Replaced alarm siren. Switch polarity changes!
Thread Starter
Super Member
Joined: Jan 2010
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From: chicago
Firemist O5 CLK55 Cab Silver 05 CLK55 Coupe Tanzanite 06 CLK500 Coupe
Replaced alarm siren. Switch polarity changes!
Some things.....
Battery on the old one was toast so I tossed in a new alarm siren which does gently beep. What is amazing is that the door lock switch on the main dash panel reversed polarity so lock is unclock and v/v.
Battery on the old one was toast so I tossed in a new alarm siren which does gently beep. What is amazing is that the door lock switch on the main dash panel reversed polarity so lock is unclock and v/v.
Thread Starter
Super Member
Joined: Jan 2010
Posts: 576
Likes: 28
From: chicago
Firemist O5 CLK55 Cab Silver 05 CLK55 Coupe Tanzanite 06 CLK500 Coupe
No Change after pulling fuse
I might get around to revisiting the siren but it is a minor pita to get at.
Almost took a video in case anyone doubted the ridiculousness of this one.
Almost took a video in case anyone doubted the ridiculousness of this one.
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Joined: Dec 2009
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NO LONGER ACTIVE
I would then say that the ATA siren has nothing to do with this issue. And in fact the ATA system has nothign to do with locking the doors, except that when you lock and unlock with the SmartKey gob, it also arms and disarms the ATA.
This almost has to be an issue with the UCP where the central locking button is located. The way it works, when you press a button, it sends a signal over the CAN bus which is then received by any device that needs that command. In this case, the door controllers receive the signal and lock or unlock as appropriate. Since both doors are locking and unlocking together, I'd say it's not a door controller issue, this I think it's the UCP. Try pulling fuse 25 (cabin panel) to reset it.
This almost has to be an issue with the UCP where the central locking button is located. The way it works, when you press a button, it sends a signal over the CAN bus which is then received by any device that needs that command. In this case, the door controllers receive the signal and lock or unlock as appropriate. Since both doors are locking and unlocking together, I'd say it's not a door controller issue, this I think it's the UCP. Try pulling fuse 25 (cabin panel) to reset it.
Thread Starter
Super Member
Joined: Jan 2010
Posts: 576
Likes: 28
From: chicago
Firemist O5 CLK55 Cab Silver 05 CLK55 Coupe Tanzanite 06 CLK500 Coupe
Open to all guesses
I pulled fuses and the the ground cable.
Central locking switch functional and polarity remains reversed.
Central locking switch functional and polarity remains reversed.
Thread Starter
Super Member
Joined: Jan 2010
Posts: 576
Likes: 28
From: chicago
Firemist O5 CLK55 Cab Silver 05 CLK55 Coupe Tanzanite 06 CLK500 Coupe
I was thinking about calling a Priest
for a non related electrical issue at home but that one at least has a viable explanation.
this one.............
this one.............
