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Code B0229

Tiny
BRENTH
  • MEMBER
  • 2004 GMC YUKON
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 68,000 MILES
Used a code reader to look at live data and found a "0" count on recirculate actuator. Purchased new actuator and plugged it in as recirculate actuator, performed recalculate function for actuator doors. Live data still shows "0"count for recirculate door and B0229 code. Can I get wiring diagram for HVAC system and actuator pin outs for actuators.
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Tuesday, January 28th, 2020 AT 8:20 AM

11 Replies

Tiny
94 TRANSAM
  • MECHANIC
  • 680 POSTS
B0229 GMC Possible Causes:

Faulty Re-circulation Actuator
Re-circulation Actuator harness is open or shorted
Re-circulation Actuator circuit poor electrical connection
Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

I would look at the last one as a start point. My tech site is down right now but I will get you the diagrams when it comes back up.

Here is a guide to help check the wiring with the HVAC wiring diagrams below:

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Tuesday, January 28th, 2020 AT 4:34 PM
Tiny
BRENTH
  • MEMBER
  • 4 POSTS
Thank you Rich, looking forward to the diagrams to further investigate this issue.
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Wednesday, January 29th, 2020 AT 7:37 AM
Tiny
94 TRANSAM
  • MECHANIC
  • 680 POSTS
I updated the wiring diagrams above please check it out.

Rich
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+1
Wednesday, January 29th, 2020 AT 9:55 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
It sounds like the re-circulation blend door actuator circuit is out. Please use the wiring diagrams above to check the circuits. Please let us know what you find. We are interested to see what it is.
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-1
Wednesday, January 29th, 2020 AT 2:32 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Are you replacing the correct blend door actuator? This guide will help:

https://www.2carpros.com/articles/replace-blend-door-motor

Please run down this guide and report back.
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Wednesday, January 29th, 2020 AT 2:36 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Actuator Re-calibration

When replacing the HVAC control module it will be necessary to allow the HVAC control module to perform a calibration process. When installing the HVAC control module be sure to perform the following:

Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result.

1. Place the ignition switch to the OFF position.
2. Disconnect the scan tool.
3. Install the HVAC control module.
4. Connect all previously disconnected components.
5. Start the vehicle.
6. Wait 40 seconds for the HVAC control module to self-calibrate.
7. Verify that no DTCs have set as current DTCs.

When replacing the HVAC actuator it will be necessary to allow the HVAC control module to perform a calibration process. When installing the HVAC actuator be sure to perform one of the following:

Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result.

Preferred Method (w/Scan Tool)
1. Clear all DTCs.
2. Place the ignition switch in the OFF position.
3. Install the HVAC actuator.
4. Connect all previously disconnected components.
5. Start the vehicle.
6. With the scan tool, initiate the Motor Re-calibration feature of the Heating and Air Conditioning Special Functions menu.
7. Verify that no DTCs have set as current DTCs.

Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result.

Alternate Method (w/o Scan Tool)
1. Clear all DTCs.
2. Place the ignition switch to the OFF position.
3. Install the HVAC actuator.
4. Connect all previously disconnected components.
5. Remove the HVAC/ECAS fuse for a minimum of 10 seconds.
6. Install the HVAC/ECAS fuse.
7. Start the vehicle.
8. Wait 40 seconds for the HVAC control module to self-calibrate.
9. Verify that no DTCs have set as current DTCs.
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Wednesday, January 29th, 2020 AT 2:38 PM
Tiny
BRENTH
  • MEMBER
  • 4 POSTS
Hi Ken, thanks for the heads up. Just a note. With the scanner I use. I can see the requested door position, the actual position and motor operation, I have verified operation of 3 of the 4 doors, the only one not responding is the re-circulation door on the very top on the passengers side. I get no response or feedback when the re-circulation button impressed on the control panel. Any other thoughts would be welcome.
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Wednesday, January 29th, 2020 AT 2:40 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
If all the connection are good It sounds like the controller has gone bad with no signal to the recirculation actuator. Here is how to replace the unit.
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Thursday, January 30th, 2020 AT 9:54 AM
Tiny
BRENTH
  • MEMBER
  • 4 POSTS
Good afternoon guys, after doing lots of testing and verifying this is what I found: all wires are good between the actuator and the AC controller unit. I used a new actuator first as a test unit and found 4.7 volts to the actuator, which is what it is at the controller as well. I removed the re-circulation actuator motor signal wire from the plug to verify voltages and operation. I found the voltage at the signal wire to remain constant at 2.4 volts. When I disconnect the signal wire to the actuator the motor would run clockwise. If I touched the signal wire to ground the motor would run counterclockwise. While the motor is running, if I touched the signal wire to the pinout at 2.4 volts the actuator would stoat any position. I then reconnected the re-circulation door actuator and performed the same tests. Found the door to open and close smoothly and also verified that on the feedback wire which returned a smooth voltage change from 0 to 3.8 volts and back. Performed several re-calibrate procedures and saw the signal wire go to 0 volts and to 2.4 volts. I can see the door closed, it never opens unless I disconnect the motor signal wire t0o a no connection condition, then the door opens. I would concluded the the controller is defective at this point. Do you guys feel the same or am I missing something?
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Thursday, January 30th, 2020 AT 11:40 AM
Tiny
94 TRANSAM
  • MECHANIC
  • 680 POSTS
Yes, it sounds like the transistor that switches the polarity to the motor went bad.

Rich
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Thursday, January 30th, 2020 AT 4:59 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
The new part it is OEM? If so yes it does sounds like the controller. Please let us know what happens.
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Saturday, February 1st, 2020 AT 10:21 AM

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