Quote:
Originally Posted by brcidd
It's always best to look at the wiring diagram to answer your questions--I just did....The blower motor relay and resistor block are all in the same component-- if you replace one, you relace both-- the relay is only active when blower motor high speed is requested. The resistor block handles all the lower speeds.
You have clearly indicated that when blower motor dies, it does NOT work on ANY speed-- this would rule out the blower motor relay and resistor block as the culprit.
The easiest diagnosis is to test voltage across the blower motor leads while it is plugged in and after it is unplugged- if you get system voltage, then you know the blower is inop.
Blower motor is easy to access- remove passenger side hush panel (under glove box) and then unplug blower motor, and remove the 3 mounting screws (5.5mm)
The clicking you hear may be a faulty actuator- does it do it at every key on? does it last for the same amount of time? You may have a recirc door actuator that is broke, try different modes, see if you hear clicking on any particular mode position request.
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Good call, the version of Alldata I'm using has it listed as two separate units in service and repair as a relay and a resistor. Now that I look at the wiring diagram it lists the two in the Blower Motor Resistor Assembly. It also shows that high speed is controlled through the resistor relay coil side. It still could be the relay, which just happens to be the all in one unit, and seeing how this component is subject to lots of moisture, it would be a starting point.
Also just to clarify what was said above, measuring voltage at the motor connector while unplugged will give open circuit voltage (battey voltage), but while plugged in, it would be a voltage drop test. If your measuring voltage at the connector while plugged in, you should see source voltage as the load (blower motor) should be using all the voltage in said circuit. If you see source voltage and the motor is not working, then you can rule that to be the bad component.
Here's the wiring diagram in case you want it for reference.