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Car alarm reset

How do I disable the hood ajar sensor on my 05 STS?

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Take the wire off and link them together but would fix it as it can make you insurance void if the car is stolen.

Posted on Oct 15, 2013


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Posted on Jan 02, 2017

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SOURCE: hi my 05 corolla factory alarm control dosent work

I would love to help you but your basically asking how to steal your own car and others might use the information for illegal purposes so i suggest you get it towed to a stealership (dealership).

Posted on Jul 04, 2009

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SOURCE: How do I reset factory alarm on a 2000 Subaru

you HAVE to get a remote and unlock the car.the dealer may be able to turn it off with the obd2 system,you have to call subaru.

Posted on Jul 13, 2009

  • 462 Answers

SOURCE: instrument cluster indicates door ajar but there is not

The door latch has a switch built into it to replace the old door jamb switch. If the switch is faulty the system will think the door is ajar. A scanner will show an open switch.


Posted on Aug 08, 2009

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SOURCE: door ajar sensor will not turn off and all doors

I assume all the doors are undamaged and closing all the way?
Check each door individually/one at a time, with the remaining doors closed.
Open one door at a time and locate the Plunger on the Frame of the car. Push that plunger all the way in and look at the dash light to see if the door ajar light goes out. Repeat with the other doors to identify which sensor is failing.
You may have more than one failing, which requires either taping (duct tape) one or more pushed in OR having someone helping you push them in - in pairs.
After locating which one(s): Remove them from the frame and inspect the wires and connections.
Some plungers are adjustable in that they can be "unscrewed" out to increase their lengths. Most however are not adjustable.
If the plungers do work at a point - further than what the door closes:
a) use a makeshift spacer (gasket material, metal) that goes between the back of the sensor and the frame. You have to take into account the opening into the frame and the metal scew holes.
b) use a spacer (like a taped quarter(s)) on the door where this plunger makes contact.

The other cheapest way after identifying the malfunctioning switches is to contact a local Junk Yard/Auto Salvage Yard and find out if they have your Year/Make/Model and getting the parts from them.

Let me know if this helped, or if you have additional information or questions. Feel free to contact me at

Posted on Feb 24, 2010

  • 79 Answers

SOURCE: our mercury mountaineer door ajar sensors keep

you need to find out witch door jam switch it is they are about $40 each you can take a ohm meter and check the electrical connection. place the wires on the pins with it open then check when you press the button to make sure that the numbers change if no change on the ohm meter then that is the bad door switch

Posted on Apr 07, 2010

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How to check why my car alarm in 2006 nissan altima is not working

If it aftermarket(bunch of wires and modules under the dash on the drivers side) remove it. If it is still factory it takes a scanner.

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The alarm randomly comes on for no reason, would this be related to the BCM? If not what could it be?

Some of the sensors are going bad or are too sensitive. A motion sensor or lock sensor can be intermittently setting it off. Do you have access to a scan tool ?

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check the door jamb sensors and the hood and trunk open sensors one could be bad causing thr security system to engage are all of the doors locking when you press the lock does it say trunk ajar? ckeck under the hood as well because if the car thinks the hood is open the security may trigger also because thieves can pop the hood anddisconect the battery so some cars have a hood pop sensor they should look like a button somewhere near the front

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The alarm goes off by itself..I am no where near the key

very old post... choices?? i will try to help others fix ALARMS.
Jeep WK. 2005 to 2010
what id do? , is never set it. or defeat it. (ask)( the oper,guide tells this)

but if it MUST work than it must be fixed.
the dealer would use a scan tool , see no errors and replace something exensive, then it fails again. the endless story of alarms.
in your case he'd install the TSB fix first.
He'd use a DRBIII scan tool to find the offending input.
The BCM (body puter ) gets the sensor inputs belowL

The BCM receives the ajar switch signals on the following circuits.
  • Circuit G75 provides left front door ajar switch signal
  • Circuit G74 provides right front door ajar switch signal
  • Circuit G77 provides left rear door ajar switch signal
  • Circuit G76 provides right rear door ajar switch signal
  • Circuit G78 provides liftgate ajar and liftglass ajar signals.
the hardest problems are always intermittants.
Intermittent alarms and stalling engines, tops list.
finding it? , with out sleeping in the car is a big problem.

also there is TSB on this.
Swing gate open alarm.

the hard part, is finding out which inputs is (was) failing.
in my car i can find it with a scan tool .
newer cars store the failed input in the PCM memory. as a DTC.

