The Anti-Theft System Won’t Let My Car Start一What Should I Do?
Anti-theft car systems work by flashing lights or sounding an alarm when someone breaks into the vehicle. Depending on the manufacturer, an anti-theft system can disable certain components that help start the engine. However, it can trigger or malfunction even when nobody’s breaking into the car.
A vehicle that won’t start is one of the most common symptoms of a bad anti-theft system, and this problem can be a bit complicated to resolve.
Getting Around a Malfunctioning Anti-Theft System
If you’re sure that the service theft deterrent system is the reason why your car won’t start, here are a few things you can try.
Replace Your Key Fob’s Battery
In some cases, it only takes a simple battery change to resolve this problem.
The key fob’s battery could have messed with the signal after running out of juice, preventing the system from reading the security code.
Use the Mechanical Key
Your car’s mechanical key can be used to disable the anti-theft system.
Turning the key up to the “on” position for a few minutes can cause the anti-theft system warning light to go off and get your car to start.
Inspect the Affected Components
First, make sure that the parking and low-beam headlights, dome and courtesy lights, horn, and electric door locks are all working as they should.
On most vehicles, these components send various signals to the powertrain control module (PCM), alerting it whenever there are issues like a missing signal and out-of-range signals.
If the PCM can identify an issue because of the signals from these components, it can disable the anti-theft system and log a diagnostic trouble code (DTC).
If all the components are operational, make sure all their switches are in their normal on and off positions via voltage drop tests. Doing so will help you identify the faulty parts and circuits.
The diagnostic and repair procedures might require extensive automotive repair knowledge, so if you’re not familiar with resolving trouble codes, it’s best to leave the job to a professional mechanic.
Accessing the Anti-Theft System
Car dealers or certified repair outlets might be the only ones who can access your vehicle’s anti-theft system, depending on its year, make, and model.
Most factory-installed anti-theft systems require specific scan tools that can be quite tricky to use if you’re not familiar with the diagnostic process.
Most vehicles with an anti-theft system come with ignition keys with a coded transponder chip that sends a signal to the receiver in the ignition switch.
If the anti-theft system sends a no-go signal to the PCM, the engine computer will disable the ignition, fuel system, or starter.
Diagnosing a Faulty Anti-Theft System
Most anti-theft systems are integrated with other electrical circuits to form a multiple-circuit system.
So when it comes to diagnosis and repair, it’s important to have make-model-specific wiring diagrams and test procedures. These will help you break down the system into subcircuits and identify the faulty component.
Other Anti-Theft Devices to Check Out
Factory-installed anti-theft systems act as immobilizers and keep your vehicle safe from thieves. But if your car doesn’t have one, you might want to check out these foolproof devices.
Steering Wheel Brake Lock
This device locks the steering wheel to the brake or clutch pedal to immobilize the vehicle. A steering wheel brake lock is made from hardened steel, so a hacksaw or power drill can’t break it.
Wheel Lock
The wheel lock works like the standard tire clamp. It prevents one of the wheels from rotating, keeping the vehicle parked in the same spot.
Faraday Bag
A Faraday bag is a small pouch that blocks electromagnetic fields that come from keyless entry systems. It’s suitable for drivers who have keyless entry systems in their vehicles, as it blocks an electronic signal that can unlock vehicle doors.
GPS Tracker
There are GPS trackers that fit onto OBD ports and provide your vehicle’s real-time location. Although a GPS tracker can’t prevent thieves from taking your car, it does come in handy when tracking your vehicle’s whereabouts.
Vehicle Theft Prevention Tips
Anti-theft systems and devices can only do so much. So, as a car owner, you must be thorough when it comes to keeping your vehicle safe. Aside from anti-theft devices, you can follow these practices to prevent theft.
Always Take the Key with You
Many drivers like to leave the engine running while they make a quick run to the restroom or nearby store, increasing the risk of someone breaking in and stealing their car.
Always take your key with you wherever you go to prevent this from happening.
Park in Well-Lit Areas
Parking in well-lit areas makes it risky for thieves to do something fishy. Doing so also makes your vehicle visible to bystanders.
Double-Check Doors and Windows
It pays to double-check your doors and windows whenever you leave the vehicle. Ensure all the windows are pulled up and the doors are locked.
Don’t Keep a Spare Key in Your Car
Thieves will always try to look for a spare key inside your car once they manage to break in. Keeping one in your glove box will make it easier for them to steal your ride.
The post The Anti-Theft System Won’t Let My Car Start一What Should I Do? appeared first on In The Garage with CarParts.com.
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