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sprinkles08, ASE Certified Technician
Category: Toyota
Satisfied Customers: 22664
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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My 2009 Prius antitheft alarm keeps going off, No, I'm just

Customer Question

My 2009 Prius antitheft alarm keeps going off
JA: Have you tried locking and unlocking the driver's side door using the key itself?
Customer: No
JA: Are you fixing your Prius yourself? What have you tried so far?
Customer: I'm just trying to get through the night without it honking all night
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
Submitted: 9 months ago.
Category: Toyota
Expert:  sprinkles08 replied 9 months ago.

Hello and welcome to JustAnswer!

If it's the factory alarm going off it's because it is seeing a door, the hood or trunk opening. Factory security works by watching the ajar switches and if it sees one of the circuits close without the alarm being disarmed then it will go off.

The problem could be wiring or a door that isn't closing correctly, but it's more likely that you have a bad ajar switch.

Customer: replied 9 months ago.
Is that expensive to change ?
Expert:  sprinkles08 replied 9 months ago.

No, it shouldn't cost more than $100 to diagnose and repair it if you have a bad ajar switch.