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Power window control problem


cadave

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I have a 2003 Deville with only 25,000 miles and the car is immaculate. Lately, when I press the front drivers side window down button, both the front drivers side and the passenger side windows go down. Pressing the up button and both windows go up at the same time. Additionally, the front passenger side window switch does not operate. I purchased and installed a new drivers side switch and it still acts the same. What's the problem?

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First, please run the OBD codes and post them here. That will likely tell the story.

I don't have a FSM for the 2003 model year. My 1997 FSM has a schematic on page 8A-120-0 and facing page that shows how all the power window switches work in the 1997 model year and the problem you are reporting is not possible according to that schematic because of the way the switches are hooked up. In the 1997 model year, the RF power window motor is hooked directly to the switch, the DK BLU and BRN wires, and the window is run up and down by applying voltage to one terminal and ground to the other. The two switches can conflict but the LF switch cannot interfere with the RF window circuits according to this schematic.

If the RF window does respond to the switches on the driver's side but not the switch on the passenger side, check for voltage on the PNK wire (terminal F on the power window switch in the 1997 schematic). It should be hot with the key on. Thye LT BLU anf TAN wires on terminals D and H of the switch on the passenger's side should be ground when the driver's side switch isn't being touched.

Anyone with a schematic of the power windows on a 2003 Deville?

CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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wow now that is a first. I have never heard of this one. My first guess would be the master window switch, but if you replaced that already then I am completely lost

GM FAN FOREVER

Nice, clean, luxury= fine automobile

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If it's impossible according to the schematic, there is a short in the wiring harness.

CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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  • 3 weeks later...

I finally took the car into a GM dealer and you will not believe what fixed the problem! After the tech worked on the car for 4 hours, he called A GM specialist and with no success. One of the other techs at the GM dealer where I took the car came over and asked what the big problem was. After explaining the issue to him he said "why don't you disconnet the battery terminals and touch the cables together for a few seconds" SHAZAM! This fixed the problem! I don't know why this worked but my windows work perfectly now as they should. Go figure!

If anyone has this problem try it! What have you got to lose?

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That totally resets all the modules in the car. So, it was a software problem. Your car apparently has a module for the door, and it grounds relay coils to open and close windows.

CTS-V_LateralGs_6-2018_tiny.jpg
-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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Newer Cadillacs no longer use hard-wired DC circuitry to exclusively control the window motors. Even window problems now require a call to "Geek Central."

For anyone interested, here is a partial explanation of how the window circuitry does its stuff...

*****************************

Power Windows System Components

The following components are used to control the power windows:

  • Driver door module (DDM)
  • Front passenger door module (PDM)
  • LH rear door module (LRDM)
  • RH rear door module (RRDM)
  • Driver door switch assembly (DDSA)
  • RH front power window switch
  • LH rear power window switch
  • RH rear power window switch
  • LH front power window motor
  • RH front power window motor
  • LH rear power window motor
  • RH rear power window motor
  • Class 2 serial data circuit
  • PWR WDO 30-amp circuit breaker
  • DRVR MDL 10-amp fuse -- DDSA and DDM logic, DDM internal driver operation.
  • PASS MDL 10-amp fuse -- PDM logic and internal driver operation.
  • RRDR MDL 10-amp fuse -- LRDM and RRDM logic and internal driver operation.

Power Windows Operation

The vehicle is equipped with power windows controlled by the door modules. Each passenger door window can be operated, either from a power window switch built into the driver door switch assembly (DDSA), or, from a power window switch mounted locally to the associated door. The driver door window can be operated only from the driver door power window switch built into the DDSA.

When the driver door window is operated, the DDSA interprets the switch request and sends it to the DDM. The DDM examines the request and checks to see if it has received any class 2 serial data messages from any of the other vehicle modules prohibiting the movement. If no prohibitive messages have been received, the DDM applies battery voltage and ground to the driver door window motor to move the window as requested.

When a passenger door module, PDM, LRDM, or RRDM, receives a window switch request from, either the DDSA, or the window switch mounted locally to its door, the passenger door module examines the request and checks to see if it has received any messages from any of the other vehicle modules prohibiting the movement. If no prohibitive messages have been received, the passenger door module applies battery voltage and ground to the associated window motor to move the window as requested.

*****************************

Regards,

Warren

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There is no means of avoiding the final collapse of a boom brought about by credit expansion. The alternative is only whether the crisis should come sooner as the result of a voluntary abandonment of further credit expansion, or later as a final and total catastrophe of the currency system involved. - Ludwig von Mises

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  • 2 weeks later...

Thanks Warren. You obviously know a lot about the window circuits on the Deville. Your explanation of the control logic is very helpful. I'm curious why this happened in the first place? Any ideas? By the way, I think you can write a book on the workings of the electrics on a Cadillac! Thanks again.

Dave

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Thanks Warren. You obviously know a lot about the window circuits on the Deville. Your explanation of the control logic is very helpful. I'm curious why this happened in the first place? Any ideas? By the way, I think you can write a book on the workings of the electrics on a Cadillac! Thanks again.

Dave

Thanks for the compliment Dave, but I can't take credit. That text was lifted directly from your Service Manual.

Regards,

Warren

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There is no means of avoiding the final collapse of a boom brought about by credit expansion. The alternative is only whether the crisis should come sooner as the result of a voluntary abandonment of further credit expansion, or later as a final and total catastrophe of the currency system involved. - Ludwig von Mises

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  • 7 months later...

wow now that is a first. I have never heard of this one. My first guess would be the master window switch, but if you replaced that already then I am completely lost

[/quote

My driver side window switch was replaced new last year when the window went down and I couldn't get it up. The new one cost $332.00 and it worked fine for 7o months or so. Now it goes down and stays down every once in awhile. In order for it to go back up, I have to lower the passenger window and raise it before the drivers side window goes back up. Sometimes the drivers side will go up as usual but the other times, I have to roll the passenger one up and down as many as 4 times before the drivers side window goes all the way up. I then bought a used one from a salvage yard and put it in and it worked fine ---- for a couple of weeks and then when I put it down it would not come up no matter what I did. I then took the switch that I had removed and put it back in and then rolled the passenger window down and back up and then the drivers side window went all the way up. All of this was done from the drivers side switch and not the passenger side switch. I won't buy another switch as the problem is elsewhere and I am assuming a common ground wire for the two front windows but I don't know.

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