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 WORKSHOP
(SEE CUSTOMER PROBLEM ANALYSIS )
CHECK MULTIPLEX COMMUNICATION SYSTEM (SEE HOW TO PROCEED WITH TROUBLESHOOTING )
(SEE CHECK AND CLEAR DTC )
PROBLEM SYMPTOM CONFIRMATION
SYMPTOM OCCURS (GO TO STEP 7 )

SYMPTOM DOES NOT OCCUR (GO TO STEP 6 )
SYMPTOM SIMULATION (SEE HOW TO PROCEED WITH TROUBLESHOOTING )
(SEE DTC CHECK )
MALFUNCTION CODE (GO TO STEP 8 )

NORMAL CODE (GO TO STEP 9 )
(SEE DTC TABLE )
GO TO STEP 11
(SEE PROBLEM SYMPTOMS TABLE )
(SEE CIRCUIT INSPECTION and AUTOMATIC SOUND LEVELIZER FUNCTION IS ABNORMAL OPERATION )
CONFIRMATION TEST
END