How To Proceed With Troubleshooting

HINT:

• Use this procedure to troubleshoot the defogger system.
• The hand-held tester should be used in steps  3 and  5.

1. VEHICLE BROUGHT TO WORKSHOP 
2. CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK (See  CUSTOMER PROBLEM ANALYSIS CHECK   ) 
3. CHECK COMMUNICATION FUNCTION OF LARGE-SCALE MULTIPLEX COMMUNICATION SYSTEM (BEAN) 
   1. Use the hand-held tester to check for normal function of the multiplex communication system.
      1. (ECU not connected, communication line malfunctioning) Without code outputs, proceed to A.
      2. (ECU not connected, communication line malfunctioning) With code outputs, proceed to B.

   B: Go to MULTIPLEX COMMUNICATION SYSTEM (See  DIAGNOSTIC TROUBLE CODE CHART  ) 

   A: Go to next step 

4. SEE  PROBLEM SYMPTOMS TABLE   ) 
   1. If the fault is not listed on the problem symptoms table, proceed to A.
   2. If the fault is listed on the problem symptoms table, proceed to B.

   B: Go to step 6 

   A: Go to next step 

5. OVERALL ANALYSIS AND TROUBLESHOOTING 
   1. DATA LIST/ACTIVE TEST (See DATA LIST/ACTIVE TEST  )
      1. Inspection with the hand-held tester (ACTIVE TEST)
   2. Terminals of ECU (See TERMINALS OF ECU  )
   3. Inspection (see INSPECTION )
6. ADJUST, REPAIR OR REPLACE 
7. CONFIRMATION TEST 

   END