Pinpoint Test F: No Communication With The Instrument Cluster Module

WARNING: This page is about a different car, the 2004 Lincoln LS. 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.

F1 CHECK HOT AT ALL TIMES POWER SUPPLY CIRCUIT
- Key in OFF position.
- Disconnect: Instrument Cluster C220b.
- Measure the voltage between the instrument cluster C220b-3, circuit 29-GG11 (OG/BU), harness side and ground.
  
  Fig 1: Measuring Voltage Between Instrument Cluster C220B-3, Circuit 29-GG11 (OG/BU), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
1. Yes : GO to F2.
2. No : REPAIR the circuit. TEST the system for normal operation.

F2 CHECK HOT IN RUN POWER SUPPLY CIRCUITS

Disconnect: Instrument Cluster C220a.
Key in ON position.

Measure the voltage between the instrument cluster and ground as follows:

CONNECTOR PINS CIRCUIT REFERENCE

Connector Pin	Circuit
C220a-11	15-JA14 (GN/BK)
C220b-6	15-GG14 (GN/RD)
C220b-17	75-GG15(YE/GN)

Fig 2: Measuring Voltage Between Instrument Cluster And Ground

Courtesy of FORD MOTOR CO.

Are the voltages greater than 10 volts?

Yes : GO to F3.
No : REPAIR the circuit in question. TEST the system for normal operation.

F3 CHECK THE GROUND CIRCUITS 91-GG11 (BN/RD) AND 31-AL11 (BK) FOR OPEN
- Key in OFF position.
- Measure the resistance between the instrument cluster C220b-13, circuit 91-GG11 (BN/RD), harness side and ground; and between the instrument cluster C220a-6, circuit 31-AL11 (BK), harness side and ground.
  
  Fig 3: Measuring Resistance Between Instrument Cluster C220B-13, Circuit 91-GG11 (BN/RD), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
1. Yes : REFER to MODULE COMMUNICATIONS NETWORK to continue module communication diagnosis.
2. No : REPAIR the circuit in question. TEST the system for normal operation.