How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2004 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

VEHICLE BROUGHT TO WORK SHOP
(See CUSTOMER PROBLEM ANALYSIS )
CHECK BODY MULTIPLEX COMMUNICATION SYSTEM (See HOW TO PROCEED WITH TROUBLESHOOTING )
1. Check that the DTC output.
1. DTC OUTPUTS (PROCEED TO " MULTIPLEX COMMUNICATION SYSTEM - DIAGNOSIS ")
2. DTC DOES NOT OUTPUT (GO TO STEP 4 )
PROBLEM SYMPTOM CONFIRMATION
1. SYMPTOM DOES NOT OCCUR (GO TO STEP 5 )
2. SYMPTOM OCCURS (GO TO STEP 6 )
SYMPTOM SIMULATION (See HOW TO PROCEED WITH TROUBLESHOOTING )
(See DTC CHECK )
1. MALFUNCTION CODE (GO TO STEP 7 )
2. NORMAL CODE (GO TO STEP 8 )
(See DTC TABLE )
1. GO TO STEP 9
(See PROBLEM SYMPTOMS TABLE )
(See CIRCUIT INSPECTION and CIRCUIT INSPECTION )
(See TERMINAL OF ECU )
IDENTIFICATION OF PROBLEM
REPAIR OR REPLACE
CONFIRMATION TEST
1. END