How To Proceed With Troubleshooting

1. Ask the customer about symptoms and confirm malfunctions.

• THE SCREEN DISPLAYS NOTHING (GO TO STEP   9 , AND PROCEED TO "BLACK SCREEN (NO IMAGE APPEARS ON NAVIGATION/AUDIO SCREEN)") 
• OTHER SYMPTOMS (GO TO STEP 3) 

1. Use the intelligent tester to check for normal function of the body multiplex communication system.

• A CODE IS OUTPUT (PROCEED TO "BODY MULTIPLEX COMMUNICATION SYSTEM") 
• A CODE IS NOT OUTPUT (GO TO STEP 4) 

• APPLICABLE (THIS IS NOT A MALFUNCTION) 
• NOT APPLICABLE (GO TO STEP 5) 

HINT:

If the system cannot enter the diagnostic mode, inspect each AVC-LAN communication component and repair or replace problem parts.

• A CODE IS OUTPUT (GO TO STEP 6) 
• A CODE IS NOT OUTPUT (GO TO STEP   9 ) 

1. Clear the DTCs and finish the diagnostic mode.

   HINT:

   The currently output DTCs may not indicate actual malfunctions depending on the vehicle conditions.

HINT:

• If the system cannot enter the diagnosis mode, inspect the AVC-LAN and all the components that connect to the AVC-LAN for short circuits.
• Even if the malfunction symptom is not confirmed, check for diagnostic trouble codes. This is because the system stores past diagnostic trouble codes.
• Refer to the detailed description on the diagnostic screen, as necessary (See NAVIGATION CHECK MODE  ).
• Check the diagnostic trouble code and inspect the area the code indicates.

• A CODE IS OUTPUT (GO TO STEP 8) 
• A CODE IS NOT OUTPUT (GO TO STEP   9 ) 

1. Find the output code on the diagnostic trouble code chart.

GO TO STEP   11 

1. Find the applicable symptom code in the problem symptoms table.

   HINT:

   If the symptom does not recur and no code is output, perform the symptom reproduction method (See PROBLEM SYMPTOMS TABLE  ).

• THERE IS AN APPLICABLE SYMPTOM CODE IN THE TABLE (GO TO STEP   11 ) 
• THERE IS NO APPLICABLE SYMPTOM CODE IN THE TABLE (GO TO STEP   10 ) 

1. Adjust, repair, or replace as necessary.

HINT:

After deleting the DTCs, recheck for diagnostic trouble codes.

END