Pinpoint Test F: DTC C1742 And C1743 Rear Sounder Circuit Failure/Short To Battery

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

F1 RETRIEVE THE RECORDED DTCS FROM BOTH THE CONTINUOUS AND ON-DEMAND SELF-TESTS
- Retrieve the recorded parking aid module DTCs from the continuous and on-demand self-tests.
- Are any DTCs recorded?
1. Yes : If DTC C1742, GO to F2.
  If DTC C1743, GO to F6.
  
  All others DTCs, REFER to the PARKING AID MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
2. No : GO to PINPOINT TEST B .
F2 CHECK CIRCUIT 1437 (BK/PK) FOR A SHORT TO GROUND
- Disconnect: Parking Aid Module C4014.
- Measure the resistance between the parking aid module C4014 pin 14, circuit 1437 (BK/PK), harness side and ground.
  
  Fig 1: Checking Circuit 1437 (BK/PK) For Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
1. Yes : GO to F4.
2. No : GO to F3.
F3 CHECK CIRCUIT 1437 (BK/PK) FOR A SHORT TO GROUND WITH THE PARKING AID SPEAKER DISCONNECTED
- Disconnect: Parking Aid Speaker C4015.
- Measure the resistance between the parking aid module C4014 pin 14, circuit 1437 (BK/PK), harness side and ground.
  
  Fig 2: Checking Circuit 1437 (BK/PK) For Short To Ground With Parking Aid Speaker Disconnected
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
1. Yes : REPAIR circuit 1438 (DG). CLEAR the DTCs. REPEAT the self-test.
2. No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
F4 CHECK CIRCUIT 1437 (BK/PK) FOR AN OPEN
- Key in OFF position.
- Disconnect: Parking Aid Speaker C4015.
- Measure the resistance between the parking aid module C4014 pin 14, circuit 1437 (BK/PK), harness side and the parking aid speaker C4015 pin 2, circuit 1437 (BK/PK), harness side.
  
  Fig 3: Checking Circuit 1437 (BK/PK) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
1. Yes : GO to F5.
2. No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
F5 CHECK CIRCUIT 1438 (DG) FOR AN OPEN
- Measure the resistance between the parking aid module C4014 pin 17, circuit 1438 (DG), harness side and the parking aid speaker C4015 pin 1, circuit 1438 (DG), harness side.
  
  Fig 4: Checking Circuit 1438 (DG) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
1. Yes : GO to F6.
2. No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
F6 CHECK THE PARKING AID SPEAKER CIRCUITRY FOR SHORTS TO VOLTAGE
- Key in ON position.
- Measure the voltage between the parking aid module C4014 pin 14, circuit 1437 (BK/PK), harness side and ground; and between the parking aid module C4014 pin 17, circuit 1438 (DG), harness side and ground.
  
  Fig 5: Checking Parking Aid Speaker Circuitry For Shorts To Voltage
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
1. Yes : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
2. No : GO to F7.
F7 CHECK FOR CORRECT PARKING AID MODULE OPERATION
- Disconnect the parking aid module connector.
- Check for:
  - corrosion
  - 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 . REPEAT the self-test. CARRY OUT the diagnostic 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.