How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2006 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.

The intelligent tester can be used in steps 4, 6, 8 and 9.

VEHICLE BROUGHT TO WORKSHOP
NEXT
CUSTOMER PROBLEM ANALYSIS
1. Confirm problem symptoms.
  NEXT
CHECK MULTIPLEX COMMUNICATION SYSTEM
1. Check for the DTC outputs.
  DTC IS OUTPUT: CHECK MULTIPLEX COMMUNICATION CIRCUIT
  
  DTC IS NOT OUTPUT: Go to step 4
CHECK CAN COMMUNICATION SYSTEM
1. Check for the DTC outputs.
  DTC IS OUTPUT: CHECK CAN COMMUNICATION CIRCUIT
  
  DTC IS NOT OUTPUT: Go to step 5
WARNING LIGHT CHECK
NEXT
CHECK DTC (Present and Past DTCs)
DTC IS OUTPUT (INCLUDING NORMAL SYSTEM CODE): Go to step 7

DTC IS NOT OUTPUT: PROBLEM SYMPTOMS TABLE
DTC CHART
NEXT
CIRCUIT INSPECTION
NEXT
REPAIR
NEXT
CLEAR DTC (Present and Past DTCs)
NEXT
CHECK DTC (Present and Past DTCs)
DTC IS NOT OUTPUT: Go to step 12

DTC IS OUTPUT: Go to step 7
CONFIRMATION TEST
NEXT

END