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Old 09-12-2016, 04:30 AM   #1
Philthfc
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Default Window drop.

I've got an intermittent issue with the window drop on the drivers door not automatically returning up sometimes. The switches all work ok. Is there an adjustment procedure or a component likely to play up?
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Old 09-12-2016, 12:15 PM   #2
scratchedeos
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Mine has done that for years - never found a solution. May be a "Perth" problem!
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Old 09-12-2016, 01:20 PM   #3
voxmagna
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The window drops by an amount determined by a set number of pulses sent to the regulator motor. It rises and stops at the roof seal, determined by an equal number of pulses AND pressure and torque stall current on the motor.

The glass heights and levels are adjustable through small holes in the bottom of each front door (when the glass is at the lowest 'service position'). First thing to try is open the door and raise the glass as high as it will go. Then check that that height would reach the roof seal or just higher and is NOT lower than the roof seal.

If the glass doesn't reach the seal then 2 things could be happening.

1. The window motor is torque limiting due to excessive tension or binding on the regulator wire. The front window motor currents for a new regulator are about 8.5A up and 2A down before they stop. If the motor currents on Up are going way over this, it suggests the regulator wire tension is too high or there is binding and impending failure. One possibility is there is too much friction caused by front channel seal near the mirror and the long wiper blade seals. I add a small amount of Krytox to the front seal to help the glass move more easily with less strain on the motors and regulator wire. I don't mind if a little bit of Krytox shows on the glass. You can clean it off with alcohol wipes. You can't do much with the long horizontal blade seals, except carefully lift the blades back and clean off green stuff along the edges with a bud and detergent.

2. If the above test is o.k and the motor is not struggling causing torque limiting, the issue could be the lift height needs adjusting. Obviously you have to exclude 1. first before adjusting anything and get in a mess loop.

Another issue is a loose sagging regulator wire. If there is insufficient tension on the wire the window drop will be much less than normal 20mm or so as the motor first takes up the slack. When the glass is raised to the seal it will not stay there and you can confirm this by trying to push the glass down with the flat of your hand. If it moves down easily leaving a gap to the roof seal there is insufficient tension on the regulator wire and a sign of future problems and leaks.

The top edge of the glasses should contact the roof seal all the way along and with a little pressure, which you can check by sliding thin paper along after trying to push the glass down to take out any slack. You do this because you might think the top of the glass is sealed but after a short drive along a bumpy road, the glasses move back from the seal.

If you don't get a seal across the top of the window glasses, water falling on the roof can run inside on your passengers knees, or get inside the door frame.

Last edited by voxmagna; 09-12-2016 at 01:30 PM.
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Old 11-22-2016, 08:38 AM   #4
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Turned out to be the battery. Has been fine since I replaced it last week. Thanks for the advice anyway.
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