Manual Temperature Control (MTC)

The Manual Temperature Control (MTC):

• controls blower motor operation, providing four blower speeds (Low, M1, M2, & High).
• interfaces with the BCM through hardwired circuits.
• provides temperature setting information to the BCM through a resistor.
• provides an A/C request, an EBL request, and mode switch setting information to the BCM through a resistive multiplexed circuit.

The Body Control Module (BCM):

• drives the EBL status indicator in the MTC. Refer to the Service information for additional information about rear window defogger operation.
• drives the electric door actuators (mode, blend, recirc).
• sends and A/C request, over the PCI Bus, to the PCM when A/C operation is desired.
• uses Evaporator Temperature Sensor data to prevent evaporator freeze up while maintaining optimum cooling performance.

The MTC HVAC system uses:

• one, five-wire electric blend door actuator.
• one, five-wire electric mode door actuator.
• one, two-wire electric recirculation door actuator.