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Remote will unlock but not lock doors on 2003 MY G500? Anyone heard of this?
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Posted 11/3/2018 3:56 PM
JCH4
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Date registered: Jun 2010
Location: Charleston, SC
Vehicle(s): 2003 G500, LR 1972 IIA, LR 1962 IIA, Husqvarna 350
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Remote will unlock but not lock doors on 2003 MY G500? Anyone heard of this?

This just happened. Remote will unlock but not lock doors on 2003 MY G500? Anyone heard of this? Any suggestions? Help appreciated.
#239998
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Posted 11/3/2018 3:58 PM
DUTCH
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Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter
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RE: Remote will unlock but not lock doors on 2003 MY G500? Anyone heard of this?

Battery in the remote?

Is your vehicle battery fully charged?
#239999 - in reply to #239998
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Posted 11/3/2018 5:45 PM
JCH4
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Date registered: Jun 2010
Location: Charleston, SC
Vehicle(s): 2003 G500, LR 1972 IIA, LR 1962 IIA, Husqvarna 350
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RE: Remote will unlock but not lock doors on 2003 MY G500? Anyone heard of this?

Thanks Dutch. Actually its not the battery the key fob went kaput! I had an extra key I located at the house and it works. The fob itself went bad.
#240000 - in reply to #239998
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Posted 11/4/2018 7:58 AM
DUTCH
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RE: Remote will unlock but not lock doors on 2003 MY G500? Anyone heard of this?

JCH4 - 11/3/2018 5:45 PM

Thanks Dutch. Actually its not the battery the key fob went kaput! I had an extra key I located at the house and it works. The fob itself went bad.


Yes, they do that. I've had to replace one for my 2000 G500 NMLE and the credit card sized emergency back up has also failed. Sadly, it is NLA.
#240006 - in reply to #240000
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Posted 11/4/2018 6:36 PM
AlanMcR
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Date registered: Apr 2006
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RE: Remote will unlock but not lock doors on 2003 MY G500? Anyone heard of this?

DUTCH - 11/4/2018 4:58 AM
JCH4 - 11/3/2018 5:45 PM Thanks Dutch. Actually its not the battery the key fob went kaput! I had an extra key I located at the house and it works. The fob itself went bad.
Yes, they do that. I've had to replace one for my 2000 G500 NMLE and the credit card sized emergency back up has also failed. Sadly, it is NLA.

DUTCH, did your keyfob fail to un/lock the doors or fail to start the engine?  If the latter, the failure may have been in the ECU.  These ECUs are getting old enough that the memory chip that holds the key codes starts forgetting.  I had to replace the memory chip in mine after it forgot the second key.  

#240010 - in reply to #240006
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Posted 11/4/2018 6:44 PM
DUTCH
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RE: Remote will unlock but not lock doors on 2003 MY G500? Anyone heard of this?

AlanMcR - 11/4/2018 6:36 PM

DUTCH, did your keyfob fail to un/lock the doors or fail to start the engine?  If the latter, the failure may have been in the ECU.  These ECUs are getting old enough that the memory chip that holds the key codes starts forgetting.  I had to replace the memory chip in mine after it forgot the second key.  



The key fob is so long ago that I don't remember. The replacement key fob works A-OK.

The credit card emergency key won't lock or unlock the doors. I tried to pry it apart to see if there might be a bad solder joint, but could not open it up.
#240011 - in reply to #240010
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Posted 11/5/2018 9:58 AM
AlanMcR
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Date registered: Apr 2006
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RE: Remote will unlock but not lock doors on 2003 MY G500? Anyone heard of this?

DUTCH - 11/4/2018 3:44 PM
AlanMcR - 11/4/2018 6:36 PM

 

DUTCH, did your keyfob fail to un/lock the doors or fail to start the engine?  If the latter, the failure may have been in the ECU.  These ECUs are getting old enough that the memory chip that holds the key codes starts forgetting.  I had to replace the memory chip in mine after it forgot the second key.  

The key fob is so long ago that I don't remember. The replacement key fob works A-OK. The credit card emergency key won't lock or unlock the doors. I tried to pry it apart to see if there might be a bad solder joint, but could not open it up.

The new key works because its (new) code has been recorded into a new location in the ECU memory.

I didn't realize that the credit card key was meant to unlock the doors.  If so, it has to have a dead battery in it and it is surely fallen out of sync with the locking system: http://www.mercedes.gen.in/synchronising-single-button-ir-mercedes-...

