Electronic Automatic Temperature Control (EATC) Module

The EATC module uses the SCP communication network for communication with the diagnostic tool. The EATC module controls automatic climate functions that maintain the vehicle interior temperature at a constant setting. The EATC module also uses the UBP network for communication with the driver or passenger climate controlled seat modules. Check the SCP circuits between the EATC module C228a and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the SCP network, damage to the DLC C251, damage to the EATC module C228a, or a problem in the in-line connector. For additional information, refer to CLIMATE CONTROL SYSTEM-GENERAL INFORMATION AND DIAGNOSIS .