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Normally you hit the lock button twice to make the horn beep, but I think your car does a double beep but it not the horn if it dont beep anymore you could have it fixed but would it be worth it?
take your key fob and depress both lock and unlock at the same time . the system will switch back and forth
Press the lock button a second time.
You don't.
It should lock when you lock your doors.
doors locks & trunk lock not working
If the Montero's horn sounds continuously when doors are locked with the remote, this is due a horn pad failure. To repair, replace the horn pad assembly.
Hold down the panic and lock button on the transmitter for 10 seconds.
Hold down the lock and unlock buttons, on the key fob, together for several seconds and the system will change to lights with horn.
That means a door is still open or the back glass/gate is open. it will beep once when the doors are closed
its not an alarm. its called a programmable horn chirp. made to indicate locking has occurred and for safety when you approach you car in a dark area. you can deactivate it by holding the lock switch in the unlock position for 10 seconds with the ignition in the ON position and all the doors closed. to reactivate repeat procedure
You can't.