How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2006 Lexus GS 430 and 2006 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.

VEHICLE BROUGHT TO WORKSHOP
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CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK
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INSPECT DIAGNOSTIC TROUBLE CODES
1. If the audio system is equipped with a multi-display, check DTCs in the LEXUS NAVIGATION SYSTEM section.
2. If the system cannot enter the diagnosis mode, inspect each AVC-LAN communication signal and repair or replace malfunctioning parts.
3. Check for normal functioning of the audio system.
  1. Without code outputs, proceed to A.
  2. With code outputs, proceed to B.
B : Go to step 5

A : Go to next step
CHECK FOR DTC
1. Check for DTCs and note any codes that are output.
2. Delete the DTC.
3. Recheck for DTCs. Try to prompt the DTC by simulating the original activity that the DTC suggests.
  1. If the DTC does not reoccur, proceed to A.
  2. If the DTC reoccurs, proceed to B.
    HINT:
    
    Find the output code on the diagnostic trouble code chart.
B : Go to step 7

A : Go to next step
PROBLEM SYMPTOMS TABLE
1. If the fault is not listed on the PROBLEM SYMPTOMS TABLE , proceed to A.
2. If the fault is listed on the PROBLEM SYMPTOMS TABLE , proceed to B.
B : Go to step 7

A : Go to next step
OVERALL ANALYSIS AND TROUBLESHOOTING
1. Terminals of ECU.
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REPAIR OR REPLACE
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CONFIRMATION TEST
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