Ok here's what I found. When I pulled the power cable on the blower motor and applied 12vdc across the connectors the motor turns on. Checking the disconnected cable coming into the blower I see:
- switch position off = 0 volts
- sw1 = 5 volts
- sw2 = 5 volts
- sw3 = 5 volts
- sw4 = 5 volts
No change in voltage between switch positions 1 thru 4.
I don't have a schematic of the system so I'm flying blind, but I went back and pulled the connector to the switch and found 5 volts across all the wires except for one. I kinda of stopped here because I don't know exactly what kind of relays and various electronic signals influence the lines running the motor. New cars use thermistors or relays switched by duct position, or voltage controlled by load, etc. It can be tough to figure what what's going on.
Without a schematic what do you recommend I do now?
Saturday, December 11th, 2010 AT 6:10 PM