so yesterday I was driving with the windows down. Got home put the truck in part and went to roll the windows up. Nothing happens. Neither driver or passenger will roll up.

No previous signs of the motor/s going bad. Work fine all morning.

I check the big 30 fuse in the engine compartment. It was no blown.

I got a relay from the parts store since that is my next guess. Where is the relay located for the power windows?

This is on a 97 F150 XLT 4x4 extended cab.

All I found in the owners manual was the big fuse but nothing else where to find the relay or other fuses.

I hope someone can point me in the right direction to get this fixed today.

Thanks,
Andy

 

any hints at all how to diagnose this issue or where to look next?

 

There is no relay for the window function, the relay is for the OTD function only.


When you checked the power, you only visually viewed the 30 A fuse ?

Once thing to do, to make sure the Accy Delay relay is working, is to measure for power at the power input of the driver's side switch.
This is the black w/ light blue stripe wire into the driver's side switch


This is a good place to check, and remember the key needs to be in the accy or run position when checking for power from the accy delay relay

 

I have 99 f150 My master switch was broken I have yet to find a rep at a junk yard anf ford wants 110 for a new master switch

 

What cab do you have ( your profile is not completed with this info ).

A quick look at www.oemfordparts.com a 1999 power window switch driver's side is 72.82 + S/H, MSRP is $101.98. You dealer is charging you list plus shipping for it.

Mechanical Catalog -> Electrical -> Body Electrical -> Door -> interior Trim.

 

so today for some reason the windows worked. Something told me to try them and I did and both passenger and driver side windows went up and down.

I still have yet to test the current going to the switch, but thought this was really weird.

So either it really is the GEM acting up or just wiring being cracked or loose.
I'll have to see if I can track down what really is the cause.

It started to get really cold last friday and We ran the heather in the truck saturday and this morning a lot....specially the feet.

I dont think its the ground wire because the buttons light up and power locks / mirrors work fine.

I'll report back if I find out what really caused it....or after getting a signal reading.

Thoughts?
Thanks!

 

did it rain and the switches got wet?

 

no the switches did not get wet.....but just to rule those our, I replaced the switches with some from the salvage yard. I guess those could have been bad too.

 

You are a great resource. I have a 99 and have this problem, sorta. My problem comes and goes. In the morning my windows, interior lights, radio do do not work. Then I am driving down the road and the radio comes on.

This ruled out fuse for me, {I think anyway}. I am an electrical engineer so I do understand things can happen in different levels of heat and humidity. I was thinking in my case a master ground is probably coming loose. The ground for the relay is what I am thinking too. But how do you find these places? The Chilton Manual that I have is a total POS. I have not gotten one good piece of information out of that book in almost 10 years.

Anyway, rant over, if you know how to locate things like above I would be pretty happy. Thanks

 

The items that stuck out for your case is the Radio and interior lamps.
In '99 ( if memory serves me correctly ) the Radio was not an accessory delay item ( shut the key off, and the radio turns off ) .The radio has inputs from Fuses 20, 1, and 8 in the Central Junction box ( cab fuse panel ).
The interior lamps are not on the accy delay relay, but are on the battery saver relay and the interior lamps relay. These 2 relays along with the accy delay relay are controlled by the GEM.

Have you had a bit of rain while this is happening ( or just before it happens ) ?

This body style has an on again, off again problem with the windshield not being sealed correctly on the lower left hand corner ( driver's side ) and leaking water in to the GEM / Central junction box area.

Take a feel up behind the central junction box ( along the firewall at the end of the carpet ) to look for signs of water damage ( rusting behind the carpet, water marks along the GEM / central junction box.

The GEM is attached to the back of the central junction box, and if it gets water damage, the plug in from the CJB to the GEM get corroded and looses a good power connection, causing strange behaviors. A search in this forum for the term GEM produces 441 threads.

Might be a place to start looking for water damage, prior to tearing into the CJB / GEM to take then apart.

 

SSCULLY,

So I took my voltmeter out there today....I'm not sure I was doing the testing right, so here is what I did.

I removed the panes and just had the switch hanging there. From the volt meter used the red and placed it into the second pin on the harnes and put the black in the 3rd pin on the harness. I got no reading when selecting the ohm on the volt meter. It's the horse shoe looking thing correct? it displays 0.L on any of the positions.

For some reason the power windows started working again. All I did was mess with the relays under the oval last week to see if any of those relays were bad. I switched them all around to see if that would change anything and it didn't but no the windows work.

The wire that goes from the TCM into the transfer case, I put the volmeter to it to see if any signal is goind through it when I select 4H and I didn't see any ohm reading either.

I'll call the dealer ship tomorrow to make sure I have the right switch since I remember there being multiple options when he was looking it up. I doubt that's the issue but I guess it could be.

If you can, can you give me some detailed directions on how to test everything you mentioned. Thanks for the help. I wasn't really sure what you ment by pin 2 to 3, figured you were talking about the wires going into the harnes on the 4x4 switch.

Thanks,
Andy

 

mine did