Pinpoint Test M: The Message Center Module Does Not Respond To The Diagnostic Tool

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

M1 CHECK THE MESSAGE CENTER MODULE C930b FOR DAMAGE

Key in OFF position.
Disconnect: Message Center Module C930b.
Inspect the message center module C930b for damage.
Is the message center module C930b OK?

Result / Action to Take

Yes

GO to M2.

REPAIR the message center module C930b. CARRY OUT the diagnostic tool data link test.

Test Step

M2 CHECK CIRCUITS 914 (TN/OG) AND 915 (PK/LB) BETWEEN THE DLC C251 AND THE MESSAGE CENTER MODULE C930b FOR AN OPEN

Measure the resistance between the message center module C930b pin 1, circuit 914 (TN/OG), harness side and the C251 pin 2, circuit 914 (TN/OG), harness side.

Fig 1: Checking Circuit 914 (TN/OG) Between DLC C251 And Message Center Module C930B For An Open
Courtesy of FORD MOTOR CO.
Measure the resistance between the message center module C930b pin 7, circuit 915 (PK/LB), harness side and the C251 pin 10, circuit 915 (PK/LB), harness side.

Fig 2: Checking Circuit 915 (PK/LB) Between DLC C251 And Message Center Module C930B For An Open
Courtesy of FORD MOTOR CO.
Are the resistances less than 5 ohms?

Result / Action to Take

Yes

GO to M3.

REPAIR the circuit in question between the message center module C930b and the DLC C251. CARRY OUT the diagnostic tool data link test.

Test Step

M3 CHECK FOR CORRECT MESSAGE CENTER MODULE OPERATION

Disconnect all the message center module connectors.
Check for:
- corrosion
- pushed-out pins
Connect all the message center 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 message center module. REFER to INFORMATION AND MESSAGE CENTER . CLEAR the DTCs. 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 selftest.