#240014 - in reply to #240011
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Posted 11/5/2018 10:59 AM
DUTCH
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RE: Remote will unlock but not lock doors on 2003 MY G500? Anyone heard of this?

AlanMcR - 11/5/2018 9:58 AM

I didn't realize that the credit card key was meant to unlock the doors.  If so, it has to have a dead battery in it and it is surely fallen out of sync with the locking system: http://www.mercedes.gen.in/synchronising-single-button-ir-mercedes-...



Yes, the credit card key also had IR capability for the locks. I've put in new batteries to no avail. The little indicator red light doesn't even come on. It's really dead as a door nail.
#240015 - in reply to #240014
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Posted 11/6/2018 10:29 AM
paulunm
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Date registered: Jan 2015
Location: Los Angeles
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Re: Remote will unlock but not lock doors on 2003 MY G500? Anyone heard of this?

Alan- for the 463 are following the- press the remote button once, then key in ignition position two within 30 seconds sequence?

I need to try this but the three options are confusing me for some reason.
#240022 - in reply to #240015
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Posted 11/6/2018 11:02 AM
DUTCH
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Re: Remote will unlock but not lock doors on 2003 MY G500? Anyone heard of this?

paulunm - 11/6/2018 10:29 AM

Alan- for the 463 are following the- press the remote button once, then key in ignition position two within 30 seconds sequence?

I need to try this but the three options are confusing me for some reason.


Paul,

Attached PDF is from my 2000 G500 Owners Manual.




Attachments
----------------
Attachments G500_Owner's_Manual_Exterior.pdf (192KB - 11 downloads)
#240023 - in reply to #240022
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Posted 11/6/2018 11:55 AM
paulunm
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Date registered: Jan 2015
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Re: Remote will unlock but not lock doors on 2003 MY G500? Anyone heard of this?

Press remote button twice- within 30 seconds key to position 2.

Perfect, thank you Dutch.
#240024 - in reply to #240023
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Posted 11/6/2018 3:26 PM
Otiswesty
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Re: Remote will unlock but not lock doors on 2003 MY G500? Anyone heard of this?

Tried my 2nd remote today, haven't used it in a long while.
No worky. It started the car fine after unlocking with usual remote.
Will do new batteries and reprogram.

Bummer about the credit card remote not working.
Always wanted to order one of those. Last time I tried, they sent a regular key with the plastic handle. I gave up.
#240026 - in reply to #240023
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Posted 11/6/2018 3:38 PM
DUTCH
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AHA! and YEA!!

otiswesty - 11/6/2018 3:26 PM

Bummer about the credit card remote not working.
Always wanted to order one of those. Last time I tried, they sent a regular key with the plastic handle. I gave up.


I tried a few weeks ago using the EPC P/N; and was told that it is NLA. A real shame.

Edit: I just opened the battery compartment on the credit card remote, cleaned and pried up the battery contacts for better contact and put it back together.

Took it down to the G, and it now works! And it did not require any resetting. Yea!!!

Part of the solution was also to hold the button down for about 1 second rather than a quick push and release.
#240027 - in reply to #240026
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Posted 11/6/2018 5:10 PM
paulunm
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Date registered: Jan 2015
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Re: Remote will unlock but not lock doors on 2003 MY G500? Anyone heard of this?

I have a credit card key that actually works to unlock the doors!

Now I just need to get 3 normal keys working, hopefully the re-sync procedure will help. Dutch I like your technique of re-bending the battery contacts- I'll try that as well.
#240028 - in reply to #240026
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Posted 12/19/2018 3:17 PM
Nazrat
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RE: Remote will unlock but not lock doors on 2003 MY G500? Anyone heard of this?

JCH4 - 11/3/2018 3:56 PM

This just happened. Remote will unlock but not lock doors on 2003 MY G500? Anyone heard of this? Any suggestions? Help appreciated.


Did you manage to get this resolved? I just changed the battery in the key for my 2003 G500 and now the remote no longer functions. The light works on the remote, and it still starts the truck but neither the RF nor the IR functions are recognized by the vehicle.

Thanks!
#240259 - in reply to #239998
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Posted 12/19/2018 4:09 PM
fernweh



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RE: Remote will unlock but not lock doors on 2003 MY G500? Anyone heard of this?

On the 2003 G500,

it might not be the key fob, but the door lock solenoid.

It could be still working in the locking position, but no longer in the unlock mode.

Especially, if its only one door or two, which are giving you a trouble.

Used MB G Class solenoids are impossible to find, I was able to modify a similar unit from a BMW,

but do not remember which ones I got from ebay.de
#240260 - in reply to #240259
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