Question about GMC Sierra 1500

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Where is the fuse for the security system on a 2001 GMC Sierra 1500?

The truck is stone dead. But the battery (one year old) has juice. No click when you turn the key, no lights in the cab or dash. The yellow "security" light flashed, and there was some clicking before it went dark. When I put the amp meter to the terminals of the battery with the cables connected, the numbers jump all over the place. when I disconnect the cables, the number stays in one place.

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The security system receives it's voltage through the BCM (Body Control Module)

To check the security system schematic complete the main page of the link below by selecting:

(Wiring Diagrams)

Enter your vehicles
(Year): 2001
(Make): GMC
(Model:) Sierra 1500
(System:) Body And Accessories
(Sub System:) Security/Anti-Theft

1 diagram found.

The first step is to always perform OBDII Diagnotics to see if any fault codes are logged.

Here is the ignition switch relearn procedure compliments of

found this helpful answer from gm mechanic on JustAnswer com

Turn ON the ignition, with the engine OFF.

Attempt to start the engine, then release the key to ON, vehicle will not start.
Observe the SECURITY telltale. After approximately 10 minutes , the telltale will turn OFF. The vehicle is now ready to relearn the Passlock Sensor Data Code and/or password XXXXX the next ignition switch transition from OFF to CRANK.
Turn OFF the ignition, and wait 5 seconds .
Start the engine, the vehicle has now learned the password.

PS: Your owners manual should also provide you with useful information on your security system functions and programing.

Posted on Aug 12, 2017


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Posted on Jan 02, 2017

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SOURCE: 2002 dodge ram 1500 flashing red light and dead

When you disconnected the battery, you tripped the alarm which locked down everything. In your owners manual, look under the security or alarm system. It will tell you how to disarm your particular alarm system. If I am not mistaken on these you put the key in the drivers door and lock and unlock it 2-3 times. If you do not have the owners manual, you can contact dodge and they will walk you through it.

Posted on Apr 10, 2009

  • 1 Answer

SOURCE: Will not start or turn over. Red light flashing on

It's the battery same thing happened with my truck. I changed the battery and the problem was corrected.

Posted on Jun 26, 2009

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SOURCE: 2005 jeep cherokee won't turn over - security

this vehicle is equipped with a factory alarm system i should deactivate with your remote switch or if you never used remote switch them the chip on the key remote is defective and you need a new key or reprogram the old key I hope this information has been useful good luck

Posted on Jul 26, 2009

  • 1 Answer

SOURCE: cadillac 2004 cts, wont start

i had a 2003 ctc that did the same thing, it wouldn't start or would make a clicking sound and about 1 mth after the problem started aND mechanics could not find a problem my car caught on fire and burned completely from something under the right side of the hood. i had just parked the car and got out, it happened really fast. the fire chief said the cause was unknown????

now i have a 2004 cts and i'm having the same problem!!!!!!!!!!!!!!! has anyone else had this happen???? please be cautious if your cts is doing this, during the fire my doors locked and had to be pried into by fire chief.

Posted on Aug 22, 2009

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SOURCE: security light blinks on dash , truck wont even try to start

Does your key have a chip on it? If it does its probably the problem

Posted on Aug 23, 2009

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