Skip the auto shop - Our mechanics make house calls

Q: Car Alarm goes off when driving - 2012 Toyota Corolla

asked by on

I recently bought a preowned Corolla, the car worked like a dream, until the Toyota Dealership installed a car alarm.

When I first got it back it ran a little different, at first the steering wheel was a little loose, but that I fixed and is now the least of my problems. I noticed that the alarm light was never on, about a week later, I go to drive it, I do nothing differently. I turned on my car and when I put it in drive or reverse or neutral, I hear an extra beep like the alarm is armed. And now when I drive, it beeps a couple of times as though it's warning me, and then it goes ballistic and the alarm goes off.

I've tried everything in the manual but nothing seems to work, do you have an idea of what it might be? (Please note that sometimes I do press the LOCK button twice when I'm unsure if I've locked the car) Also another question is, is there anyway the dealership could take out the alarm and make it the way it was like the day I bought it?

My car has 69000 miles.
My car has an automatic transmission.

Hi and thank you for contacting YourMechanic. Car alarms are tricky and can drive people crazy. To my knowledge, there are several ways that the car will arm the alarm with the key in the ignition. Go around the vehicle and check all of the doors, trunk, and hood. Make sure that they are all closed. The alarm will sound if the hood is not latched correctly, the trunk is not secure and moves around, or if a door is in the first latch position leaving it unsecured.

There may be safety switches mounted on the doors, trunk, and hood to keep you safe. If everything is secured and latched, then there may be a loose wire from when the dealership installed the alarm. The dealership must have hooked the alarm up to the ignition switch, for the reason your steering wheel was a little different. When they did that, they might have crossed some wires on the ignition switch.

As far as the other question, you can have any car alarm removed as long as it is not installed into the computers wiring harness. This means that aftermarket alarms are add on’s as to where the factory alarms are integrated into the entire vehicle. If you are still having trouble with your car alarm coming on while you are driving, I would recommend taking the vehicle to the dealer to have the system inspected.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Tachometer has been stuck at maximum since winter started

Miniature stepper motors are often used in the tach application to position the pointer. If so equipped, the stepper motor is soldered onto the cluster PCB. It is not too difficult to remove them, and solder in a new one,...

Q: how do you disconnect the car alarm on a 1996 Nissan Pathfinder?

Hi and thanks for contacting YourMechanic. Disconnecting an alarm to your vehicle depends on which alarm you are removing. If you are attempting to remove the alarm that is built within the factory settings, then that is not possible for...

Q: Theft light cant start car

The theft system on you car requires the key to be a programmed key to turn off the theft system so you can start the car. If you have the original key then disconnect the battery and connect the cables...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...