Trouble Shooting Procedure (Body Control System)

To ensure correct trouble shooting procedures are followed, trouble shooting should be done in the following sequence:

• Record Customer Complaint
  
  Ensure all customer complaints or observations are recorded.
• Confirm Symptoms
  
  Determine if original symptoms still exist.
• Diagnose & Repair
  
  Ensure body Electronic Control Unit (ECU) is able to communicate with rest of multiplex control system. See MULTIPLEX CONTROL SYSTEMS - AVALON article. Once proper communication with multiplex control system is established, trouble shoot appropriate system by symptom and perform appropriate test listed under SYSTEM TESTS. See SYMPTOM INDEX (BODY CONTROL SYSTEM)  table under SYSTEM TESTS. When performing trouble shooting for body control system, it may be necessary to perform pin voltage test for body ECU to ensure proper voltage or input signal exists. See BODY ELECTRONIC CONTROL UNIT  under PIN VOLTAGE TESTS.
• Verification Procedure
  
  Ensure all symptoms and/or complaints have been repaired.