I was looking for an example like Testing GM HVAC with GM Tech2. I have an 08 CTS that has the intermittent ticking mode door actuator. After an accidental battery drain, the passenger side stopped blowing cold air although for the past few months I noticed at times it lagged behind the driver side, temp wise. The driver side had always been fine until after the battery drain. It normally starts out fine with vent temps as low as 37 deg but has begun to fade mainly when the car is started up after cabin temps are already high where it hovers around 70 deg. I plugged in the Tech 2 which I’m still fairly new to and checked the blend doors cautiously as I didn’t want to create more trouble by initiating a test that I did not fully understand.

There were no stored codes and the mode door and recirculation door appeared to have functioned normally as the values and air sound in the vents changed when they were commanded. The blend door motors however, both stayed fixed at 51 counts which I believe corresponds to the lowest temp setting of 60 deg they were set at. When I increased the console temp it also increased on the Tech 2 display but the counts did not change and the vent temps seemed to maintain the same bias with the passenger side blowing hot. The counts did not change when the temps were raised for each actuator using theAuto Scan Tool Tech 2 either.

I did not perform the "On/Off” button test that you did here because I was not sure what it would do at the time, but intend to give that a try. I have also read that there is a calibration procedure that can be performed that I need to investigate further. I believe my situation is a combination of both calibration and actuator deterioration being brought to the surface by the recent battery drain.

I appreciate the post: Testing GM HVAC with Tech2
, this is good information that is hard to come by in such a straightforward presentation.?

I recommend that you buy gm tech2 on OBD2 website. They are cheap, logistics is fast, and after-sales service is also very good. I have been using it for a year and there is no problem with the quality of the product.

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Step 1

Plug the wiTech MicroPod 2 device into the OBD port and connect the USB cable from the device to your laptop. This wakes the BUS on the car.

Step 2

Manually enter the VIN of the vehicle. This gives you access to the module list. Select the RFH (Radio Frequency Hub) module. This is the module where the key is registered.

Step 3

Next select "Miscellaneous Functions,” then "Program Ignition Fobix.” At this point, you are prompted to enter the VIN again, followed by the four-digit PIN Code.

Step 4

After the four-digit pin is entered you are prompted to hit continue to "Program Ignition FOBIK.” Once you hit continue you must press the UNLOCK button on the FOBIX within 30 seconds (the FOBIX needs to be located near the center console during this procedure).

Step 5

Programming of the Ignition FOBIX is now successful. The new key key is accepted into the car, and the ignition will now turn on and start the car. At this point, you also have the option to program a second key.

Things to Remember:

You must be online to program the key.
The PIN Code is only good for one session, which lasts 72 hours. After 72 hours the pin code expires.
If you input the wrong code for three-time it locks the BCM and you cannot service the vehicle for 24 hours.
The key is one-time programmable. Once married to the vehicle it is locked to the car forever. The key can be erased from the car and put back into the same car, but can’t be switched to another car.
The placement of the key during initialization is important. It needs to be placed either behind the shifter or in the center console.

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