Non-working front passenger side power window switch

KRASSIMIR STOICHEV

MEMBER
2008 CADILLAC ESCALADE
6.2L
V8
2WD
AUTOMATIC
152,000 MILES

Hi,

I am trying to diagnose a non-working front passenger side power window switch on the vehicle listed above. Only the lock/unlock function works. The window, mirror and mirror turn signal do not. The window and mirror do not work from the driver's console either. The mirror turn signal does not work at all.

Here is what I know so far:

* The switch has input sockets for eight color-coded connectors (or seven but I think they are eight, I am not with the vehicle right now to count them). Exactly three connectors which should be hooked up to the console are missing - the blue, green and grey.
* The board looks okay inside.
* The window motor works - tested with bypass straight from the battery.
* The passenger door module 15-amp fuse (on fuse panel left of dash) is good.
* The passenger door module 25-amp circuit braker (on panel under dash) is good; it was also taken out for two minutes and put back in, as well as replaced with the spare - all with no effect.

Question one: Are some of the connectors optional depending on the model or am I missing three that should be there?
Question two: What else should I do to diagnose this myself?

I just bought the vehicle so I have no history of its behavior. What is worse, I am based in Europe where there are no shops for these cars.

Please assist. Thank you.

4 Replies

MHPAUTOS

MECHANIC
31,937 POSTS

Have you check for broke or frayed wires in the flexi loom between the door and the pillar, you often get a problem here.

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Tuesday, March 20th, 2018 AT 12:41 AM

KRASSIMIR STOICHEV

MEMBER
6 POSTS

A recap of this issue now that it is solved.

1. I checked the rubber boot between the door and the body - all wires inside looked intact, nothing chewed up.
2. I checked the voltage entering the power window switch - it was there and a correct 14V. The current goes into the big black connector and it is the only thing that goes INTO the switch. Everything else goes out of it.
3. With the correct current available, I asked a buddy with a 2009 Escalade to let me borrow his switch to test with, already knowing that my system wouldn't damage it. His switch also had 7 connector sockets, only 4 of which were connected, just like in mine.
4. I connected his switch in place of mine and everything worked as it should.

So the diagnose now is a faulty power window switch - already ordered and on its way.

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Tuesday, March 27th, 2018 AT 2:35 PM

KRASSIMIR STOICHEV

MEMBER
6 POSTS

What I learned along the way - for those who might encounter the same symptoms in the future:

The switch is an integrated module (a computer by itself, integrated with the driver's switch) but all functions in it are independent of one another. This means that if you disconnect one connector, the other functions would still work if the switch is healthy and the power input is connected. However, if the switch is faulty or a connector is disconnected, the corresponding function will not work even from the driver's switch. Basically, the front passenger side power window switch dispatches the functions to the front passenger door.

* The big black connector (the one that is off the row of the other six) is the power input for the whole switch, as well as the output for the power window
* The small black connector and the white one are for the power mirror
* The brown connector is for the power locks
* The blue, green and grey connectors are for options I don't have on my car.

I hope that's helpful. Thanks and good luck.

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Tuesday, March 27th, 2018 AT 2:36 PM

MHPAUTOS