B0361

CIRCUIT DESCRIPTION
The HVAC control module commands the left air temperature actuator to move by controlling the voltage supplied on the control circuit. A low voltage of 0 volts moves door toward full cold. A voltage of 2.5 volts stops the door. A high voltage of 5 volts moves the door toward full hot. The HVAC control module determines the current position of the actuator by monitoring the voltage on the signal circuit. The feedback potentiometer is a function of the motor position. A high voltage of 4-5 volts indicates full cold door position. A low voltage of less than 1 volt indicates full hot door position. The HVAC control module controls the left air temperature actuator door positions in order to maintain the selected air temperature.

CONDITIONS FOR RUNNING THE DTC
The ignition is turned ON.

CONDITIONS FOR SETTING THE DTC
The HVAC control module detects the signal circuit is less than 5 counts (0.09 V).

ACTION TAKEN WHEN THE DTC SETS
A default value will be used for the sensor data by the HVAC control module in an attempt to maintain the air temperature selected by the driver. This default value will be displayed on the scan tool.

CONDITIONS FOR CLEARING THE DTC
The DTC will become history if the HVAC control module no longer detects a failure.
^ The history DTC will clear after 100 fault free ignition cycles.
^ The DTC can be cleared with a scan tool.

DIAGNOSTIC AIDS
Check the following conditions:
A disconnected or broken door may also set this DTC by allowing the left air temperature actuator to travel to its internal stops, an overtravel condition. If condition not present, refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.

TEST DESCRIPTION

Steps 1-9:

Steps 10-16:

The numbers below refer to the step numbers on the diagnostic table.
3. Tests for a default setting viewed by the scan tool.
4. Tests for the proper operation of the circuit in the high voltage range.
5. Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.
6. Tests for a short to ground in the 5 volt reference circuit.