Parts Catalog Accessories Catalog Tech Info Tech Forums
 
  Search our site:    
 Cart  | Project List | Order Status | Help    
  We salute a legendary member of the community.
Thank you for selflessly sharing your wisdom with us...
Go Back   Pelican Parts Technical BBS > 1- Porsche Technical Forums > Porsche 911 Technical Forum

Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
dyten's Avatar
 
Join Date: Jan 2006
Location: Ottawa, ON, Canada
Posts: 29
Electric windows causing battery drain?

I continue to fight with battery problems. I think the culprit has revealed itself as the electric widows; they always function with or without the keys. I think I need a new button down by the door, does that sound correct? If so how do I figure out which door needs the new sensor. My final question is where can I buy them. I don't know what to call the little gizmos, so my searches have turned up nothing.

Thank you very much for any help!;
__________________
86- black 911

Last edited by dyten; 06-20-2010 at 07:19 PM..
Old 06-20-2010, 06:24 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #1 (permalink)
Registered User
 
steely's Avatar
 
Join Date: Aug 2008
Location: sectors R&M, SE Pa
Posts: 1,705
Hi dyten,

I'll chime in - others who have had this may have more experience.
If your theory is correct, you could pull fuse F1 in the luggage compartment fuse box (3).
This is the main feed to the pwr window switches.
If you are monitoring current draw directly off the battery, you should see the current drop.
It could be the pwr window relay is stuck on - it gets it's pwr from the ignition sw/key.

If you are talking about replacing the switch, they are available thru our host here, but try removing testing and cleaning first (search power window switch). There is no "sensor" in the door.

If you have a Bentley Manual, I am looking at pg 970-42.

hth gets you started.
__________________
Dan


'87 Targa Carrera 3.2 - Fabspeed Cat Bypass, M&K Muffler, SW Chip
Venetian Blue
Old 06-20-2010, 07:18 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #2 (permalink)
Registered User
 
robhamster's Avatar
 
Join Date: Feb 2004
Location: Morrison, Colorado
Posts: 337
Same thing happened to me. I changed out the switch in the drivers door for the passenger window and solved the problem. I drained my battery 4 times over a two month period and was very confused as to why. I even started to suspect ghosts!
__________________
1984 3.2 Cab (now toy)
1975 911S (old toy)
Mercedes E350 W4 (snow car)
2007 911 Turbo (water and air pumper)
2012 Panamera 4S (for the wife, I swear)
Old 06-20-2010, 07:20 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #3 (permalink)
Registered User
 
Laneco's Avatar
 
Join Date: Jan 2005
Location: Medford OR
Posts: 4,740
My 81 and my husband's 80 will operate the windows with the key off and there are zero battery issues. Leave them sitting for months and they fire right up. I think that the window switches on quite a few of the 911's operate with the key in the off position.

If I'm reading your post correctly, the thing that you are describing is the switch for the dome light/interior light (lights off when door closed, on when door is opened). It's not really a sensor, just a push-type switch.

The trick with a 911 or most any car, is to isolate the circuit that is giving you fits and then run that circuit, literally, to ground. I'm really not good at this so I have to be very methodical. I pull all the fuses, then put a voltmeter on the battery. Add the fuses back one by one and find the one (and sometimes more than one) that draws power with the key off. Remember that there are circuits, like the one that runs the clock, or an alarm circuit, that pull a little juice all the time. When I've determined which circuit(s) pull power, I go to the wiring diagram and trace out the wires to each of the components looking for my trouble item.

If you find no reasonable electric draw, don't discount your battery. We've had two batteries in the last 2 months that we've had to replace (both still under warranty).

There are far more knowledgeable people on this board who can help you sort this better than I can. Hope this gives you a direction to go until they chime in. The one thing I would definately NOT do is replace any component or switch until I am 100% sure that it is defective.

angela
__________________
80 Slantnose Cab 3.2 Conversion SCWDP #0035
550-A6 spyder -SS 3.2
81 Coupe "Butters" SCWDP #0036
Dad's SS - 87 Monte Carlo Aerocoupe
Traveling sucks, but it sucks a great deal less when you're driving a Porsche.
Old 06-20-2010, 07:21 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #4 (permalink)
Registered User
 
robhamster's Avatar
 
Join Date: Feb 2004
Location: Morrison, Colorado
Posts: 337
What happened on my switch was the spring failed occasionally and sometimes the switch would stay in the UP position for the passenger window, which I would always push up when parking the car. It only happened four times where I left the car long enough to drain the battery. I have a Cab and can roll windows up and down without a key in the ignition. I cant remember if coupes do that. Its been too long since I owned a coupe.
__________________
1984 3.2 Cab (now toy)
1975 911S (old toy)
Mercedes E350 W4 (snow car)
2007 911 Turbo (water and air pumper)
2012 Panamera 4S (for the wife, I swear)
Old 06-20-2010, 07:31 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #5 (permalink)
Registered User
 
