Pinpoint Test AX: No Communication With The Parking Aid Module

WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.

AX1 CHECK CIRCUIT 1040 (RD/BK) FOR VOLTAGE
- Key in OFF position.
- Disconnect: Parking Aid Module.
- Key in ON position.
- Measure the voltage between the parking aid module C4014-1 (with front parking aid) or C4226-1 (without front parking aid), circuit 1040 (RD/BK), harness side and ground.
  
  Fig 1: Measuring Voltage Between Parking Aid Module C4014-1 (With Front Parking Aid) Or C4226-1 (Without Front Parking Aid), Circuit 1040 (RD/BK), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes

GO to AX2

No

REPAIR the circuit. TEST the system for normal operation.
AX2 CHECK CIRCUIT 1205 (BK) FOR OPEN
- Measure the resistance between the parking aid module C4014-3 (with front parking aid), or C4226-4 (without front parking aid), circuit 1205 (BK), harness side and ground.
  
  Fig 2: Measuring Resistance Between Parking Aid Module C4014-3 (With Front Parking Aid) Or C4226-4 (Without Front Parking Aid), Circuit 1205 (BK), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes

REFER to MODULE COMMUNICATIONS NETWORK to continue communication diagnostics.

No

REPAIR the circuit.

TEST the system for normal operation.