B1341

CIRCUIT DESCRIPTION
The HVAC control processor commands the right air temperature actuator to move by controlling the voltage supplied on the control circuit. A low voltage of 0 volts moves the door toward full hot. A voltage of 2.5 volts stops the door. A high voltage of 5 volts moves the door toward full cold. The HVAC control processor 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 processor controls the door positions of the right air temperature actuator 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 processor detects the signal circuit is less than 5 counts (0.09 volts) or greater than 250 counts (4.90 volts).

ACTION TAKEN WHEN THE DTC SETS
The HVAC control processor uses a default value for the sensor data in order to maintain the air temperature that is selected by the driver.

CONDITIONS FOR CLEARING THE DTC
^ The DTC will become history if the HVAC control processor no longer detects a condition.
^ The history DTC clears after 50 fault free ignition cycles.
^ The DTC can be cleared with a scan tool.

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

TEST DESCRIPTION

Steps 1-4:

Steps 5-15:

The numbers below refer to the step numbers on the diagnostic table.
3. Tests for the proper operation of the circuit in the high voltage range.
4. 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.
5. Tests for a short to ground in the 5 volt reference circuit.