dyten's Avatar
 
Join Date: Jan 2006
Location: Ottawa, ON, Canada
Posts: 29
My father is an electrician; he checked all the fuses for the leak, but no dice. We replaced the alternator and cleaned the ground strap under the car. I realized, after ruining about six batteries, that the windows always work, even days after the last drive.
Wherever the drain is coming from it happens slowly, so slowly that the battery will get drained to the point where it is ruined. Thankfully I bought a battery with a great warranty!
If I'm understanding you Laneco the windows on your 80 & 81 always operate but with no drain? Which would mean that the windows are probably not the issue?
The switches for the windows are centred, not stuck up or down. If it is the windows is it the actual switch to put the windows up and down that I would switch out?
Thanks for all the replies!
__________________
86- black 911
Old 06-20-2010, 08:32 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #6 (permalink)
 
Now Available for Ordering:   101 Projects For Your BMW 3 Series 1982-2000  [more info]
Senior Advisor
 
James Brown's Avatar
 
Join Date: Apr 2007
Location: Bellingham, WA
Posts: 4,972
Garage
Send a message via Yahoo to James Brown
It's normal for the windows to operate with the ignition off. pull that fuse and hook up a trouble light between the hot side of the fuse and the other side and if the light goes on, there is current flow. try that with other fuses and narrow down the current flow keeping in mind that some fuses will show flow (light on) but they are light draws, not enough to drain the battery.
__________________
911, allroad
Old 06-20-2010, 09:23 PM
  Recommend this thread for the PelicanWiki    Reply With Quote #7 (permalink)
Registered User
 
86 911 Targa's Avatar
 
Join Date: Jun 2009
Location: Manhattan Beach, California. Factory Delivery-Original owner-Retired engineer
Posts: 2,855
How it works........

Quote:
Originally Posted by dyten View Post
I continue to fight with battery problems. I think the culprit has revealed itself as the electric widows; they always function with or without the keys. I think I need a new button down by the door, does that sound correct? If so how do I figure out which door needs the new sensor. My final question is where can I buy them. I don't know what to call the little gizmos, so my searches have turned up nothing.

Thank you very much for any help!;
For our '86:

The power windows work only with the key in position(s) 1,2,3.

With one exception.

After turning off the ignition (position 0), the power windows will operate
until one of the doors are opened at which time the power window(s) relay
will open, removing the voltage to the power window switches.

This is part of the logic embeded in the power window relay.



As for your current drain.

With the ignition switch in the "off" position,
remove the power window fuse (#1 25A).

Place your current meter accross the fuse terminals.

Record the value of the current drain.

There will be some small amount as per page 270-6 of the Bentley.

Turn off the interior light(s).
On the Targa, the interior light switch is located on the light.

Remove/replace each door switch one at a time and record the current drain.

If there is no change, the anomoly resides in your power window circuitry.

You may want to replace the door switch caps.

The power window switches are a common cause for these issues.

The voltage is first applied to the passenger side window switch.

Remove the passenger side switch/remove the red/blue wire,
and check for a change in the current draw.

If there is no change, one of the driver's side switches is
the source of the current draw.

Re-connect the passenger switch, and repeat this proceedure with the driver's
side window switch(s).

A fused relay contact on your power window relay may also be the gremlin.

Door switches & (caps 901-615-616-20)/relays/ are available on Pelican.

Good luck,

Gerry

You may pm me

__________________
1986 911 Targa.
Per Road and Track magazine:
Only in L.A.:
In the window of a bar in Hermosa Beach, California.
"Happy Hour prices during all car chases."

Last edited by 86 911 Targa; 06-21-2010 at 04:48 PM..
Old 06-21-2010, 08:25 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #8 (permalink)
Registered User
 
dyten's Avatar
 
Join Date: Jan 2006
Location: Ottawa, ON, Canada
Posts: 29
Quote:
Originally Posted by 86 911 Targa View Post
For our '86:

The power windows work only with the key in position(s) 1,2,3.

With one exception.

After turning off the ignition (position 0), the power windows will operate
until one of the doors are opened at which time the power window(s) relay
will open, removing the voltage to the power window switches.
Thanks you for the diagram and for clearing up when the power windows should work. As I mentioned mine work with the key out even after the doors are opened.
I'm going to try the steps you recommended on the weekend.
Cheers!
__________________
86- black 911
Old 06-21-2010, 10:07 AM
  Recommend this thread for the PelicanWiki    Reply With Quote #9 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 07:56 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.