horn blows with replacement battery

Asked by Apr 30, 2017 at 11:05 PM about the 2001 Mercury Villager 4 Dr Estate Passenger Van

Question type: Maintenance & Repair

Car has been sitting outdoors for a couple months without being started or
driven.  Car ran OK when we parked it.  Battery is of unknown age (at least
two years old).  Battery seemed dead when trying to start the van.  I tried
jumping the van with riding mower, horn blew as soon as I connected the
jumper cables.  I put a trickle charger on the old battery.  When the charger
would apply power, the dashboard instruments would cycle.  But after
charging throughout the afternoon, there was not even enough power to
hear the solenoid click.  Went out and purchased a new battery.  
Connected the ground side, and when connecting the positive side, the
horn would blow intermittently and not stop.  Engine would not turn over
(during horn blowing), dash display had the check engine light on, and
electric windows worked.  Disconnected positive side so neighbors would
not shoot me.  Again... the van ran fine when we stopped driving it a couple
months ago.

2 Answers

165

It sounds like you've got some type of aftermarket alarm installed, potentially? Though, being that it's a Nissan, it might just have a small quirky thing with the ECU where you just need to hit the unlock button on the remote to stop the horn honk. However, the key being in the ignition and cranking would typically interrupt that anti-theft exhibit promptly as well. Try the remote, if you've got that option. If not, pull the horn relay out before further diagnosing.

Your advise was spot on. Connected the cables to a new battery, horn started pulsing, and I hit the door lock fob. Horn stopped, snugged up the battery cables, and started the engine. Thanks

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