Volvo S80 2007 Horn stayed continuous on

DIYMAN · Jan 16th, 2015, 13:32

Hi,
The horn (not the alarm) self activated while the car was standing alone at the back yard. The only way to stop it was to remove the - connector at the battery. Connecting back the battery -> after a while the horn activated again (not immediately). Removed the horn fuse to allow temporary use.

Has someone met the similar malfunction?
Any ideas to fix it?
I assume, that the CEM module is receiving continuously false "activate horn" signal (active= connected to ground). Will check the wiring: horn switch-SWM - CEM.
Would the CEM module internal circuit diagrams be available somewhere?

Waiting for any additional information,
regards
Asko Mitrunen

inaminute23 · Oct 30th, 2017, 16:02

I have a very similar problem. Did you find a fix?

Jan 16th, 2015, 13:32	#1
DIYMAN New Member Last Online: Feb 2nd, 2015 11:40 Join Date: Jan 2015 Location: Espoo	Volvo S80 2007 Horn stayed continuous on Hi, The horn (not the alarm) self activated while the car was standing alone at the back yard. The only way to stop it was to remove the - connector at the battery. Connecting back the battery -> after a while the horn activated again (not immediately). Removed the horn fuse to allow temporary use. Has someone met the similar malfunction? Any ideas to fix it? I assume, that the CEM module is receiving continuously false "activate horn" signal (active= connected to ground). Will check the wiring: horn switch-SWM - CEM. Would the CEM module internal circuit diagrams be available somewhere? Waiting for any additional information, regards Asko Mitrunen

Oct 30th, 2017, 16:02	#2
inaminute23 New Member Last Online: Oct 6th, 2021 15:30 Join Date: Oct 2017 Location: Altrincham	I have a very similar problem. Did you find a fix?

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