Pinpoint Test A: No Communication With The Instrument Cluster

WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, and 2005 Ford E450 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

A1 CHECK THE INSTRUMENT CLUSTER VOLTAGE SUPPLY

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

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

INSTRUMENT CLUSTER CONNECTOR-PIN & CIRCUIT REFERENCE

Instrument Cluster Connector-Pin	Circuit
C220a-5	1044 (WH/YE)
C220b-1	729 (RD/WH)
C220b-2	295 (LB/PK)

Are the voltages greater than 10 volts?

Yes : GO to A2.
No : REPAIR the circuit in question. TEST the system for normal operation.

A2 CHECK THE INSTRUMENT CLUSTER GROUND CIRCUITS 938 (BK/LG) AND 57 (BK)
- Key in OFF position.
- Measure the resistance between the instrument cluster C220a-10, circuit 57 (BK), harness side and ground; and between the instrument cluster C220b-14, circuit 938 (BK/LG), harness side and ground.
- 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. TEST the system for normal operation.