How To Proceed With Troubleshooting

HINT:

• Use these procedures to troubleshoot the navigation system.
• *: Use the intelligent tester.

1. VEHICLE BROUGHT TO WORKSHOP 
2. INSPECT BATTERY VOLTAGE 

   Standard voltage: 

   11 to 14 V 

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

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

   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 

4. BASIC INSPECTION 
   1. Turn the ignition switch to ACC.
   2. Check whether or not the display appears on the radio receiver.

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   Display appears	A
   Display does not appear	B

   B: PROCEED TO PROBLEM SYMPTOMS TABLE 

   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 REFERENCE
   
   

   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 REFERENCE
   
   

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

   B: Go to step  8

   A: Go to next step 

7. OVERALL ANALYSIS AND TROUBLESHOOTING 
   1. Terminals of ECU (see TERMINALS OF ECU  )
8. ADJUST, REPAIR OR REPLACE 

   NEXT: END