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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 860 (Parking Aid System -- F250-F550 Super Duty) >> Diagnostic Tests >> Parking Aid >> Pinpoint Tests >> Pinpoint Test F: DTC C1748 - Switch Input Circuit Short to Gnd >> Pinpoint Test F: DTC C1748 - Switch Input Circuit Short To GND

Pinpoint Test F: DTC C1748 - Switch Input Circuit Short To GND

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
  1. F1 CHECK FOR RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND PARKING AID MODULE SELF-TESTS 
    • Check for recorded parking aid module DTCs from the continuous and on-demand self-tests.
    • Are any DTCs recorded? 
    1. YES  : For DTC C1748, go to  F2 .

      For all other DTCs, REFER to the PARKING AID MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX .

    2. NO  : Go to Pinpoint Test A .
  2. F2 CHECK CIRCUIT 1435 (DG/VT) FOR A SHORT TO GROUND. 
    • Key in OFF position.
    • Disconnect: Parking Aid Module C4014
    • Measure the resistance between the parking aid module C4014-7, circuit 1435 (DG/VT), harness side and ground.
      Fig 1: Checking Circuit 1435 (DG/VT) For Short To Ground
      GF0008227Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms with the switch pressed and greater than 10,000 ohms with the switch released? 
    1. YES  : Go to  F4.
    2. NO  : Go to  F3.
  3. F3 CHECK CIRCUIT 1435 (DG/VT) FOR A SHORT TO GROUND-PARKING AID DISABLE SWITCH DISCONNECTED 
    • Disconnect: Parking Aid Disable Switch C2035
    • Measure the resistance between the parking aid module C4014-7, circuit 1435 (DG/VT), harness side and ground.
      Fig 2: Checking Circuit 1435 (DG/VT) For Short To Ground-Parking Aid Disable Switch Disconnected
      GF0008227Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : INSTALL a new parking aid switch. REFER to Parking Aid Switch  in this article. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  4. F4 CHECK FOR CORRECT PARKING AID MODULE OPERATION 
    • Disconnect the parking aid module connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the parking aid module 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 parking aid module. REFER to Parking Aid Module  in this article. 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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