E-Class (W211) 2003-2009

E200 wont switch off and horn keeps coming on... think I have a short

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Old 04-25-2015 | 03:36 PM
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Aaron J Cotter's Avatar
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E200 petrol
E200 wont switch off and horn keeps coming on... think I have a short

Hi everyone....


I have a E200 automatic petrol, 2007. The horn started to come on yesterday and today the engine wont switch off.... have the key in my hand and the car is running away outside!!
Looking for some guidance please before I bring to the garage. I'm a trained industrial electrician as well as an mechanical engineer, so would like to take a stab at it before I pay a professional. Used to electrical shorts in industrial equipment but without drawings etc its very difficult.

Cheers,

Aaron.
Old 04-27-2015 | 11:55 AM
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bone stock E55 AMG
moved to W211 forum...
Old 04-27-2015 | 04:16 PM
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cmriv's Avatar
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2009 E550 2000 Honda civic mash n' go
Originally Posted by Aaron J Cotter
Hi everyone....


I have a E200 automatic petrol, 2007. The horn started to come on yesterday and today the engine wont switch off.... have the key in my hand and the car is running away outside!!
Looking for some guidance please before I bring to the garage. I'm a trained industrial electrician as well as an mechanical engineer, so would like to take a stab at it before I pay a professional. Used to electrical shorts in industrial equipment but without drawings etc its very difficult.

Cheers,

Aaron.
EIS, Electronic ignition system..... maybe. Or it could be a SAM issue. Run codes? You gotta get some diag codes, otherwise your pissin in the wind!!!!

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