Pinpoint Test R: No Universal Asynchronous Receiver-Transmitter (UART) - Based Protocol (UBP) Network Communication

WARNING: This page is about a different car, the 2004 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

Test Step

R1 CHECK THE DATA LINK CONNECTOR (DLC) C2122 FOR DAMAGE

Key in OFF position.
Inspect the C251 for damage.
Is the C251 OK?

Result / Action to Take

Yes

GO to R2.

REPAIR the C251. CARRY OUT the diagnostic tool data link test.

Test Step

R2 CHECK THE PARKING AID MODULE C4014b FOR DAMAGE

Key in OFF position.
Disconnect: Parking Aid Module C4014b.
Inspect the parking aid module C4014b for damage.
Is the parking aid module C4014b OK?

Result / Action to Take

Yes

GO to R3.

REPAIR the parking aid module C4014b. CARRY OUT the diagnostic tool data link test.

Test Step

R3 CHECK CIRCUIT 693 (OG) BETWEEN THE C251 AND THE PARKING AID MODULE C4014b FOR AN OPEN

Measure the resistance between the parking aid module C4014b pin 1, circuit 693 (OG), harness side and the C251 pin 3, circuit 693 (OG), harness side.

Fig 1: Checking Circuit 693 (OG) Between DLC C251 And Parking Aid Module C4014b For An Open
Courtesy of FORD MOTOR CO.
Is the resistance less than 5 ohms?

Result / Action to Take

Yes

GO to R4.

REPAIR the circuit in question. CARRY OUT the diagnostic tool data link test.

Test Step

R4 CHECK UBP NETWORK WITH THE PARKING AID MODULE DISCONNECTED

Key in ON position.
Carry out the diagnostic tool data link test.
Did the diagnostic tool indicate system passed?

Result / Action to Take

Yes

GO to R5.

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

Test Step

R5 CHECK FOR CORRECT PARKING AID MODULE OPERATION

Disconnect all the parking aid module connectors.
Check for:
- corrosion
- pushed-out pins
Connect all the parking aid module connectors and make sure they seat correctly.
Operate the system and verify the concern is still present.
Is the concern still present?

Result / Action to Take

Yes

INSTALL a new parking aid module. REFER to PARKING AID . CARRY OUT the diagnostic tool data link test.

The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.