2003 Chrysler Town and Country Van came in with the complaint of the blower operates on high speed with key on and cannot be adjusted down. This procedure will also apply to Dodge Caravans with auto a/c. The controls and indicators seemed to work normally. I checked the wiring diagram and component locator and found that the blower power module is located behind the glove box. Good place to start.
After opening the glove box there are two stops the have to be depressed inward in order to drop the box down.
The blower power module is directly behind the lowered glove box. It is held in place by two 8mm hex head screws.
After removing the two attaching screws, the blower power module can be positioned for testing.
Turn the key on and while manually rotating the blower switch from low to high you should see a voltage change between about 2 volts (high)up to about 10 volts (low) on the blue/light blue wire. It is the middle wire in the left connector pictured below. Because the blower was working on high speed there was no need to do any other testing, however if you were to have low blower or no blower you would need to test further. Check for 12 volts – on the black/orange wire and 12 volts+ on the dark blue wire in the three wire connector. If either is missing check respective fuse and ground connections. Next check for 12 volts between the blue wire and the dark blue /yellow (sometimes black as pictured below) wire in the two wire connector to the right of the pictures. If either signal is missing in the two wire connector and the three wire connector tested good then the power module is faulty. If 12 volts power and ground are present then the blower motor is faulty. Usually bumping the motor with the key on and the blower switch on high will make the motor work for a little while because it will reset the worn brushes.
Three wire connector:
Black/Orange wire should have a constant ground.
Dark Blue wire should have 12 volt switched power from the front blower relay. The front blower relay is located in the Integrated Power Module (underhood fuse box).
Blue/Light Blue wire should have a varying voltage from about 2 volts(high blower command) and a nominal 10 volts(low blower command).
Two wire connector:
Check for a nominal battery voltage reading across the two wires. Key on and blower set to high.
I removed the mounting screws to gain better access to the wiring for testing.
Be careful to keep the aluminum cooling fins away from the metal brace for the glove box. It will complete the ground circuit for the blower motor and will scare you when it sparks.
Place an insulating cloth between the aluminum fins and the brace if you want.
A good look at the blower power module.
Installed the new blower power module and all is well.
Sparky, I didn’t see my particular condition, so I thought I’d post. I hope that’s okay as you’ve answered so many times!
2001 T&C with ATC. Blower adjustment doesn’t change blower speed, although it did work for maybe 10 seconds while testing. Over months, it’s been gradually going toward not having control. One other note, the stereo/radio system completely goes dead once in a while, and it also had no power for a moment during testing. Not sure if it’s more likely a cold solder joint or maybe there’s a bad ground somewhere?
3pin Black/orange to gnd: .12V
Blue/light blue to gnd: 8.6V to 2.5V
Blue: 11.2V
2pin Blue to black: 7.0V
Think I should get a new blower power module?
Thanks so much!
No, it only controls the blower motor.
I replaced my blower motor and did a recalibration test on the 2005 T and C. Now the fresh air door actuator does not appear to be moving. 🙁 Does the power module work that too?
I would need to see your actual voltage test results to give you an answer. However if you were to read through all of the comments you should see that others have had the same results with after market parts on this system. If I remember correctly all were finally repaired using genuine Mopar parts from the dealership. You may also want to consider that the blower motor may be drawing too much current and should also be replaced. A long shot would be that the heatsink could be grounding out on something when it is installed.
Great site Sparky. I have a 03 Town and Country with auto controls. I got in the van and started it up and the blower wouldn’t shut off (so I know the blower motor is good) except when I shut the van off. I read your posts and did all the voltage checks and everything checked out good. I replaced the control module and everything worked good for about a week then the blower wouldn’t shut off again. I contacted Rock Auto, the site I ordered the part from, and they sent me out another module. I installed it and again it worked but this time for only 1 day. Do you think I could have gotten 2 bad parts? I have swapped the front and rear blower relays and that makes no changes.