Q: Disable or bypass factory security system

asked by on February 09, 2017

We have a factory security system that acts up on us. Sometimes I'd try to unlock the doors after arming the system and it will only unlock one door and I get in, the car won't start. The security system stays armed. I'd like to disable the system so that the car will start. How do I do this?

My car has 150000 miles.
My car has an automatic transmission.

Electrical components are not working Inspection $79.99 - $89.99 Get a Quote

To temporarily override the system, see these instructions. A permanent bypass requires re-engineering the system because engine immobilizers these days rely on multiple electronic modules and chips, the very removal or modification of any one of which, or reconfiguration, will itself activate the immobilizer. These immobilizer systems are complex and nearly foolproof to all but highly trained electrical engineers and even they will have trouble due to the need for specialized components, programming and so forth. That’s why these systems have been so effective of late in preventing car thefts. Immobilizers are essentially undefeatable unless you want to spend many, many hours poring over circuit schematics to design a unique bypass strategy. The bottom line is, in your circumstances it will be vastly easier, more efficient, and less costly to simply fix the immobilizer system that you already have in place. Indeed, the Factory Service Manual has a diagnostic protocol to accomplish just that. To that end, if you request a system electrical diagnostic a certified Mechanic, dispatched by YourMechanic right to your location, will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

What others are asking

Car will not shift gears, stuck in neutral.

Hello - your symptoms suggest a failure or disconnect of the shifter linkage to the transmission (whether cable or mechanical linkage). Most likely, this is external to the transmission, and can be repaired without having to get inside the transmission....

Car won't start at all - 2000 Nissan Maxima

Regarding the fuse, the high current probably welded the fuse to the fuse holder. YourMechanic can attempt to salvage the assembly by trying a fuse replacement without destroying the fuse terminal box. If you are lucky, putting a new fuse...

Lots of rust on a newish car, what happened?

Unfortunately, there is no stop to rust. It happens to all cars that are regularly exposed to the elements, but some parts of the country are worse than others. But don’t worry, Nissan is aware of the issue and has...

How long can I drive on a cracked coolant reservoir in the winter until there’s damage to my engine?

The volume and pressure of the engine coolant increases as the engine warms up. A purpose of the recovery tank is to serve as a temporary holding spot for the overflow of coolant that occurs both during engine operation and...

P0430 code. Should I replace the catalytic converter?

Hello and thank you for contacting YourMechanic. Check for any exhaust leaks in the exhaust system. If there is a slight ticking sound or a light to loud rumble, then there is a possible exhaust leak. Check the O2 sensors...

What cause a catilac converter in 2009 nessain murnao go bad

There can be a few different reasons for a catalytic converter to fail. Your engine running too rich or lean or coolant in exhaust from a blown head gasket can cause failure. Also a defective converter that breaks apart and...

My check engine light came on. Took it to Autozone and they came up with this code PO156. What is that

Hello, thank you for writing in. A P0156 troubleshooting code stands for an error with the oxygen sensor. There are multiple sensors, and this one is behind (further towards the rear) the catalytic converter. Several things may be happening. First,...

Why would my Nissan Maxima make loud humming noise when I accelerate up 55mph but noise stops or gets softer at 60mph.

It sounds like you may also need to change the right front bearing as well. Bearing damage usually happens slowly over the course of days or weeks or maybe even months. You may notice the noise getting louder and louder...

Exhaust was cut off and I need to repair it. What do I need?

As long as the vehicle has a catalytic converter and muffler, you can put what ever pipe you want on the vehicle as long as the pipe is not near any fuel tanks, electrical wiring, and any brake lines. It...

Related articles

The Best Used Cars to Buy If You’re an Electrician
As As an electrician, you have to haul around wiring, tools and equipment, and tons of supplies. You can’t get by with a small used car, or even a big one. What you probably need is a good used cargo...
The Top 5 Selling Cars in Alabama in 2012
2012 2012 was a great year in Alabama for auto manufacturing, but that wasn’t the only bright spot. Vehicle sales in Alabama were also robust in 2012. Nothing much changed in terms of the vehicle types that were most popular...
The Best Used Cars to Buy If You’re an Interior Designer
As As an interior designer, you need to transport a great many different items, including fabric, paint and wallpaper samples and sometimes even furniture items. You probably don’t handle overly large loads very often, and when you have to, you’ll...