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RR/HVAC fuse 30amp located in the under hood fuse box. You can check it but highly doubt it's the problem . More then like it's the blower motor control module that's bad .
Circuit/System Description
The auxiliary blower motor is a variable speed fan. The HVAC control module controls the fan speed by sending a pulse width modulated signal to the auxiliary blower motor control module. The auxiliary blower motor control module varies the duty cycle across the auxiliary blower motor in relation to the pulse width modulated signal. The auxiliary blower motor speed can be adjusted from 10 percent to 90 percent duty cycle (PWM), 90 percent is high speed fan.
Watch this video for testing purpose's only , this is a front blower motor control module . Same way your back one works . GM is GM Chevy , Buick ,GMC , Cadillac .
If you don't see anything on the radio saying "auxiliary output" with a little earphone jack then you aren't Aux ready.
You might be able to go to a stereo shop and have them install an auxiliary output plug. They will pull the factory stereo out and splice/plug in an output wire that you can plug your iPod into.
stepper motor in the rear unit is not working, it is the blend door actuator for the rear climate control AIR TEMPERATURE ACTUATOR REPLACEMENT - AUXILIARY
REMOVAL PROCEDURE
1. Remove the right rear quarter trim panel. 2. Disconnect the electrical connector from the auxiliary air temperature actuator. 3. Remove the retaining screws from the auxiliary air temperature actuator. 4. Remove the auxiliary air temperature actuator (1) from the rear auxiliary HVAC module.
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