Troubleshooting Hints

Malfunction of the connector [joint connector (CAN1), A/C-ECU <vehicles with A/C> or heater control unit <vehicles without A/C> connector improperly connected]
Malfunction of the wiring harness [open circuit between the A/C-ECU <vehicles with A/C> or heater control unit <vehicles without A/C> connector and the joint connector (CAN1), power supply circuit to the A/C-ECU <vehicles with A/C> or heater control unit <vehicles without A/C>]
Malfunction of the A/C-ECU <vehicles with A/C> or heater control unit <vehicles without A/C>