness side and ground.
      • Fig 2: Measuring Resistance
      GF0042660Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : INSTALL a new parking aid disable switch. REFER to Parking Aid Switch . CLEAR the DTCs. REPEAT the self-test.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  4. G4 CHECK CIRCUIT CMP18 (GN/BN) FOR A SHORT TO POWER 
    • Key in OFF position.
    • Disconnect: PAM C4014
    • Key in ON position.
    • Measure the voltage between the PAM C4014-11, circuit CMP18 (GN/BN), harness side and ground.
      • Fig 3: Checking Circuit For Short To Voltage
      GF0018174Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. YES  : Go to  G5.
    2. NO  : Go to  G6.
  5. G5 CHECK CIRCUIT CMP18 (GN/BN) FOR A SHORT TO POWER - PARKING AID DISABLE SWITCH DISCONNECTED 
    • Disconnect: Parking Aid Disable Switch C2114
    • Measure the voltage between the PAM C4014-11, circuit CMP18 (GN/BN), harness side and ground.
      • Fig 4: Checking Circuit For Short To Voltage
      GF0018174Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. YES  : INSTALL a new parking aid disable switch. REFER to Parking Aid Switch . CLEAR the DTCs. REPEAT the self-test.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  6. G6 CHECK CIRCUIT GD114 (BK/BU) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Parking Aid Disable Switch C2114
    • Measure the resistance between the parking aid disable switch C2114-1, circuit GD114 (BK/BU), harness side and ground.
      • Fig 5: Measuring Resistance
      GF0016128Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  G7.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  7. G7 CHECK THE PARKING AID SWITCH 
    • Install a known good parking aid disable switch.
    • Test the system for normal operation.
    • Is the concern still present? 
    1. YES  : Go to  G8.
    2. NO  : INSTALL a new parking aid switch. REFER to Parking Aid Switch . CLEAR the DTCs. REPEAT the self-test.
  8. G8 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 verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new PAM. REFER to Parking Aid Module . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the scan tool data link test.
    2. 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.
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