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: Checking Two-Line Bus System - Control Module 1 Is Not Communicating With Control Modules 2 And 3

Fig 2: DTC Memories Table - Control Module 1 Is Not Communicating With Control Modules 2 And 3, Example 1

• Switch ignition off.
• Disconnect the control modules connected across the bus lines and check the bus lines for an open circuit.
• If you cannot find a malfunction in the bus lines, replace control module 1.