My blower motor was not working on any speed. I got it working, however it keeps working even when the ignition is off and key out.
To get it working, I shorted across the contacts (inside the relay housing) 4/1. (*- See wiring diagram link below) This made the blower work on all 4 speeds. Before I did this, I also checked the relay, and it worked. (Didn't expect that.) So, I measured the voltage across the relay socket, 5/2 zero volts, okay, may .5 volts. I then measured 5-ground; and 2- ground. Again, maybe .5 volts (with the ignition on, and the a/c heat control NOT off.
So, while it works, the only way you can turn the blower motor off is the a/c heater control to off. If you leave it on any other settings (NOT Off), even with the key out, the blower motor stays on one of the four power settings.
So: I know the motor works, the relay (used to work, now shorted contact), the resister bank works and the blower motor control all work. Yet, I'm not getting 12vdc to the blower motor relay coil.
My question: where should I be looking for a problem?
* 2001 Jeep Wrangler Blower Motor Wiring Diagram: http://www.justanswer.com/jeep/2l2v3...not-start.html