System Controls

The ATC Module:

• is fully addressable with the DRBIII®.
  • The DRBIII® communicates with the ATC Module through the Diagnostic Link Connector (DLC) via a K-Line.
• communicates with other modules over the Controller Area Network (CAN) C Bus.
• controls A/C clutch operation.
• controls EBL operation.
• controls water cycle valve operation.
  • The water cycle valve is a normally open valve, meaning that it allows full engine coolant flow through the heater core when no power is delivered to the valve. The ATC controls the valve with a pulse width signal. The lower the percentage of the pulse width signal the more the valve is open.
• controls Residual Heat Utilization (REST) function.
• controls blower motor operation, providing four blower speeds (Low, M1, M2, & High).
• controls recirculation air solenoid valve.
• controls the mode door via cables.
• controls the main power supply to the Heater Booster (if equipped).
• uses air inlet temperature sensor, air outlet temperature sensor, and evaporator temperature sensor input, as well as data from other modules to maintain occupant comfort levels.