B0248

DTC B0248

CIRCUIT DESCRIPTION
The HVAC door actuator is an electronic motor with a feedback potentiometer. The HVAC control module supplies power and ground to the actuator. The HVAC control module controls the direction of the actuator by changing the polarity of the control circuit. When the actuator reaches the desired position, voltage is removed from the control circuit. The HVAC control module determines the current position of the actuator by monitoring the feedback voltage of the door position signal circuit. The feedback potentiometer position is a function of the actuator position.
- Air flow control 3 circuit refers to the front mode actuator
- Air flow control 7 circuit refers to the recirc actuator.
- Temperature control 1 circuit refers to the driver air temperature actuator
- Temperature control 2 circuit refers to the passenger air temperature actuator
- Temperature control 3 circuit refers to the rear air temperature actuator
- Air flow control 10 circuit refers to the rear mode actuator

DTC DESCRIPTORS




This diagnostic procedure supports the following DTCs:
- DTC B0248 Air Flow Control 3 Circuit
- DTC B0268 Air Flow Control 7 Circuit
- DTC B0408 Temperature Control 1 Circuit
- DTC B0418 Temperature Control 2 Circuit
- DTC B0428 Temperature Control 3 Circuit
- DTC B3531 Air Flow Control 10 Circuit

CONDITIONS FOR RUNNING THE DTC
- The ignition is ON.
- Ignition voltage is between 9-16 volts.

CONDITIONS FOR SETTING THE DTC
The actuator door movement is restricted or the actual door position differs from the commanded door position by 4 counts or greater for more than 16 seconds.

ACTION TAKEN WHEN THE DTC SETS
The HVAC control module will not command actuator movement past the point where the stall condition is detected and will continue to make use of the remaining nonrestricted range.

CONDITIONS FOR CLEARING THE DTC
- The DTC will become history if the HVAC control module no longer detects the condition that set the DTC.
- The history DTC will clear after 50 fault-free ignition cycles.
- The DTC can be cleared with a scan tool.

TEST DESCRIPTION

Step 1 - Step 9:

Step 10 - Step 17:

The number below refers to the step number on the diagnostic table.
4. This step verifies that the HVAC control module is able to command the appropriate HVAC actuator.