How To Proceed With Troubleshooting

HINT:

• Use this procedure to troubleshoot the LEXUS link system.
• The hand-held tester should be used in step 3.

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 body multiplex communication system.
      1. (ECU unconnected, communication line malfunctioning) Without code outputs, proceed to A.
      2. (ECU unconnected, communication line malfunctioning) With code outputs, proceed to B.

   B: Go to MULTIPLEX COMMUNICATION SYSTEM (SEE  HOW TO PROCEED WITH TROUBLESHOOTING  ) 

   A: Go to next step 

4. CHECK FOR DTC (See  DIAGNOSTIC TROUBLE CODE CHART  ) 
   1. Check for DTCs and note any codes that are output.
   2. Delete the DTC.
   3. Recheck for DTCs. Try to prompt the DTC by simulating the original activity that the DTC suggests.
      1. If the DTC does not reoccur, proceed to A.
      2. If the DTC reoccurs, proceed to B.

   B: Go to step 7 

   A: Go to next step 

5. PROBLEM SYMPTOMS TABLE (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 7 

   A: Go to next step 

6. OVERALL ANALYSIS AND TROUBLESHOOTING 
   1. Lexus link system infrastructure troubleshooting (see DTC CHECK/CLEAR ).
7. ADJUSTMENT, REPAIR OR REPLACE 

   END