Past trouble

Carry out diagnosis with particular emphasis on connector(s) or wiring harness in the CAN bus lines between the A/C-ECU and the middle grade multi-center display unit, and the power supply system to the A/C-ECU. For diagnosis procedures, Refer to " HOW TO TREAT PAST TROUBLE " (Refer to HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS - HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
NOTE: For a past trouble, you may not find it by the MUT-III CAN bus diagnostics even if there is any failure in CAN bus lines. In this case, Refer to HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS - HOW TO COPE WITH INTERMITTENT MALFUNCTION ). and check the CAN bus lines. You can narrow down the possible cause of the trouble by referring to the DTC, which is set regarding the CAN communication-linked ECUs (Refer to PRECAUTIONS ON HOW TO REPAIR THE CAN BUS LINE ).