How To Proceed With Troubleshooting

HINT:

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

1. VEHICLE BROUGHT TO WORKSHOP 
2. INSPECT BATTERY VOLTAGE 

   Standard voltage: 11 to 14 V 

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

3. CHECK LIN COMMUNICATION SYSTEM 
   1. Check if the LIN communication system is functioning normally (See HOW TO PROCEED WITH TROUBLESHOOTING ).

      Result 

      RESULT CHART
      
      

      Result	Proceed to
      LIN communication system is normal	A
      LIN communication system is not normal	B

   B: Go to LIN COMMUNICATION SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

   A: Go to next step 

4. CHECK CAN COMMUNICATION SYSTEM 
   1. Check if the CAN communication system is functioning normally (See HOW TO PROCEED WITH TROUBLESHOOTING ).

      Result 

      RESULT CHART
      
      

      Result	Proceed to
      CAN communication system is normal	A
      CAN communication system is not normal	B

   B: Go to CAN COMMUNICATION SYSTEM  (See PROBLEM SYMPTOMS TABLE )

   A: Go to next step 

5. PROBLEM SYMPTOMS TABLE 
   1. Refer to Problem Symptoms Table (See PROBLEM SYMPTOMS TABLE  ).

      Result 

      RESULT CHART
      
      

      Result	Proceed to
      Fault is not listed in Problem Symptoms Table	A
      Fault is listed in Problem Symptoms Table	B

   B:  Go to step  7

   A: Go to next step 

6. OVERALL ANALYSIS AND TROUBLESHOOTING* 
   1. Terminals of ECU (See TERMINALS OF ECU  ).
   2. Data List / Active Test (See DATA LIST / ACTIVE TEST  ).
   3. Operation Check (See OPERATION CHECK  ).
7. REPAIR OR REPLACE 
8. CONFIRMATION TEST 

   NEXT: END