Pinpoint Test A: No Communication With The Instrument Cluster

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.

A1 CHECK THE INSTRUMENT CLUSTER VOLTAGE SUPPLY

Key in OFF position.
Disconnect: Instrument Cluster C220.
Key in ON position.

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

INSTRUMENT CLUSTER CONNECTOR/PIN REFERENCE CHART

Connector/Pin	Circuit
C220-28	1002 (BK/PK)
C220-21	956 (OG/LG)
C220-29	3049 (BK/LG)

Fig 1: Checking Instrument Cluster Voltage Supply

Courtesy of FORD MOTOR CO.

Are the voltages greater than 10 volts?

Yes : GO to A2.

No : VERIFY the smart junction box (SJB) fuses 7 (10A), 22 (10A), and 28 (10A) are OK. If OK, REPAIR the circuit in question. TEST the system for normal operation.

A2 CHECK THE INSTRUMENT CLUSTER GROUND CIRCUITS 57 (BK) AND 570 (BK/WH) FOR AN OPEN

Key in OFF position.

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

INSTRUMENT CLUSTER CONNECTOR/PIN REFERENCE CHART

Connector/Pin	Circuit
C220-25	57 (BK)
C220-31	570 (BK/WH)

Fig 2: Checking Instrument Cluster Ground Circuits 57 (BK) And 570 (BK/WH) For Open

Courtesy of FORD MOTOR CO.

Are the resistances less than 5 ohms?

Yes : REFER to MODULE COMMUNICATIONS NETWORK to continue communication diagnosis.

No : REPAIR the circuit in question. TEST the system for normal operation.