Example 1:

From the DTCs stored in the memories, you have determined that control module 1 is not communicating with control modules 2 and 3.

Fig 1: Schematic - Control Module 1 Not Communicating With Control Modules 2 & 3

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Fig 2: DTC Memory - Control Module 1 Not Communicating With Control Modules 2 & 3

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• Switch ignition off.
• Disconnect the control modules connected across the bus wires and check the bus wires for an open circuit.

  See appropriate System Wiring Diagram article.

• Replace control module 1 if no malfunctions can be found in the bus wires.