How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

Troubleshoot in accordance with the procedure.

VEHICLE BROUGHT IN
CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK (See CUSTOMER PROBLEM ANALYSIS CHECK )
INSPECT COMMUNICATION FUNCTION OF LARGE-SCALE BODY MULTIPLEX COMMUNICATION SYSTEM (BEAN)
1. Check that there is no abnormality in the communication system by inspecting the communication function of the body multiplex communication system with the hand-held tester.
  1. (ECU unconnected, communication line abnormal) Without code outputs, proceed to "A".
  2. (ECU unconnected, communication line abnormal) With code outputs, proceed to "B".
    B: GO TO BODY MULTIPLEX COMMUNICATION (See MULTIPLEX COMMUNICATION SYSTEM - DIAGNOSIS )
    
    A: Go to next step.
DIAGNOSTIC TROUBLE CODE CHECK (See DIAGNOSTIC TROUBLE CODE CHART )
1. Check the diagnostic trouble code.
  1. Without code outputs, proceed to ""A".
  2. With code outputs, proceed to "B".
    B: Go to step 7
    
    A: Go to next step.
PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )
1. Without applicable symptoms, proceed to ""A".
2. With applicable symptoms, proceed to "B".
  B: Go to step 7
  
  A: Go to next step.
PERFORM TROUBLESHOOTING IN FOLLOWING METHOD, DEPENDING ON MALFUNCTION SYMPTOM
1. Pre-check (See PRE-CHECK )
  1. Inspection with the hand-held tester (ECU DATA LIST)
  2. Inspection with the hand-held tester (ACTIVE TEST)
2. Terminals of ECU (See TERMINALS OF ECU )
3. On-vehicle inspection (See ON-VEHICLE INSPECTION )
ADJUSTMENT, REPAIR OR REPLACEMENT
END