# 2010 Mazda Mazda3 - Electrical glitch sets off alarm and more **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** mazda\ **Created:** [May 13, 2024, 6:14pm UTC](https://community.cartalk.com/t/2010-mazda-mazda3-electrical-glitch-sets-off-alarm-and-more/194894 "2024-05-13T18:14:07Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![hessiebell](https://avatars.discourse-cdn.com/v4/letter/h/b5ac83/32.png) [@hessiebell](https://community.cartalk.com/u/hessiebell)\ **Post date:** [May 13, 2024, 6:14pm UTC](https://community.cartalk.com/t/2010-mazda-mazda3-electrical-glitch-sets-off-alarm-and-more/194894/1 "2024-05-13T18:14:07Z")
2010 Mazda 3 Sport GX Auto Car alarm (lights, horn) goes off randomly, then stops (battery checked, all good). Also, door-ajar dash light and interior dome light will go on while driving - hitting door lock button with turn both off. How do I fix this? I’ve just removed the horn fuse so at least it’s not annoying the neighbours, but the issue still occurs. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [May 13, 2024, 7:54pm UTC](https://community.cartalk.com/t/2010-mazda-mazda3-electrical-glitch-sets-off-alarm-and-more/194894/2 "2024-05-13T19:54:30Z")
> [@hessiebell](#): > > door-ajar dash light and interior dome light will go on while driving There is a malfunctioning door ajar switch. If the security module detects a door ajar while the alarm is set, the alarm will sound. Identify which door is causing the door ajar warning and replace that switch or door latch. ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [May 13, 2024, 9:09pm UTC](https://community.cartalk.com/t/2010-mazda-mazda3-electrical-glitch-sets-off-alarm-and-more/194894/3 "2024-05-13T21:09:58Z")
Concur, and it is probably the driver’s door switch that’s gone faulty.