Horn used to sound on double lock door button on key fob. somehow is now deactivated. how do i fix?

for sure not just a bad horn button or its relay
when it alarms does the dash screen show door errors>?
it is not a single system it is deeply integrated in to all.
do not fool around air bags, or boom, they must be disabled first working near any air bag SRS



I FEEL YOUR PAIN, MOST OEM ALARMS CAN NOT BE FULLY DISABLED (AS IN FOR EVER , HACKED?)
IS THE CAR BATTERY FULLY CHARGED, NOT WEAK?
ONE SOLUTION IS TO ASK THE DEALER TO DISABLE IT
OR PULL THE HORN FUSE f8.. JUST TO GET SILENCE
I AM NOT TALKING IMMOBLIZER HERE. JUST THE DOOR ALARMS.

SCAN THE PCM FIRST (IT MAY TELL YOU WHICH DOOR FAILS)
THERE ARE 10+ SWITCHES TO FAIL HERE THIS YEAR.
FRONT AND REAR./
DOORS CAN BE SOME TIMES
MY CAR THE USER GUIDE TELLS YOU HOW. TO NOT SET ALARMS.
ON SOME CARS JUST USE THE METAL KEY TO LOCK THE DOOR AND AND ALARMS ARE NOT ENABLED, RTM READ YOUR USERS GUIDE FIRST
YES SOME CARS THE SILLY ALARM DOES NOT TELL YOU WHICH DOOR SWITCH FAILS ,JUST THAT 1 IN 10 DID. 1 FOR LIFT GLASS
YES A HUGE PAIN REPLACE ALL SWITCHES 1 BY 1./
BUT IF MUST GUESS TRY DRIVES DOOR SW FIRST, IT GETS HARD USE.

FIRST MAKE SURE FOBS ARE NOT BAD GOING TO PINIC MODE
TO DO SO, TAKE OUT FOB BATTERY
OR WRAP THE FOB IN KITCHEN ALUM FOIL.
OR FIND STEEL COOKIE BOX AND PUT ALL FOBS IN THE CAN
THIS FORMS A FARADAY GAGE
ALSO A FOB BAD OR ITS BATTERY WEAK CAN BE IT.
SO GO TO BED WITH FOBS ALL IN A TIN BOX. SEE IF IT ENDS PAIN.

MANY CARS THE USERS GUIDE EVEN HAS SPECIAL MODES
LIKE NO HEAD LAMP FLASHING EVER,(BY ARMED OR ALARM)

JUST HAD 1 FOB HERE THAT WENT BERSERK
OPENS TAIL GATE GLASS A 1000 TIMES AS WE SLEEP!
AND DOING SO BATTERY NEW FAILS FAST. GOES WORSE.
THE BUTTON IN THE FOB IS SHORTED AND CAN NOT BE REPAIRED.
ONLY A NEW FOB.



CHAPTER 3 IN YOUR MANUAL STATE( AND IS NOT CLEAR)
USERS GUIDES ARE WRITTEN BY KLINGONS.
Alarm deactivation The alarm can be deactivated in the following ways.
By using the remote control transmitter to lock or unlock
the door or to open the trunk lid.
Turn the ignition key to the "ON" position.

Disarmed stage The system will be disarmed when either of the following steps
are taken:
1. All doors are unlocked by the remote control transmitter.
2. The ignition key is turned to the "ACC" or "ON" position.
3. If the UNLOCK button is pressed when all doors are
closed and no door is opened within approximately 30
seconds, re-arming will automatically occuR.

I'D ASK THE DEALER FOR HELP. OR ANY ASE SHOP TOO.
IF THE SCANS TELL WHAT FAILED WHY WOULD YOU WANT TO MISS THAT?

on my car locking the door with key only , alarms are not active. finding this out on mitsubishi is not easy.
some galant's have hood switch and if bad or not aligned
boom
justanswers said

The only methods to disarm the factory alarm is to either use the wireless remote to unlock the doors while the alarm is going off, or use the key to unlock the car twice, either using the drivers door or the trunk lock.

There is no other disarming procedure. If the lock cylinders do not disarm it, it is possible that both of your cylinder switches are bad.



recap (my hit list) list shorter.
check all fuses
battery main in car 12vdc not weak 12.6v is good or more.
car starts can drives far ,day or night?
horn button not bad, or clock spring shorts, steering col.
keyfobs not bad, (remove all coins for testing) this test assumes the fobs are super bad and must be defeated. now.

see if dash message shows,:door open alarm) <<< 11 switches to fail.
scan the PCM to see DTC related to doors or alarm or horn.
use the metal key to lock door, and not set alarm.
some dealers can disable some features here, ask them.

see next answer base on dead fobs or those gone mad.
consider fob buttons can short and is never fun this. ever.
consider drowned fob (wet inside,) battery out now.

one more from justanswers
lost fobs, or dead ones totally dead/bad or mad.

