How To Proceed With Troubleshooting

HINT:

• Use these procedures to troubleshoot the audio system.
• The hand-held tester should be used in step  4.

1. VEHICLE BROUGHT TO WORK SHOP 
   1. NEXT: Go to next step. 
2. CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK (See  CUSTOMER PROBLEM ANALYSIS CHECK   ) 
   1. NEXT: Go to next step. 
3. INSPECT BATTERY VOLTAGE 

   Standard: 11 to 14 V 

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

   1. NEXT: Go to next step. 
4. INSPECT COMMUNICATION FUNCTION OF LARGE-SCALE MULTIPLEX COMMUNICATION SYSTEM (BEAN) 
   1. Use the hand-held tester to check if the Multiplex Communication System (MPX) is functioning normally.

      Result: 

      DTC OUTPUT
      
      

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

   1. B: Go to MULTIPLEX COMMUNICATION SYSTEM (See  PRECAUTION  ) 
   2. A: Go to next step. 
5. CHECK FOR DTC (See  DIAGNOSTIC TROUBLE CODE TABLE   ) 
   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: 

      DTC OUTPUT
      
      

      Result	Proceed to
      DTC does not reoccur	A
      DTC reoccurs	B

   1. B: Go to step   8 . 
   2. A: Go to next step. 
6. See  PROBLEM SYMPTOMS TABLE  

   Result: 

   PROBLEM SYMPTOMS
   
   

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

   1. A: Go to next step. 
7. OVERALL ANALYSIS AND TROUBLESHOOTING 
   1. See DATA LIST/ACTIVE TEST 
   2. See TERMINALS OF ECU 
   3. See INSPECTION 
   1. NEXT: Go to next step. 
8. ADJUST, REPAIR OR REPLACE 
   1. NEXT: END