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Old 01-22-2005, 06:29 PM
"Da Benzito"
Join Date: Oct 2004
Location: Durham, NC
Posts: 106
StRaNgEsT LoCk PrObLeM PleAsE HeLp!!

Today my door locks began malfunctioning. This may have been caused by a jarring from the slight accident I was involved in today, when Red Kia slid into the back of me when I was attempting to make a turn. She was only going about 5 mph so, the Benz received absolutely no damage whatsoever, while her car received in excess of 1000 usd in damage. Anyway today I also disconnected by aftermarket alarm to have it repaired, and this is when I noticed the locks were not working correctly. The problem occurs with the driver's side lock. When inside the car I can only unlock or lock the driver side lock and no others, when I pull the lock knob. Also, when I try to lock the doors from the driver's side tumbler, only the driver's side knob goes down. Same thing happens when I try to unlock the doors from the driver's side. The trunk lock still functions properly, allowing me to lock and unlock the doors. I do not like not being able to lock all the doors from the driver's side though so I would like to fix this problem quickly. I am assuming that the problem lies within the driver's side lock actuator or vacuum lines, but do not know one way or another. Any advice would be greatly appreciated.


Knight Rider521

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Old 01-22-2005, 08:06 PM
waybomb's Avatar
Registered User
Join Date: Nov 2002
Location: St. Joe, MI; Manitowoc, WI
Posts: 1,553
We had a poltergeist issue with the door locks on our 97 C280 - turned out to be a busted pasenger side door switch - the one that controls the dome light.
Thank You!
2001 E430 Sport, 204,000 miles
1997 C280 Sport, 144,000 miles
1991 300SL, 189,000 miles
1987 420SEL, 149,000 miles
1986 190e 2.3 16v, 151,000
1968 W30 442, 78,000 miles
1988 46' US1 Cougar, 3 supercharged 572's
Warming the globe, 24 cylinders at a time
And I want a 126 wagon! Point me to one!
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Old 01-22-2005, 11:31 PM
Registered User
Join Date: Dec 2004
Location: Seattle WA
Posts: 82
Not able to tell what model you have ,but is it possible that your aftermarket alarm was in some way tied into your foctory lock system so it would all work together? Mybe the alarm used a factory wire to tell it something and removing the alarm you may have removed a signal that it was passing onto the foctory lock system and now the origanal wire has to be hooked back up.

Just a thought
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Old 01-23-2005, 04:42 AM
Registered User
Join Date: Oct 2004
Posts: 482
Caps lock problem?
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Old 01-23-2005, 07:36 AM
wbain5280's Avatar
Registered User
Join Date: May 2001
Location: Northern Va.
Posts: 3,386
Originally Posted by danwatt
Caps lock problem?
Camelback caps.


Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL


Not part of the in-crowd since 1952.
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Old 01-23-2005, 11:03 AM
"Da Benzito"
Join Date: Oct 2004
Location: Durham, NC
Posts: 106
I have a 1985 300sd. The aftermarket alarm was not tied into the vacuum system to prevent it from working when disconnected. Even with the keyless entry I would sometimes lock the car from the driver's side of the car, and it would work fine. It is just now that I seem to be having problems.
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Old 01-23-2005, 11:37 AM
Registered User
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Driver's door switch is bad, or the aftermarket alarm is screwing up the signals -- if the trunk lock works properly, it can only be the door switch.

Most likely you need to replace the actuator in the driver's door, as I believe it contains the switch. Only the alarm switch is in the actual lock.

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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Old 01-30-2005, 02:22 PM
"Da Benzito"
Join Date: Oct 2004
Location: Durham, NC
Posts: 106
Would anybody happen to have the part number for the door switch, so I can order one.

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