The door latches and door switches can get dirty and rusty too which can cause issues, so the first thing you should do is give all door latches a good clean and spray some WD-40 on the latch and work it in to see if that helps.Īlso check the wiring leading from the body into the door for any signs of damage, it should be in a flexible hose on the hinge side of the door. Similar to the hood switch, these switches monitor the open/closed status of the door – if damaged, faulty or dirty they can send false readings to the alarm system’s computer thereby triggering the alarm.ĭoor switches (or sensors as they are also known) are a common point of failure as they are subject to wear and tear due to the doors being continually opened/closed/slammed etc. Faulty Door Switchesįaulty door switches aka sensors are another common cause of random alarms on the Tacoma. At night with the rapidly cooling temperatures, enough contraction of the material has occurred to open the sensor and thus make the ECU think someone popped your hood open whilst it was still armed.” – r/ToyotaTacoma subreddit 2. During the hot days, the material has expanded enough to likely still cause full contact with the sensor thus showing your hood is closed. “Sounds like it could still in fact be a bad hood latch assembly sensor. “If the truck/alarm has a hood pin switch so that the alarm sounds when the hood is opened the pin switch could have worn down and/or rain water is in the switch.” – Otherwise, we’d advise visiting your local mechanic. If you are well-versed mechanically, you can buy a new hood switch online and replace it yourself. You can test the switch with a continuity tester.Give the hood switch a clean too (use contact cleaner), as dirt and grime can cause issues. Check for any obvious damage, rust or loose connections.Pop the hood and locate the hood switch.The small electronic device is designed to detect whether the hood is open or shut and is an important part of the car’s alarm system – if it is broken, loose or dirty it can send false readings to the car’s computer thus triggering the alarm. The switch is typically embedded in the hood latch. Faulty Hood SwitchĪ faulty hood switch is a very common cause of unwanted alarms for a number of Toyota vehicles and the Tacoma is no exception. Other common causes include battery problems, key fob issues, and an incorrectly installed aftermarket alarm system. Why Does My Toyota Tacoma Alarm Keep Going Off?Ī Toyota Tacoma alarm is usually triggered by a faulty door or hood switch. Why Does My Toyota Tacoma Alarm Keep Going Off?.
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