How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2002 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.

Vehicle Brought In
Symptom Check
Inspect Communication Function Of Large-Scale Body Multiplex Communication System (BEAN)
1. Check there is no abnormality in the communication system by inspecting the communication function of the body multiplex communication system with hand-held tester.
  1. (ECU unconnected, communication line abnormal). Without code outputs, proceed to step 4.
  2. (ECU unconnected, communication line abnormal) With code outputs, proceed to BODY MULTIPLEX COMMUNICATION SYSTEM - DIAGNOSTICS .
Diagnosis Code Check (See DIAGNOSTIC TROUBLE CODE CHART )
1. Check diagnosis code.
  1. Without code outputs, proceed to step 5.
  2. With code outputs, proceed to step 7.
Symptoms Table (See PROBLEM SYMPTOMS TABLE )
1. Without applicable symptoms, proceed to step 6.
2. With applicable symptoms, proceed to step 7.
Perform Troubleshooting In The Following Method, Depending On Malfunction Symptom:
1. Pre-inspection (See PRE-CHECK )
  1. Inspection with hand-held tester (ECU DATA MONITOR)
  2. Inspection with hand-held tester (ACTIVE TEST)
2. ECU terminal position
Adjustment, Repair Or Replacement
END