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73-87 Chevy _ GMC Trucks => Interior & Equipment => Power Windows & Door Locks => Topic started by: cbwallace30 on June 24, 2013, 12:33:30 pm

Title: 1985 GMC Sierra Classic and both power windows don't work!
Post by: cbwallace30 on June 24, 2013, 12:33:30 pm

Hi,

I bought my 1985 GMC Sierra Classic used.  Both power windows do not work.  When I press the switch on the driver's door I don't hear anything like a motor, engage.  I have already replaced the switch and checked my fuses.  The guy that I bought it from told me there is "module" further down in the door that needs to be replaced.  I am newbie and I thought the module he was referring to WAS the switch.  Since both power windows don't work, I'm thinking that this is an electrical problem that's prohibiting electrical current getting to the appropriate device.

Do I need to take the door off?  What do I need to look for?  My power locks work fine.   Please be as detailed as possible because I'm a newbie when it comes to things like this.

Thanks, Craig

Title: Re: 1985 GMC Sierra Classic and both power windows don't work!
Post by: cbwallace30 on June 25, 2013, 11:56:28 am

This thread has been viewed 17 times.  Anybody?

Title: Re: 1985 GMC Sierra Classic and both power windows don't work!
Post by: rich weyand on June 25, 2013, 12:16:10 pm

Electrical problems are almost always connectors or grounds.  Here's the diagram:
http://www.73-87chevytrucks.com/techinfo/wiring_diagrams/powerwindows.gif

Pull the drivers door panel.  Check for power (with a voltmeter on "volts dc" to ground) on the PINK wire at the window switch; you should get battery voltage, 13.2 volts).  Then check for ground (with a voltmeter on "ohms" to ground) on the BLK wire at the window switch; you should get low ohms (0-5).  That's first thing.

Title: Re: 1985 GMC Sierra Classic and both power windows don't work!
Post by: ehjorten on June 25, 2013, 01:48:31 pm

There is a relay under the dash for the power windows.  You might want to investigate that.

Title: Re: 1985 GMC Sierra Classic and both power windows don't work!
Post by: cbwallace30 on June 25, 2013, 05:33:53 pm

I saw the power window fuse and I replaced it.  Is a relay something else?  Can you tell me what it looks like?

Title: Re: 1985 GMC Sierra Classic and both power windows don't work!
Post by: rich weyand on June 25, 2013, 05:53:28 pm

Google this, lots of good stuff: 1985 chevy truck power window relay

Title: Re: 1985 GMC Sierra Classic and both power windows don't work!
Post by: cbwallace30 on June 25, 2013, 09:26:11 pm

Okay.  Thank you

Title: Re: 1985 GMC Sierra Classic and both power windows don't work!
Post by: Irish_Alley on June 25, 2013, 11:02:49 pm

are you getting power to the switch?

Title: Re: 1985 GMC Sierra Classic and both power windows don't work!
Post by: cbwallace30 on June 25, 2013, 11:57:40 pm

No.  No power to the switch.  The passenger side won't roll down either.  I don't even here the motor kicking in. 

Title: Re: 1985 GMC Sierra Classic and both power windows don't work!
Post by: Irish_Alley on June 26, 2013, 12:38:13 am

not sure but i dont think there is a relay for the window just for the locks. and the diagram posted above doesnt show one for the windows so that kind of backs this up. so check your wires follow them from the switch to the dash make sure you have power at the dash also. check for broken wires. was your window fuses blown?

Title: Re: 1985 GMC Sierra Classic and both power windows don't work!
Post by: Irish_Alley on June 26, 2013, 12:42:58 am

http://forum.73-87chevytrucks.com/smforum/index.php?topic=20550.0