How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2005 Lexus RX 330. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Use this procedure to troubleshoot the front power seat control system with memory function.
The hand-held tester should be used in steps 3 and 5.

VEHICLE BROUGHT TO WORKSHOP
1. GO TO NEXT STEP.
CUSTOMER PROBLEM ANALYSIS CHECK AND PROBLEM SYMPTOM CHECK (See CUSTOMER PROBLEM ANALYSIS CHECK )
1. GO TO NEXT STEP.
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 malfunction) Without code outputs, proceed to A.
  2. (ECU unconnected, communication line malfunction) With code outputs, proceed to B.
1. B: Go to MULTIPLEX COMMUNICATION SYSTEM (See HOW TO PROCEED WITH TROUBLESHOOTING )
2. A: GO TO NEXT STEP.
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.
1. B: Go to step 6 .
2. A: GO TO NEXT STEP.
OVERALL ANALYSIS AND TROUBLESHOOTING
1. ON-VEHICLE INSPECTION
2. PRE-CHECK
  1. Inspection with the hand-held tester (DATA LIST)
  2. Inspection with the hand-held tester (ACTIVE TEST)
3. TERMINALS OF ECU
4. INSPECTION
ADJUSTMENT, REPAIR OR REPLACE END
1. END