Pinpoint Test A: No Communication With The Instrument Cluster

A1 CHECK CIRCUIT 29-GG14 (OG) FOR POWER
- Key in OFF position.
- Disconnect: Instrument Cluster C2220.
- Measure the voltage between the instrument cluster C2220 pin 28, circuit 29-GG14 (OG), harness side and ground.
  
  Fig 1: Measuring Voltage Between Instrument Cluster C2220 Pin 28, Circuit 29-GG14 (OG), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
  - Yes : GO to A2.
  - No : REPAIR the circuit. TEST the system for normal operation.
A2 CHECK CIRCUIT 75-GG14 (YE/BU) FOR POWER
- Key in ACCESSORY position.
- Measure the voltage between the instrument cluster C2220 pin 6, circuit 75-GG14 (YE/BU), harness side and ground.
  
  Fig 2: Measuring Voltage Between Instrument Cluster C2220 Pin 6, Circuit 75-GG14 (YE/BU), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
  - Yes : GO to A3.
  - No : REPAIR the circuit. TEST the system for normal operation.
A3 CHECK CIRCUIT 15-GG14 (GN/RD) FOR POWER
- Key in ON position.
- Measure the voltage between the instrument cluster C2220 pin 12, circuit 15-GG14 (GN/RD), harness side and ground.
  
  Fig 3: Measuring Voltage Between Instrument Cluster C2220 Pin 12, Circuit 15-GG14 (GN/RD), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
  - Yes : GO to A4.
  - No : REPAIR the circuit. TEST the system for normal operation
A4 CHECK CIRCUIT 91-GG14 (BK/OG) FOR AN OPEN
- Key in OFF position.
- Measure the resistance between the instrument cluster C2220 pin 30, circuit 91-GG14 (BK/OG), harness side and ground.
  
  Fig 4: Measuring Resistance Between Instrument Cluster C2220 Pin 30, Circuit 91-GG14 (BK/OG), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
  - Yes : REFER to MODULE COMMUNICATIONS NETWORK to continue diagnosis of the communications network.
  - No : REPAIR the circuit. TEST the system for normal operation.