Pinpoint Test U: No Communication With The Instrument Cluster

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

U1 CHECK THE INSTRUMENT CLUSTER VOLTAGE SUPPLY

Key in OFF position.
Disconnect: Instrument Cluster C220a, C220b.
Key in ON position.

Measure the voltage between the instrument cluster, harness side and ground as follows:

INSTRUMENT CLUSTER CONNECTOR-PIN SPECIFICATION

Instrument Cluster Connector-Pin	Circuit
C220a-13	640 (RD/YE)
C220b-19	3049 (BK/LG)
C220a-22	1002 (BK/PK)

Are the voltages greater than 10 volts?

Yes : GO to U2.
No ; REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

U2 CHECK CIRCUITS 57 (BK) AND 676 (PK/OG) FOR AN OPEN

Key in OFF position.

Measure the resistance between the instrument cluster, harness side and ground as follows:

INSTRUMENT CLUSTER CONNECTOR-PIN SPECIFICATION

Instrument Cluster Connector-Pin	Circuit
C220a-10	57 (BK)
C220b-12	676 (PK/OG)

Are the resistances less than 5 ohms?

Yes : GO to U3.
No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

U3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect all the instrument cluster connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the instrument cluster connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.
- No : 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.