Then to disarm you will insert the key into the drivers door and turn it twice to unlock. Either the drivers door or the trunk lock can be used for this.

You can not simply disconnect the alarm on this model. The alarm is built into the ETACS (Electronic Timing and Alarm Control System). To disable the ETACS you would lose functionality of your locks, dome light, turn signals, low beam headlights and windshield wiper control. All of these functions are built into the ETACS with the alarm function.
and more....

Fuse 20 (30 amp), passenger compartment fuse panel. See owners manual.

Remove and it will make all power locks and hatch inoperable (electrically) and you will be required to manually lock/unlock all doors and use a key to unlock the drivers door to gain entry into a locked vehicle. The hatch will not operate as it is not mechanical release as are the doors.

If you want only to disable the key pad, you will need to disconnect the pad from the smart junction box... not a task for the average owner. It may also cause a CEL/MIL indication.

If you want to test removing fuse 20, roll down the windows prior so you have access if key entry somehow fails.

You could wire a switch (30 Amp) into the fuse 20 circuit and have a selectable on/off so you have hatch release or all functions when wanted.

To arm content theft alarm.
1. Open the door.
2. Lock the door with the power door lock switch or
the remote keyless entry transmitter. The
SECURITY light should flash.
3. Close all doors. The SECURITY light should go off
after approximately 30 seconds. The alarm is not
armed until the SECURITY light goes off.

If a locked door is opened without the key or the remote keyless entry transmitter, the alarm will go off. The headlamps and parking lamps will flash for two minutes, and the horn will sound for 30 seconds, then will turn off to save the battery power.

What make , model an year vehicle ? Your probably not going to find a quick fix . The car's computer is probably making it blow , U could pull the horn fuse or relay till u can have a repair shop check for trouble code's in the BCM - body control module .

Door Key Switch
The BCM monitors the door key switches in order to disarm the CTD system. When the lock cylinder turns in order to unlock the door, the switch grounds the disarm input to the BCM.
The key lock input to the BCM is probably missing , BCM doesn't see it . So it think's your breaking into the vehicle. Did you try the passenger door to see if it will disable the alarm .
The BCM - body control module ! Electronic -computer !
--------------------------------------------------------------------------------
Content Theft Deterrent (CTD) Does Not Disarm with Key Lock

The factory service repair manual has a 23 step diagnostic procedure . An you would need a factory scan tool to find the correct fix.
Turn ON the ignition with the engine OFF.
With a scan tool, observe the door key switch parameter in the Body Control Module (BCM) security data list.
Does the scan tool display INACTIVE?

Locking the Vehicle Without Arming the System
Use one of the following procedures in order to lock the vehicle without arming the system:
• Procedure A -- Lock the vehicle using the manual door lock knobs. Close all the doors.
• Procedure B -- Close all the doors. Use the key or the power door lock switch in order to lock the door. The doors must be closed prior to locking the doors for this procedure.
Disarming the System
In the arm initiated mode, the following conditions are true:
• The security telltale is ON.
• The doors are open.
In order to disarm a system in the arm initiated mode, perform one of the following procedures:
• Press the power door lock switch to the UNLOCK position.
• Press the door unlock button on the key fob.
In order to disarm a system in the arm delay or the armed mode, perform one of the following procedures:
• Use the key in order to unlock one of the doors.
• Press the door unlock button on the key fob.
Deactivating the Alarm
In the alarm mode, the following conditions are true:
• The horns sound intermittently.
• The headlights and the park lamps are flashing.
In order to deactivate a system in the alarm mode, perform one of the following procedures:
• Use the key in order to unlock one of the doors.
• Press the door unlock button on the key fob.
• If the vehicle control module (VCM)/powertrain control module (PCM) receives a valid Passlock™ ignition key rotation.

Jay, If problems did indeed happen after that shop checked things, return and ask them to fix back to the way it was prior to them tinkering around.

Check to see if your vehicle honks when you press the "lock" button on your key fob. Press the "lock" button multiple times in a row. Many devices won't beep unless you double-tap the button after locking. If the horn doesn't honk, but the lights flash, your chirp feature is probably disabled.

Use your keyless fob and ignition key to enable the audible chirp. The process varies considerably on different makes and models. You must usually consult your owner's manual, a dealership or the alarm manufacturer for the correct process.

Sounds like the body control module is going bad. Need to be sure, not cheap.

I would start by replacing the FOB. Sounds to like the electronics inside it are bad. The only reason the horns would go off is if you hit the panic button. There is a slight chance the receiver is bad. But Fobs are cheaper to replace than the receivers. If you have two FOBs and they both react the same, then replace the receiver. Or just ditch the system. The keys (in the door locks) should still activate the alarm system.

there are two seperate horns