GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2002 🢒 Yukon XL - 2WD 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 DTC B0229

Circuit Description

The recirculation actuator is an electronic device that incorporates a stepper motor and feedback potentiometer. The HVAC control module controls the recirculation door position by sending a control signal to the actuator. The signal's value is dependent upon the desired mode selected by the vehicle occupants. As the recirculation actuator moves, the potentiometer produces the actual door position signal that is sent to the HVAC control module. The HVAC control module continues to command the actuator to move until the desired and actual values are equal.

After a calibration or recalibration procedure is performed, the HVAC control module calculates the recirculation actuator travel range. The HVAC control module commands the actuator through it's full range. The HVAC control module stores the learned minimum and maximum position values. The travel range value is calculated by subtracting the minimum and maximum position values. The HVAC control module compares the travel range, minimum and maximum values to calibrated value ranges. If the travel range value is less than or equal to the maximum calibrated limit and greater than or equal to the minimum calibrated limit, then the calibration is considered successful. The HVAC control module continuously compares the actual actuator position to the calibrated minimum and maximum position values.

Conditions for Running the DTC
    • The ignition is ON.
    • Ignition voltage is between 9-16 volts.
    • The HVAC control module keep alive memory battery power must be interrupted to run the range check (recalibration procedure).

Conditions for Setting the DTC
    • Recirculation actuator position signal is less than 5 counts.
    • Recirculation actuator position signal is more than 250 counts.
    • The recirculation actuators total travel range (min-max) is less than or greater than the calibrated limits.

Action Taken When the DTC Sets
    • The DTC is stored in DTC information.
    • The HVAC control module will continue to make use of whatever travel range is still available.

Conditions for Clearing the DTC
    • If the HVAC control no longer detects a failure, then the DTC will become history.
    • The history DTC will clear after 50 ignition cycles without a failure.
    • The DTC can be cleared with a scan tool.

Diagnostic Aids
    • A short to voltage on the 5-volt reference circuit of the recirculation actuator will cause DTC B0229 and DTC B0414 to set.
    • A damaged or broken recirculation door and or actuator can cause this DTC to set.
    • The range fault can only be detected following a check of the actuator travel range. The actuator travel range check (recalibration procedure) can only be initiated by disrupting power to the HVAC control module.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step determines if the air temperature door position is within the specified range of the commanded value.

    2.

  2. Tests for the proper operation of the circuit in the low voltage range.

    3.

  3. Tests for the proper operation of the circuit in the high voltage range. If the jumper fuse opens when you perform this test, then the signal circuit contains a short to ground.

    4.

  4. Tests for a short to voltage in the 5-volt reference circuit.

Step

Action

Values

Yes

No

Schematic Reference: HVAC Schematics

1

Did you perform the HVAC Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - HVAC Systems - Automatic

2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With the scan tool, observe the recirculation door max. position parameter and the recirculation door min. position parameter in the Primary ECC Data List.
  4. Subtract the recirculation door min. position from the recirculation max. position.

Does the result of the calculation indicate that the actual travel of the recirculation actuator is within the specified range?

64-216 counts

Go to Step 3

Go to Step 8

3
  1. Install the scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With the scan tool, command the recirculation actuator from to REC (ON) to OSA (OFF).
  4. With the scan tool, observe the recirculation actuator actual position.

Does the scan tool indicate that the recirculationactuator actual parameter changes within the specified range when it is commanded from OSA to REC?

5-250 counts

Go to Diagnostic Aids

Go to Step 4

4

Test the recirculation actuator ground circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 13

Go to Step 5

5

Test the 5-volt reference circuit of the recirculation actuator for a short to ground or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 13

Go to Step 6

6

Test the recirculation valve position sensor signal circuit for an open, short to ground or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 13

Go to Step 7

7

Important: The recirculation actuator connector and the HVAC control module connector must be connected to correctly perform this test.

  1. Turn on the ignition, with the engine off.
  2. With the scan tool, observe the recirculation actuator actual parameter in the Primary ECC Data List.
  3. Connect a 3-amp fused jumper wire between the recirculation door motor control circuit of the recirculation actuator and the 5 volt reference circuit of the recirculation actuator (drives the door to REC).
  4. Remove and reconnect the jumper wire between the recirculation door control circuit of the recirculation actuator to the ground circuit of the recirculation actuator (drives the door to OSA).

Does the drive shaft of the recirculation actuator rotate and do the counts change?

--

Go to Step 10

Go to Step 9

8

Inspect the recirculation door and the recirculation actuator for the following .

    • Incorrectly installed recirculationactuator.
    • Broken or binding linkages or recirculation door.
    • Obstruction that prevents the recirculation actuator from operating within it's full range of motion.

Did you find and correct the condition?

--

Go to Step 13

Go to Diagnostic Aids

9

Inspect for poor connections at the harness connector of the recirculation actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 13

Go to Step 11

10

Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 13

Go to Step 12

11

Important: Perform the recalibration procedure for the recirculation actuator.

Replace the recirculation actuator. Refer to Recirculation Actuator Replacement in HVAC Systems.

Did you complete the replacement?

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Go to Step 13

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12

Important: Perform the recalibration procedure for the HVAC control module.

Replace the HVAC control module. Refer to HVAC Control Module Replacement .

Did you complete the replacement?

--

Go to Step 13

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13
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

--

Go to Step 2

System OK