Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 07-26-2011, 02:18 PM
Banned
 
Join Date: Dec 2007
Posts: 5,061
Lock sequence for 1991 560SEL

OK, I have wondered about this for some time. When I exit the car and lock the doors, sometimes the trunk does not unlock. when I relock and then unlock the doors with the door key, the trunk then unlocks. what gives?

Reply With Quote
  #2  
Old 07-26-2011, 03:27 PM
LandYaghtLover's Avatar
Registered User
 
Join Date: Jun 2010
Location: Green Bay, WI
Posts: 1,341
I dont have an answer, but I similar issue with my driver's side back door. In its case, it does not always lock. I have to open it up and shut it hard.

Per the manual, this is a sign that the door was not closed or fully closed. It is however. I can only assume something similar with the trunk. There must be a sensor/switch that allows action of the vacuum system to lock/unlock the door/trunk. And when that thing is out of line, there is a problem. At least thats my guess. I have not had time to look into it.
__________________
1991 560 SEL / 185k miles
1992 750il / 17k miles - project car
Reply With Quote
  #3  
Old 07-26-2011, 06:00 PM
Registered User
 
Join Date: Jan 2003
Location: Dallas
Posts: 790
I don't have the car/manual right now, and memory is hazy, but there is a process by which the trunk unlock can be overridden, by inserting the key and turning it the opposite direction. it might be possible your trunk switch is tweaked in that direction, causing an intermittant malfunction - but probably not.

The whole system operates on a central vacuum source, so if the trunk or one of the doors doesn't lock/unlock, it's very likely due to a faulty vacuum actuator, or mechanical resistance/friction in that actuator mechanism.
It works when you lock/unlock it rapidly because it temporarily loosens it up by going forward/backward. You should be able to track it down by:
- Hit the unlock and see which switches unlock first and which unlock last. The slowest lock wiill be the weakest or stickiest mechanism. Check the vacuum line to the trunk lock if it's slow.
- insert the key in the trunk and work the mechanism manually to see how sticky it is. Zap it with WD40 and see if it helps.

DG
Reply With Quote
  #4  
Old 07-26-2011, 06:09 PM
compu_85's Avatar
Waiting for his Model 3..
 
Join Date: May 2008
Location: Springfield VA
Posts: 5,174
On my car all of the lids and doors lock and unlock together.

-Jason
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
Reply With Quote
  #5  
Old 07-26-2011, 06:34 PM
Banned
 
Join Date: Dec 2007
Posts: 5,061
Quote:
Originally Posted by S-Class Guru View Post
I don't have the car/manual right now, and memory is hazy, but there is a process by which the trunk unlock can be overridden, by inserting the key and turning it the opposite direction. it might be possible your trunk switch is tweaked in that direction, causing an intermittant malfunction - but probably not.

The whole system operates on a central vacuum source, so if the trunk or one of the doors doesn't lock/unlock, it's very likely due to a faulty vacuum actuator, or mechanical resistance/friction in that actuator mechanism.
It works when you lock/unlock it rapidly because it temporarily loosens it up by going forward/backward. You should be able to track it down by:
- Hit the unlock and see which switches unlock first and which unlock last. The slowest lock wiill be the weakest or stickiest mechanism. Check the vacuum line to the trunk lock if it's slow.
- insert the key in the trunk and work the mechanism manually to see how sticky it is. Zap it with WD40 and see if it helps.

DG
Thanks, will try this and get back here on the forum with updates.
Reply With Quote
  #6  
Old 07-26-2011, 08:21 PM
compu_85's Avatar
Waiting for his Model 3..
 
Join Date: May 2008
Location: Springfield VA
Posts: 5,174
The trunk lock has 3 settings: Unlock (the whole car), Lock (the whole car), and Bolted (trunk remains locked when car is unlocked).

-J
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
Reply With Quote
  #7  
Old 07-27-2011, 08:44 AM
Banned
 
Join Date: Dec 2007
Posts: 5,061
Quote:
Originally Posted by compu_85 View Post
The trunk lock has 3 settings: Unlock (the whole car), Lock (the whole car), and Bolted (trunk remains locked when car is unlocked).

-J
So, how do I change the settings?
Reply With Quote
  #8  
Old 07-27-2011, 09:27 AM
compu_85's Avatar
Waiting for his Model 3..
 
Join Date: May 2008
Location: Springfield VA
Posts: 5,174
Use the key in the button IIRC to the left is unlock, middle is with central locking, and right is lock / bolt. To lock the trunk and leave it on central locking you turn the key to the right then back to the middle.

-J
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
Reply With Quote
  #9  
Old 07-27-2011, 02:00 PM
LandYaghtLover's Avatar
Registered User
 
Join Date: Jun 2010
Location: Green Bay, WI
Posts: 1,341
Never thought of that trunk lock setting being the problem. I never use that function and totally forgot after reading the manual. I always unlock/lock the trunk the same way and never turned the key to the right.
__________________
1991 560 SEL / 185k miles
1992 750il / 17k miles - project car
Reply With Quote
  #10  
Old 07-27-2011, 06:28 PM
Registered User
 
Join Date: Jan 2003
Location: Dallas
Posts: 790
Yeah, I never used that function, so I forgot the details.
Then there's the Valet key, which will not unlock the glovebox or the trunk, but will unlock the doors and start the car.

As Compu said, all the locks SHOULD lock/unlock together, but often some are slower, indicating a possible problem in the making.

DG
Reply With Quote
  #11  
Old 07-27-2011, 06:45 PM
LandYaghtLover's Avatar
Registered User
 
Join Date: Jun 2010
Location: Green Bay, WI
Posts: 1,341
Mine never locked together, they go in a quick sequence. Same goes for unlocking. If I unlock the driver's side door but plan on opening the rear, I have to wait about 1 second.

__________________
1991 560 SEL / 185k miles
1992 750il / 17k miles - project car
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 01:10 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page