In my shop I have a CAN-BUSS monitoring tool that allows me
to see live AJAR messages and logs them to the laptop, HDD.
for later analysis. (ok the lift gate failed at 3am, bingo)
my 2008 logs, DTCS like this.
B1820-HOOD AJAR INPUT CIRCUIT HIGH (and all others)
i have a scan tool that can see that , called a innova 3160
a $200 tool,
I have 2 ways to find intermittent in my newer jeep

2006; WK?
FSM quotes with comments.
1. Perform VTSS Verification Test
  • Open the driver door and roll down the window.
  • Remove the ignition key (but keep in hand).
  • Lock the doors with RKE transmitter or power door lock switch.
  • Ensure all doors, tailgate, and tailgate flip-up glass are closed.
  • If the VTSS Indicator Lamp flashes rapidly and after approximately 16 seconds changes to a slower flash, the system is operational. However, If the indicator fails to flash as described, there is a problem with the system.
  • comment: gee, attempt to rattle all doors, and see if VTSS sees a failure. all doors, lift gate and hood, (if car has hood switch)
the FSM shows the B1xx and B2xxx codes for alarms.
only a scan tool can do that. mine can,
you can also rent cheap CAN-BUS scan tools, from most good
that should cover most alarming issues.
but here is one better for older jeeps.
see matrix table for coverage by body type.

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I have a cadillac sts 2005 and my car just started showing this sign saying "Hood ajar" "service theft system" out of nowhere . But no one has try to brake in my car cause my car is in a garage and th

I would suggest you have someone check the hood sensor. There is a sensor that tells the computer the hood is open much like when a door is not closed.
Anytime a sensor like that fails, the computer will think someone has cut the wires or otherwise disabled the sensor.

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Acura TSX '05.... My factory alarm turns on randomly.. How do I disable it?

Jump the wires going to the hood switch, (car will think hood is open and alarm won't set)

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Hood a jar keeps going off and security alarm going off at night,theft attemped alarm.Service theft system alarm/2005 STS

have you been in accident lately? you can reset the cars computer by disconnecting the positive side of the battery for 10minutes. be sure you do not need code to reset the cars stereo! if no code needed,reset your computer. be sure to have keys in hand when you do this. you'll need those to gain entry into your vehicle when system is reset. also make sure you push in on car hood release after you shut your hood. this may help you. thank you for choosing we are here 24/7 7days a week!

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Car alarm went off reset went off again within 3 min had tomanual lock , dome light on while driving

it sounds like you have a door open that is why the light is on. it may not be a actual open door but a faulty door ajar switch. that would explain why the alarm keeps going off. i would start by opening and shutting all doors includingthe hood and hatch.
if that does not fix it-a gm dealer with a tech 2 scanner should be able to located which door ajar switch is bad.

Aug 11, 2010 | 2003 Saturn VUE

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97 bmw 528i factory alarm goes off for no reason

disable the hood microswitch. just unplug it. That and the cabin sensor are the most probably reasons the alarm will go off.
Alarms are useless. Totally effin useless. So it goes off.....then whaddya going to do. Shoot someone? Call the police? or listen to it drain the battery over and over again. can't disable the alarm totally. The bmw engineers have tied it into the main computer. you can however disable the sensors one by one so it doesn't set off the alarm. Hood sensor....Hood sensor....that's the culprit.

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