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

WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. 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?
- Yes : If DTC C1742, GO to F2.
  If DTC C1743, GO to F7.
  
  All others DTCs, REFER to the PARKING AID MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
- No : GO to PINPOINT TEST B .
F2 CHECK CIRCUIT 1437 (BK/PK) FOR A SHORT TO GROUND
- Disconnect: Parking Aid Module C3267.
- Measure the resistance between the parking aid module C3267-2, 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?
- Yes : GO to F4.
- 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 C3268.
- Measure the resistance between the parking aid module C3267-2, circuit 1437 (BK/PK), harness side and ground.
  
  Fig 2: Check Circuit 1437 (BK/PK) For Short Ground With Parking Aid Speaker Disconnected
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes : REPAIR circuit 1438 (DG). CLEAR the DTCs. REPEAT the self-test.
- 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 C3268.
- Measure the resistance between the parking aid module C3267-2, circuit 1437 (BK/PK), harness side and the parking aid speaker C3268-2, 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?
- Yes : GO to F5.
- 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 C3267-6, circuit 1438 (DG), harness side and the parking aid speaker C3268-1, 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?
- Yes : GO to F6.
- 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 C3267-2, circuit 1437 (BK/PK), harness side and ground; and between the parking aid module C3267-6, circuit 1438 (DG), harness side and ground.
  
  Fig 5: Checking Parking Aid Speaker Circuitry
  Courtesy of FORD MOTOR CO.
- Is any voltage present?
- Yes : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
- 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?
- Yes : INSTALL a new parking aid module. REFER to PARKING AID MODULE . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
- 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.