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.

A: Hi and thank you for contacting YourMechani...

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: How heavy of a trailer can I tow?

Unfortunately, it is not recommended that any trailer be towed with this vehicle.

Q: When I set the alarm only the left side indicator lights flash, the right no light flash. the alarm work OK.

When the alarm was installed the alarm output wire for the lights need to be tied into a parking light circuit or turn signal circuit. Whom ever installed your unit hooked the light output wire to only the left turn...

Q: How do I set the security alarm?

The security alarm is a key safety feature that helps keep your car from being stolen. When someone enters your car without a key or the remote transmitter, the security alarm will activate, and the horn will honk and the...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.