Key Fob issue (won't open/lock/trunk) but still starts
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Joined: Sep 2017
Posts: 162
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2006 S430 AMG
Key Fob issue (won't open/lock/trunk) but still starts
I'm usually pretty diligent about starting my car every 3-4 days, but I'm flawed. Car died and I had to pop start it. Everything is good but my keyfob will not work (it only starts the car).
I checked the battery/signal and it's fine.I also checked fuse 58 but it looks good.
I did the keyfob 3 different reset procedures but nothing. Here is what I tried so farProcedure #1
Pos 1> hold lock 5 sec >hold unlock 5 sec >Hold both for 5 sec > repeat in Pos 2
Procedure #3
https://itstillruns.com/reset-mercedes-key-7492936.html
Procedure #4
https://itstillruns.com/reprogram-me...e-5014706.html
I tried above multiple times, still no luck.
Any ideas what else I can do?
I checked the battery/signal and it's fine.I also checked fuse 58 but it looks good.
I did the keyfob 3 different reset procedures but nothing. Here is what I tried so farProcedure #1
- Insert the key into the ignition.
- Quickly remove key from ignition and within 10 seconds hold down the lock button.
- Continue holding the lock button, and at the same time press, the unlock button five times.
- Next release all buttons and press the gate/trunk button one time.
- Your Mercedes remote should be synchronized. Test to see if lock / unlock functions are working.
Pos 1> hold lock 5 sec >hold unlock 5 sec >Hold both for 5 sec > repeat in Pos 2
Procedure #3
https://itstillruns.com/reset-mercedes-key-7492936.html
Procedure #4
https://itstillruns.com/reprogram-me...e-5014706.html
I tried above multiple times, still no luck.
Any ideas what else I can do?
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Joined: Jan 2008
Posts: 6,150
Likes: 533
Mercedes
I'm usually pretty diligent about starting my car every 3-4 days, but I'm flawed. Car died and I had to pop start it. Everything is good but my keyfob will not work (it only starts the car).
I checked the battery/signal and it's fine.I also checked fuse 58 but it looks good.
I did the keyfob 3 different reset procedures but nothing. Here is what I tried so farProcedure #1
Pos 1> hold lock 5 sec >hold unlock 5 sec >Hold both for 5 sec > repeat in Pos 2
Procedure #3
https://itstillruns.com/reset-mercedes-key-7492936.html
Procedure #4
https://itstillruns.com/reprogram-me...e-5014706.html
I tried above multiple times, still no luck.
Any ideas what else I can do?
I checked the battery/signal and it's fine.I also checked fuse 58 but it looks good.
I did the keyfob 3 different reset procedures but nothing. Here is what I tried so farProcedure #1
- Insert the key into the ignition.
- Quickly remove key from ignition and within 10 seconds hold down the lock button.
- Continue holding the lock button, and at the same time press, the unlock button five times.
- Next release all buttons and press the gate/trunk button one time.
- Your Mercedes remote should be synchronized. Test to see if lock / unlock functions are working.
Pos 1> hold lock 5 sec >hold unlock 5 sec >Hold both for 5 sec > repeat in Pos 2
Procedure #3
https://itstillruns.com/reset-mercedes-key-7492936.html
Procedure #4
https://itstillruns.com/reprogram-me...e-5014706.html
I tried above multiple times, still no luck.
Any ideas what else I can do?
Replace your key fob battery
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Joined: Dec 2012
Posts: 2,473
Likes: 439
From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
Try the IR method of lock/unlock - Point the end of the key with the window directly at the small black rectangle on the driver's external door handle from nearby, and hold down the lock button on the key fob for several seconds to see if the doors lock. Repeat while holding down the unlock button. The doors should unlock, the sunroof should open and the windows should roll down. If this works, the battery in the key is functional, and the problem is in the RF portion of the key or the car. If neither the IR nor the RF work, the problem is likely to be the fob battery or its connection. If you changed the battery, make certain that the battery is installed correctly, and that you have two batteries if required.
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Joined: Apr 2016
Posts: 287
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From: Colorado
2004 W240 Maybach 57
To expand a bit on the abbreviations: IR is InfraRed, or optical (light) based. That's why you need to point the transmitter in the fob at the receiver in the door handle. RF is Radio Frequency or electronic signal based, so fob can stay in your pocket to lock/unlock, when it operating normally of course.
Thread Starter
Member
Joined: Sep 2017
Posts: 162
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2006 S430 AMG
I checked the battery first (sorry forgot to add that in). I used the phone camera to check for the light on the bottom of the key.
Both key batteries are good
So it looks like it works when I point it at the handle (close).
Sounds like the Antena is not getting the signal?
Both key batteries are good
So it looks like it works when I point it at the handle (close).
Sounds like the Antena is not getting the signal?
Last edited by S430AMG; Jan 21, 2020 at 12:27 PM.
MBWorld Fanatic!
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Posts: 6,150
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Mercedes
Then likely your alarm siren box has failed , they contain a lithium battery which is not replaceable and fails around this age
buy a new siren box from the dealer , all used ones have an equally old battery
buy a new siren box from the dealer , all used ones have an equally old battery
Thread Starter
Member
Joined: Sep 2017
Posts: 162
Likes: 18
2006 S430 AMG
I just pulled fuse 61, and it wasn't blown. But when I put it back........it started working. Weird
PS. I did also redid all of the steps to resync prior to pulling fuse (but much quicker, within 10 sec). But when I tested directly after, it wasn't working.
Seems like pulling the fuse did the trick? I also pulled 2 other fuses (# 1 and #2 from the right side of the rear seat fuse box). #61 is 5th.
Thanks to everyone for your help!
PS. I did also redid all of the steps to resync prior to pulling fuse (but much quicker, within 10 sec). But when I tested directly after, it wasn't working.
Seems like pulling the fuse did the trick? I also pulled 2 other fuses (# 1 and #2 from the right side of the rear seat fuse box). #61 is 5th.
Thanks to everyone for your help!
Last edited by S430AMG; Jan 21, 2020 at 12:40 PM.
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MBWorld Fanatic!
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From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
Occasionally the fuse blade-to-socket connection develops a bit of corrosion that might stop current flow - removing and inserting can clear such corrosion.
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Thread Starter
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2006 S430 AMG
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Try the IR method of lock/unlock - Point the end of the key with the window directly at the small black rectangle on the driver's external door handle from nearby, and hold down the lock button on the key fob for several seconds to see if the doors lock. Repeat while holding down the unlock button Los Angeles Car Lock Services. The doors should unlock, the sunroof should open and the windows should roll down. If this works, the battery in the key is functional, and the problem is in the RF portion of the key or the car. If neither the IR nor the RF work, the problem is likely to be the fob battery or its connection. If you changed the battery, make certain that the battery is installed correctly, and that you have two batteries if required.
MBWorld Fanatic!
Joined: Dec 2012
Posts: 2,473
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From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
Possibly a poor connection on the key fob LOCK button. Carefully cleaning the "rubber" contact and the copper connection point on the PCB (Printed Circuit Board) might help.
Possibly a failure of the LOCK solenoid valve in the PSE (Pneumatic Service Equipment) unit.
Possibly a failure of the LOCK solenoid valve in the PSE (Pneumatic Service Equipment) unit.
