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

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. 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.

G1 CHECK THE DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND PARKING AID MODULE SELF-TESTS
- Check the parking aid module DTCs from the continuous and on-demand self-tests.
- Are any DTCs recorded?
1. YES : For DTC C1748, go to G2 .
  For all other DTCs, REFER to the Parking Aid Module Diagnostic Trouble Code (DTC) Index in this article.
2. NO : Go to Pinpoint Test B .
G2 CHECK THE PARKING AID SWITCH OPERATION
- Key in OFF position.
- Disconnect: Parking Aid Module C2023
- While pressing and releasing the parking aid switch, measure the resistance between the parking aid module C2023-11, circuit 1435 (DG/VT), harness side and ground.
- 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 G4.
2. NO : Go to G3.
G3 CHECK CIRCUIT 1435 (DG/VT) FOR A SHORT TO GROUND
- Disconnect: Parking Aid Switch C2035
- Measure the resistance between the parking aid module C2023-11, circuit 1435 (DG/VT), harness side and ground.
- 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.
G4 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. 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.