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Lurch, Aftermarket & Factory Electronics
Category: Car
Satisfied Customers: 20953
Experience:  Ford, Chev Cert, Heavy Line Mech, Mobile Electronics.Sales, Installation & Repair for 30 years.
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Security alarm went off and we cannot disable it to start the engine

Customer Question

Security alarm went off and we cannot disable it to start the engine
Submitted: 9 years ago.
Category: Car
Expert:  Lurch replied 9 years ago.


Be sure Battery is Fully Charged
Disconnect Positive Battery Cable
Open Drivers Door & LEAVE Open
Turn Ignition to ON Position & leave On.
Reconnect Positive Battery Cable.
Horn may sound for a few seconds.
Start Car.

Lurch and 8 other Car Specialists are ready to help you
Customer: replied 9 years ago.
Relist: I still need help.
The code you gave didn't work. Please help!
Expert:  Lurch replied 9 years ago.

If this is a Factory Alarm, the Battery is Fully Charged & If the above did not work, then the Alarm Unit is defective & will need to be Repaired or Replaced.

If the Vehicle Theft Security System module is being removed and no replacement module is being installed, the module wiring must be disconnected while the engine is running. Failure to do so will cause a no-start condition.


Remove upper right instrument panel silencer.
Remove glove box assembly.
Remove screws (4) attaching mounting bracket to instrument panel.
Disconnect wiring.
Remove screws (2) attaching module to bracket
For Installation, reverse Removal procedure.

Customer: replied 9 years ago.
Thank you.

Have not tried removing the module yet, but intend to do that. An auto repair friend suggested we try removing the negative battery cable (not sure how long to leave off, but it was 15 min. in this case),locking and unlocking the driver's door 3 times. This worked, so the car now starts. Which was a problem with your above resolution--couldn't start the car to disconnect the module wiring.

I'm clicking on "accept" because that is the only option given to get this to you, but it is my understanding there was only one charge--is this correct?
Expert:  Lurch replied 9 years ago.

Yes, & I am glad you got it fixed. Computers Usually loose their Settings on Removal of Positive Cable, but retain Memory. So when you Removed the negative Cable it erased everything. Hope it works for you.


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