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Old 02-16-2016, 06:37 PM
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Power Window Switch operation

I do have a specific problem - 2004 4.7 HO
Left rear window goes down with it's switch, but not up.
No control at all from driver's panel.
No other issues.

I have the full shop manual and referring to page 8W-60-4 I am wondering about the theory of operation. It seems that both circuits Q24 and Q14 must be hot coming from the Driver Door Module. Or they reverse polarity and complete there own circuit without using the rear window switch ground.

But when looking at the Driver Rear Power Window Switch block, flipping either up or down seems to go to ground and breaks the circuit through the motor.

So what is the exact theory of operation that permits control from the Driver Panel and the Rear Door Switch?

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Old 02-16-2016, 08:34 PM
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Re: Power Window Switch operation

Welcome to the garage.
Unfortunately you canīt see what is happening inside the door modules. But switching the rear drivers window from the driver door module, means that one side will get the power and the other side the ground, from the DDM.
But when using the rear door switch itself, it seems that the door switch contacts are shown wrongly. Or the window motor is switched to the DDM driver (with rear door switch relaxed), or it is switched to ground (with the rear door switch actuated).
I have never measured it myself, but i imagine that there is power on both circuits Q14 and Q24 when no switch is touched. Touching the rear door switch, should break one of the power supplies and put that side to ground. Switching to the other side will break the other power supply and put that side to ground. When switching from the DDM, internally the power from one side will be removed and ground supplied to make the circuit complete.
That the window goes down from the rear door switch, but doesnīt go up, AND that nothing works from the DDM, i would say that the Q24 circuit is open between the DDM and the rear door switch. I would have a look inside the drivers door rubber boot for a broken wire. If all seems to be ok, i would measure continuity between pin 4 from the rear door switch and pin 2 of connector C1 on the DDM.
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Old 02-17-2016, 07:28 AM
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Re: Power Window Switch operation

Thank you for the quick response.
I concur, with the Rear Switch relaxed, the DDM provides ground and power when operated from Driver's Panel when the rear window is operated - you can hear the relay in the DDM.

I also concur that the drawing MUST be in error as both Q24 and Q14 MUST be power thus the arrows should be reversed making the Q23 or Q24 the culprit.

In the driver boot, the E21 rear switch illumination wire is broken in half. and there are the 'normal' suspicious kinks in both the Q13 and Q23 - the Q23 conductor must be broken within the wire.

This explains why neither up or down from the Driver's Panel fail to operate.
Now with someone else confirming the drawing error, I will proceed with testing.

Full understanding of why a supposed anomaly occurs is always enlightening.
"how could it not work either way at the Driver's Panel, but go up at the rear switch"

Thanks again.
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