Pinpoint Test A: No Communication With The Instrument Cluster

A1 CHECK THE INSTRUMENT CLUSTER POWER SUPPLY

Key in OFF position.
Disconnect: Instrument Cluster.
Key in ON position.
Measure the voltage between the instrument cluster, harness side and ground as follows:

PIN SPECIFICATION

Instrument Cluster Connector	Pin	Circuit
C220a	5	1002 (BK/PK)
C220a	1	3049 (BK/LG)
C220a	14	3049 (BK/LG)
C220a	7	640 (RD/YE)

Are the voltages greater than 10 volts?

Yes : GO to A2.
No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

A2 CHECK INSTRUMENT CLUSTER GROUND CIRCUITS 57 (BK) AND 676 (PK/OG)

Key in OFF position.
Measure the resistance between the instrument cluster, harness side and ground as follows:

PIN SPECIFICATION

Instrument Cluster Connector	Pin	Circuit
C220a	9 (Expedition/Navigator)	676 (PK/OG)
C220a	22 (Expedition/Navigator)	676 (PK/OG)
C220a	10 (Expedition)	57 (BK)

Are the resistances less than 5 ohms?

Yes : REFER to MODULE COMMUNICATIONS NETWORK to continue diagnosis of the communication network.
No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.