Rear window not working

THEDARKKNIGHT1

MEMBER
2007 ACURA MDX
3.7L
6 CYL
AWD
AUTOMATIC
100,000 MILES

My wife went to roll down both rear windows from the driver's master switch and they will not roll down. When she depresses the buttons for the rear windows, she hears a clicking noise and nothing happens. I check the fuses in the fuse box by the driver's kick panel and they all seemed good. I do not know if there are other fuses or relays I can check. I think it may be electrical because neither of the window buttons in the rear doors are lit at night. What other fuses or relays can I check/change to get the windows working again and where are there locations? Also important is the fact that they were working a few days ago and just quit.

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HMAC300

MECHANIC
48,601 POSTS

Pic shows all fuses for windows it may be a mcs unit in switch so have it scanned for codes a pro will have to do it. Also check ground behind left kick panel. It may be the relay and fuse 24&25 as they supply to rear.

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Thursday, March 12th, 2015 AT 5:53 AM

THEDARKKNIGHT1

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"it may be a mcs unit in switch so have it scanned for codes a pro will have to do it"

What is an "MCS unit" and which switch are you referring to? The master switch?

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Thursday, March 12th, 2015 AT 7:07 AM

HMAC300

MECHANIC
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There are two mcs units one in master switch as well as passenger side front door. You could check the fuses I mentioned which in the diagram points them out. I kind of doubt it's the relay however due to the front windows working. However you can try to do a reset and that may make the rear windows work. See pics. It's important in step 4 to do within 5 seconds of each other.

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Thursday, March 12th, 2015 AT 8:14 AM

THEDARKKNIGHT1

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5 POSTS

Okay,

I checked the fuses and they were good. I ran the reset procedure and was able to confirm the procedure did reset the switch. I still get a clicking noise from both rear doors and the windows still do not work, what's next?

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Thursday, March 12th, 2015 AT 2:45 PM

HMAC300

MECHANIC
48,601 POSTS

The only thing I can think of is that either the cable has broken in the rear windows or the clips that hold the window to go up and down have broken but you need to pull the door panel off to look and see this. Pic shows drawing. There is a tsb on this- service bulletin 10-1014 and it deals with window tinting causing part of the problem but eh door panel has to be removed and see if channels are pinched so you can watch what is happening. I can't copy the whole thing on what to do so it will come in several pics. The grease listed is p/n 08798-9013 but that is a dealer part and I'm sure it will cost a bundle you can try a good spray white lithium grease at auto parts.

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Thursday, March 12th, 2015 AT 3:53 PM

DAN DAVIE

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2 POSTS

Hello! I have the exact same problem. Fuses seem fine, did you ever find an answer? Thanks! - Dan

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Tuesday, April 18th, 2017 AT 5:32 PM

KEN L

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48,363 POSTS

Hello,

They never got back to us on the fix but nine times out of ten on this kind of problem it the main switch. What happens is the contacts get worn and stop working correctly. Here is a full wiring diagram and a couple of guides to help you get the problem fixed.

https://www.2carpros.com/articles/electric-window-repair

and

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please run some tests and get back to us.

Best, Ken

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Saturday, April 22nd, 2017 AT 10:34 AM

DAN DAVIE

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2 POSTS

Problem solved! It was the wiring harness that goes between the car body and out to the driver door. Easy fast fix and only about 30 bucks.

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Saturday, April 22nd, 2017 AT 10:54 AM

KEN L

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Great addition to this thread! Please feel free to help out on the site whenever it can add information that will help.

Cheers, Ken

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Saturday, April 22nd, 2017 AT 10:59 AM

RAIN5512

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2007 Acura mdx rear power windows only go up and and down when drivers doors is open. And will not work when drivers door is closed. How to fix?

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Friday, June 7th, 2019 AT 5:48 PM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

It sounds like the driver door MPCS is out and needs to be replaced. Here is the location and instructions on how to test and replace it. You will need to remove the drivers door panel. Check out the diagrams below.

Driver's MPCS Unit Input Test
1. Turn the ignition switch OFF.
2. Remove the driver's door panel.

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3. Disconnect the driver's MPCS unit (A) connectors A (40P) and B (14P).
4. Inspect the connector and socket terminals to be sure they are all making good contact.
- If the terminals are bent, loose or corroded, repair them as necessary and recheck the system.
- If the terminals look OK, Go to step 5.

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5. With the connector still disconnected, make these input tests at the connector.
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, Go to step 6.

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6. Reconnect the connector, and make these input tests at the connector.
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, replace the driver's MPCS unit, then go to step 7.

7. Reset the power window control unit.

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