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Old 02-22-2012, 03:07 PM   #1
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Test Blower Motor

I have a 2002 TJ. My blower motor use to work on only high. Now it does not work at all. Turning the three knobs does nothing. I have replaced the resistor pack and the blower motor switch and neither has resulted in a change.
I have a multimeter. If I wanted to check and see if power was making it to the switch what do I need to look at on the switch harness? I also want to test the blower on its own. If I want to run it directly to the battery, what type of wire should I use and where do I need to plug it into the harness?

Thanks

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Old 02-22-2012, 03:18 PM   #2
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Having just gone through the "blower motor thing" with my 2000 TJ, I suggest you next check the connector at the blower motor which I believe, like mine, is behind the battery. Remove the battery and the module behind the battery and you will see the blower motor. The plug is on the right and you might try wiggling it with the motor on and see what happens.
If nothing happens you can pull the blower motor, three screws and jump 12 volts to the motor - black is ground - to see if it runs. You might also tap on the motor to see if it will start and if it does might indicate bad windings in the motor.
All of this does not allay the possibility of melted wires at the climate control module (which I also had).
Also, the connector to my motor was corroded, I cleaned it yet it still ran on high once so I cleaned it again. Running fine since then.
And, if you want to replace the plug the same blower motor is in a 97-07 Cherokee so if you have access to a bone yard you can get a connector to splice in. I picked up one in case my motor acts up again.
Hope this helps.

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Old 02-22-2012, 04:58 PM   #3
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Check the ground wire plugs on the back side of the HVAC control in the dash (on the outside closest to the vent vacuum hoses) to ensure they didn't come loose when you installed the new blower setting switch or aren't melted (like mine were).

Herbc gave pretty good instructions on how to check the blower motor. It is actually very easy (I didn't even have to remove my battery). The plug can go bad or the motor can go bad. Neither is too expensive to replace but the plug will be more of a PIA to replace.
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Old 02-23-2012, 02:27 PM   #4
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Understand that on the 2002s the the relay sends power to the blower motor. The rest of the circuit is the grounding side of the motor. That means the resistor & switches are on the ground side that controls the on-off & speed of the motor. Access to the relay & blower is from under the dash on the passenger side. Make sure you have power to the dark green wire from the relay to the motor (key on). Then you can ground the other wire from the motor that goes to the resistor it should be black or black/tan. The motor should run. From there it is a matter of following the ground path through the connectors & switches to ground. On hi you by-pass the resistor so you can skip that for now. Set the fan switch to hi & the mode switch to any position except off. The bk/tn wire goes to the speed sw & a dark green wire to the mode sw & next to that a black wire goes to ground. Test each of these to see if they are grounded with the switches set as stated. If you don't have power at the motor or relay check the 8 fuse in the fuse block behind the glove box & the 1 fuse in the PDC in front of the battery.
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