Fuse 78 blows- Alarm Horn, EIS, ME-SFI
Thread Starter
Newbie
Joined: Sep 2021
Posts: 2
Likes: 1
From: Ozarks
2005 Mercedes S500
Fuse 78 blows- Alarm Horn, EIS, ME-SFI
Hi folks-
Accidental Mercedes owner here. We have a gorgeous 2005 S500 in great condition, 54,000 miles and has never seen winter. Garage kept its entire life.
It's been on a trickle charger and ran when parked. The battery is good but when I went to wake it up (after 5 months), it will not come to life at all. It does not recognize the key.
Fuse #78 in the passenger door fuse panel pops when you put it in.
Am I correct that the W220 does not have a steering lock? The wheel is unlocked. The remotes have new batteries (immaterial, since the module which recognizes it has no power when the fuse is blown).
I have no ideas.
Is there a common problem with these cars which can be checked out? I cannot get it out of gear and it's hemmed into our garage on both sides.
I am not afraid to work on things, but I am afraid of this car. Are there other fuses or items I can unplug to try and isolate the thing which is the root issue?
Any help is appreciated.
Accidental Mercedes owner here. We have a gorgeous 2005 S500 in great condition, 54,000 miles and has never seen winter. Garage kept its entire life.
It's been on a trickle charger and ran when parked. The battery is good but when I went to wake it up (after 5 months), it will not come to life at all. It does not recognize the key.
Fuse #78 in the passenger door fuse panel pops when you put it in.
Am I correct that the W220 does not have a steering lock? The wheel is unlocked. The remotes have new batteries (immaterial, since the module which recognizes it has no power when the fuse is blown).
I have no ideas.
Is there a common problem with these cars which can be checked out? I cannot get it out of gear and it's hemmed into our garage on both sides.
I am not afraid to work on things, but I am afraid of this car. Are there other fuses or items I can unplug to try and isolate the thing which is the root issue?
Any help is appreciated.
MBWorld Fanatic!
Joined: Jan 2008
Posts: 6,150
Likes: 533
Mercedes
It’s your alarm siren box located in the fender . Buy a new one from Mercedes as it has a old lithium internal battery so you need to buy it New
all used ones are just as old
or you just disconnect it
https://www.benzworld.org/threads/20...#post-18266429
all used ones are just as old
or you just disconnect it
https://www.benzworld.org/threads/20...#post-18266429
Thread Starter
Newbie
Joined: Sep 2021
Posts: 2
Likes: 1
From: Ozarks
2005 Mercedes S500
Solved!
Thanks guys!
With the battery disconnected, I removed the Alarm siren, mummified the plug in tape, secured it in place.
I replaced the 7.5 amp fuse (#78) and Viola! It starts and runs normally now. I don't see a need for an alarm siren anyhow.
Much appreciated.
With the battery disconnected, I removed the Alarm siren, mummified the plug in tape, secured it in place.
I replaced the 7.5 amp fuse (#78) and Viola! It starts and runs normally now. I don't see a need for an alarm siren anyhow.
Much appreciated.
