A/C Request

Output Control

The HVAC control module sends out a A/C request signal to turn on the A/C compressor when you select ON. The request signal should stay active until commanded OFF.

Blower Motor

Output Control

The HVAC control module commands the blower motor on to maximum speed when you select ON. The HVAC control module commands the blower motor to low speed when you select OFF.

Defrost Mode

Miscellaneous Test

Important: You must exit the Defrost Mode menu to return to normal operating mode.

When you select ON, the HVAC control module goes into defrost mode.

Heater Mode

Miscellaneous Test

Important: You must exit the Heater Mode menu to return to normal operating mode.

When you select ON, the HVAC control module goes into heater mode.

Left Mix Motor

HVAC Motors

The HVAC control module commands the left air temperature actuator towards 198 counts when you select ON. The HVAC control module commands the left air temperature actuator towards 0 counts when commanded OFF.

Recirculation Door

HVAC Motors

The HVAC control module commands the air inlet door to the recirculation position when you select ON. The HVAC control module commands the air inlet door to the ambient air position when you select OFF.

Right Mix Motor

HVAC Motors

The HVAC control module commands the right air temperature actuator towards 0 counts when you select ON. The HVAC control module commands the right air temperature actuator towards 195 counts when you select OFF.

Vent Mode

Miscellaneous Test

Important: You must exit the Vent Mode menu to return to normal operating mode.

When you select ON, the HVAC control module goes into vent mode.

A/C Relay

Engine Output Controls

The PCM/ECM energizes the A/C compressor clutch relay when you select ON. The A/C compressor clutch should remain engaged until commanded OFF.