Discussion in '4th Gen DIY' started by STecoD, May 3, 2019.
Here are snapshots of HVAC module test results.
Maybe a bad module? Wiring harness tested good.
One thing they both have in common is right blend door binding. If this is the case, B11C8 will set off B11C9. I can post photos of the troubleshooting if you need it.
That would be awesome! When I replaced the actuator I made sure the blend door wasn't binding throughout it's travel.
Thanks! Looks like I'll be busy tomorrow..
Thanks for the info Jimmy07 I'm going to copy that info for myself. You never know when you may have an issue. I will say after helping STecoD with his and installing my own the blend doors on the HVAC box don't seem like they would bind up to easily but I guess anything is possible. At least you were able to retrieve some codes to help point you in the right direction with Jimmy07's trouble shooting guide. Hopefully you will find something when you pull it apart.
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Didn’t start troubleshooting until this afternoon. Cleared the codes and calibrated the actuators. Got the same fault codes again. Decided to replace the wire from the HVAC module to the grey inline plug. Just in case the pulse rate is being influenced by the type wire, used aircraft grade wire. It’ll be a busy weekend so efforts will resume next week.
After family visits and other necessary events I was finally able to resume troubleshooting the HVAC issue last Saturday. To confirm that the actuator wasn’t binding I decided to remove the panel. l followed the same steps as before to disconnect and remove the actuator and confirmed the passenger temp door wasn’t binding.
Sunday I rewired the actuator plug to the grey plug and checked continuity with positive results. Reinstalled the passenger temp actuator and used the troubleshooting guides provided by jimmy07 to pinpoint location of the HVAC issue. All the wiring checked normal but error codes B11C8 and B11C9 returned after resetting. The end result to both code errors pointed to a bad HVAC module. Finally, something concrete. Thanks again jimmy07!
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