Infrared keyless entry 95 sl500 - Mercedes-Benz Forum
 
LinkBack Thread Tools Display Modes
#1 (permalink) Old 06-06-2010, 03:17 AM
BenzWorld Junior Member
 
Date registered: Feb 2010
Vehicle: Mercedes Benz SL500 1995 / Mercedes Benz 1981 380SL
Location: Southaven MS
Posts: 22
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
Cool Infrared keyless entry 95 sl500

It seems that my keyless entry is not working. I tried new batteries with no luck. What is the next logical step in this troubleshooting procedure? thanks for the help.
keito is offline  
Sponsored Links
Advertisement
 
#2 (permalink) Old 06-06-2010, 04:32 AM
BenzWorld Senior Member
 
Date registered: Dec 2009
Vehicle: 1995 SL500
Location: Chicago
Posts: 441
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
My 1995 did this once randomly as well. Using the regular key to cycle the lock on the drivers door reset it somehow. Not sure it is your problem, worth trying though.

Mine did this only once oddly and normally works fine.
500SL4Me is offline  
#3 (permalink) Old 06-06-2010, 07:57 AM
BenzWorld Elite
 
ulflei's Avatar
 
Date registered: Aug 2005
Vehicle: 85 300SL Euro,97 SL320,95 S420,07 S550
Location: Naples, Florida
Posts: 1,577
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Probably the vacuum pump
ulflei is offline  
#4 (permalink) Old 06-06-2010, 09:20 AM
BenzWorld Veteran
 
Date registered: Jun 2007
Vehicle: 1995 SL 500 2005 SL500
Location: SouthWest Coast of Florida
Posts: 639
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Post

see PDF
Attached Files
File Type: pdf Infrared.pdf (38.3 KB, 620 views)
Lee Wireless is offline  
#5 (permalink) Old 06-06-2010, 02:04 PM
Premium Member
 
bayhas's Avatar
 
Date registered: Oct 2005
Vehicle: SL55, SL500, 300SE, ML430, Saturn SCX 1.9L DOHC.
Location: Lincoln / Boston - MA
Posts: 8,749
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Premium Member
Garage
Send a message via MSN to bayhas Send a message via Yahoo to bayhas
Quote:
Originally Posted by ulflei View Post
Probably the vacuum pump
only if the car is flashing green and red, but locks are not operating...

that doesnt sound like it is the case here...



Test the remote itself to make sure it is still operational, hold the button for 3-5 seconds, make sure the tip flashes in red.

next, try to resync the key, lock, unlock the driver door with the key blade, put the key in the ingnition, turn to position 2, then off again, then cycle the key blade one more time in the door, while the green light of the door is still flashing green, aim the remote and push the lock switch. the flashing will pause if the car recieves a signal..

at this point, the key must be resynced, and you should be able to lock and unlock normally with the remote.

if the flashing stops (as mentioned above) but the car still does not recognize the key, you either have the wrong remote, or a bad module.

Garage:

Mercedes-Benz, W140 S Class S320 (AKA 300SE)

Mercedes-Benz, R230 SL Class SL55 (///AMG)

Mercedes-Benz, R129 SL Class SL500 (AKA 500SL)

Mercedes-Benz, W163 ML Class ML430 (Designo Edition)

Triumph Daytona 955i - SSSA

Former Mercs:
W140 S Class 500SEL(sold) - W140 S Class S320(sold) - W140 S Class S500(sold) - W140 S Class 500SEL(sold) - W201 190E 2.3(sold)
bayhas is offline  
#6 (permalink) Old 06-06-2010, 07:20 PM
BenzWorld Junior Member
 
Ali Denton-Cardew's Avatar
 
Date registered: Jan 2009
Vehicle: SL500 1990, USA specification. Chassis No. WDB FA66E5 LF 005675
Location: Dubai, U.A.E.
Posts: 47
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Keito, the electronic internals of key-fob do become damaged or defective over time. High chance that solder joints have become dry, or fatigue fractures developed around a component.
Question - is the keyfob creating an infra-red signal?
Even the visible light 'flash' seen after 2/3 seconds does not always mean an infra-red signal is going out.
Quick way to test this - use any digital camera (or camera-phone). Hold fob pointing toward your phone / camera. Press activation button, watch camera for 'flash' from module that naked eye cannot see. If no 'flash' (which is more like pulses, than a flash) then internals are defective and need re-soldering etc.
Try with any tv or stereo remote to see camera spot what naked eye cannot see.
There is a post of about two years back with photos, where a fob was opened and internals / battery posts re-soldered.

Good luck and regards,
Ali D-C.
Ali Denton-Cardew is offline  
#7 (permalink) Old 06-06-2010, 08:30 PM
Premium Member
 
bayhas's Avatar
 
Date registered: Oct 2005
Vehicle: SL55, SL500, 300SE, ML430, Saturn SCX 1.9L DOHC.
Location: Lincoln / Boston - MA
Posts: 8,749
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Premium Member
Garage
Send a message via MSN to bayhas Send a message via Yahoo to bayhas
Quote:
Originally Posted by Ali Denton-Cardew View Post
Keito, the electronic internals of key-fob do become damaged or defective over time. High chance that solder joints have become dry, or fatigue fractures developed around a component.
Question - is the keyfob creating an infra-red signal?
Even the visible light 'flash' seen after 2/3 seconds does not always mean an infra-red signal is going out.
Quick way to test this - use any digital camera (or camera-phone). Hold fob pointing toward your phone / camera. Press activation button, watch camera for 'flash' from module that naked eye cannot see. If no 'flash' (which is more like pulses, than a flash) then internals are defective and need re-soldering etc.
Try with any tv or stereo remote to see camera spot what naked eye cannot see.
There is a post of about two years back with photos, where a fob was opened and internals / battery posts re-soldered.

Good luck and regards,
Ali D-C.
3ali,

the key fob internals consist of surface mount components with a slim to non chance of delaminating under regular to extreme conditions...

also, all components in the key fob are solid state, except for the switch itself.

as far as the infrared beam, it is visible if you look at it in a dark room, so no need for the camera.

furthermore, the PCB, by design, makes it very hard to fail in a fashion that allows the test red LED to be excited, (notice the name "test LED", infrared not to be emmited...

basically the key for circuity is so simple, that you may get all or none in 99.999% of the cases...

Garage:

Mercedes-Benz, W140 S Class S320 (AKA 300SE)

Mercedes-Benz, R230 SL Class SL55 (///AMG)

Mercedes-Benz, R129 SL Class SL500 (AKA 500SL)

Mercedes-Benz, W163 ML Class ML430 (Designo Edition)

Triumph Daytona 955i - SSSA

Former Mercs:
W140 S Class 500SEL(sold) - W140 S Class S320(sold) - W140 S Class S500(sold) - W140 S Class 500SEL(sold) - W201 190E 2.3(sold)
bayhas is offline  
Reply

  Mercedes-Benz Forum > Mercedes-Benz Roadster Forums > R129 SL Class


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Topic Author Forum Replies Last Post
Keyless Infrared Receiver Module help! Sinned420 W140 S-Class 12 05-05-2010 03:10 PM
Keyless entry NOT!!!!!! SNKDTR W140 S-Class 2 07-25-2008 07:06 AM
keyless entry Chef G-Class 2 09-18-2004 12:07 PM
keyless entry Guest (MBNZ) W201 190 Class 2 11-02-2003 03:27 PM
2000 S-Class infrared remote keyless entry Guest (MBNZ) W220 S-Class 1 01-15-2003 12:20 PM

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome