How To Proceed With Troubleshooting

HINT: 

• Use these procedures to troubleshoot the audio system.
• *: Use the Techstream.

1. VEHICLE BROUGHT TO WORK SHOP 

   NEXT: Go to next step 

2. CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK 

   NEXT: Go to next step 

3. INSPECT BATTERY VOLTAGE 

   Standard voltage

   11 to 14 V

   If the voltage is below 11 V, recharge or replace the battery before proceeding.

   NEXT: Go to next step 

4. INSPECT COMMUNICATION FUNCTION OF LARGE-SCALE MULTIPLEX COMMUNICATION SYSTEM (BEAN)* 
   1. Use the Techstream to check if the Multiplex Communication System (MPX) is functioning normally.
      RESULT:
      
      

      Result	Proceed to
      MPX DTC is not output	A
      MPX DTC is output	B

      B → Go to MULTIPLEX COMMUNICATION SYSTEM 

      A: Go to next step 

5. CHECK FOR DTC 
   1. Check for DTCs and note any codes that are output.
   2. Delete the DTC.
   3. Recheck for DTCs. Based on the DTC output in (a), try to force output of the audio system DTC by simulating the operation indicated by the DTC.
      RESULT:
      
      

      Result	Proceed to
      DTC does not reoccur	A
      DTC reoccurs	B

      B → Go to step 8 

      A: Go to next step 

6. PROBLEM SYMPTOMS TABLE 
   RESULT:
   
   

   Result	Proceed to
   Fault is not listed in problem symptoms table	A
   Fault listed in problem symptoms table	B

   B → Go to step 8 

   A: Go to next step 

7. OVERALL ANALYSIS AND TROUBLESHOOTING 
   1. DATA LIST / ACTIVE TEST. Refer to DATA LIST / ACTIVE TEST 
   2. Terminals of ECU. Refer to TERMINALS OF ECU 

      NEXT: Go to next step 

8. ADJUST, REPAIR OR REPLACE 

   NEXT → END