Pinpoint Test A: The Active Park Assist Switch Does Not Respond When Pressed And The IPC Does Not Display The Active Park Assist Message In The IPC Message Center

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

A1 VERIFY THE CUSTOMERS CONCERN
- Ignition ON.
- Apply the brakes.
- Select DRIVE.
- While pressing the active park assist switch monitor the IPC message center
- Does the IPC message center read "ACTIVE PARK SEARCHING"?
- Yes : The system is operating correctly at this time. PRESS and RELEASE the active park assist switch several times to verify that there is no intermittent condition with the switch. If an intermittent condition occurs, GO to A3.
  Otherwise, the system is operating correctly at this time. TEST the system for normal operation.
- No : GO to A2.
A2 CHECK THE DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND PAM SELF-TESTS
- Check the PAM DTCs from the continuous and on-demand self-tests.
- Are any PAM DTCs recorded?
- Yes : REFER to DTC CHARTS in this service information.
- No : GO to A3.
A3 CHECK THE ACTIVE PARK SWITCH GROUND CIRCUIT FOR AN OPEN
- Disconnect: Active Park Assist Switch C3345.
- Measure the resistance between the active park assist switch C3345-2, circuit GD114 (BK/BU), harness side and ground.
  
  Fig 1: Measuring Resistance Between Active Park Assist Switch C3345-2, Circuit GD114 (BK/BU), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to A4.
- No : REPAIR circuit GD114 (BK/BU). CLEAR the DTCs. TEST the system for normal operation.
A4 CHECK THE ACTIVE PARK SWITCH SIGNAL CIRCUIT FOR AN OPEN
- Disconnect: PAM C4226a.
- Measure the resistance between the PAM C4226a-10, circuit CMP18 (GN/BN), harness side and the active park assist switch C3345-6, circuit CMP18 (GN/BN), harness side.
  
  Fig 2: Checking Active Park Switch Signal Circuit For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to A5.
- No : REPAIR circuit CMP18 (GN/BN). CLEAR the DTCs. TEST the system for normal operation.
A5 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?
- Yes : INSTALL a new PAM. REFER to PARKING AID SYSTEM article. TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.