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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 .
What are you using to test this control signal ? Were you on right wire ?
Blower Motor Control Processor
The blower motor control processor is an interface between the HVAC control module and the blower motor. The blower motor speed control, battery positive voltage and ground circuits enable the control processor to operate. The HVAC control module provides a pulse width modulation (PWM) signal to the control processor in order to command the blower motor speed. The processor supplies 12 volts to the blower motor through the blower motor voltage supply circuit. The control processor uses the blower motor ground as a low side control to adjust the blower motor speed.
Chevy Trailblazer EXT Blower Motor Won Turn Off The blower motor in this video don't shut off , but he show's how to test the PWM signal right !
Your blower motor control module is probably bad , or HVAC control panel is bad , or a wiring problem !
Electronic climate control power module . Don't know what relay you replaced because this vehicle has no blower motor relay .1990 Cadillac DeVille Power Module
4504204 a/c blows fuses ive had feron checked replaced a/c relay fuse last about 10 ... I have a 2006 impala that is blowing the 10 amp fuse to the ac/compressor/a new will last ... 93 corolla 1.8 No start Blown ignition fuse ... i have a cadillac deville the a c blows hot air on ... air con fuses air con heating mk3 mondeo talkford.
? 4:22
https://www.youtube.com/watch?v=2vmfxYg8LoY
Sep 27, 2009 - Uploaded by mgittelman
I have a 1996 Cadillac DeVille that the blower motor stays on unless you unplug it. ... +mgittelman hi mate ...
Nov 3, 2006 - 91 Fleetwood "check engine" light, 10/31/2006, Tom Joy ... Q: My 95 Deville blows air when the heat is on, but the air never warms. ... 96 Deville Interrior Lights Inoperative & 3.2 Amp Draw on Body Fuse 3. ... Q: I have the 93 cadillac deville and those codes came up right after a transmission replace.
The BLOWER MODULE is located on the A/C EVAPORATOR housing located UNDER THE HOOD passenger side firewall. Has 2 electrical connectors. Mounted with 4 screw bolts.Hope this helps
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