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I have a 99 blazer and the security system is keeping mefrom starting it i don't know what the passcode is so how do i reset the security system?

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  • Cars & Trucks Master
  • 2,359 Answers

Use your spare key and try to start the truck.

The worn / original key has a BLACK RESISTOR on the side.

GM PassKey is not a well design product.

It was made to keep the insure rate down for GM car buyer.


The chance are this BLACK RESISTOR got knock out,missing or the contacts to this resistor is very dirty/WORN.

Give the steering column and the contact points a good cleaning.

Example: pass a vacuum hose over the key hole for few minutes and wipe down with DRY cotton cloth.


Please let me know does it help.

Posted on Jul 11, 2010

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The security light means the computer is not reading the chip in the key.
You should have a sensor in the key lock and a chip on the key programmed for the security system.
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Also security light stays on solid (no blink) weather key is on or off. Cannot reset security system at all.
Have the vehicle check by a qualified ASE certified repair shop .

Mar 09, 2017 | 2000 Chevrolet Blazer

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99 Chev Blazer security light came on


Very common GM problem.
Put key in ON position (do not start) for EXACTLY 10 minutes. As SOON as the light turns off, then IMMEDIATELY start the motor

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Starting Problems AGAIN


Personally, I would return it to the dealer and state that is still not fixed.
When the remote start / security system was removed or disconnected, the starter circuit would have had to be rewired as the remote start / security system prevents the starter from engaging.
The wire splicing that would have had to take place may still be a problem.
If you would rather diagnose this problem your self I will be happy to help.
Let me know.
Regards,.

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fuel filter is acheap part ur car needs and it cause the same, or coil can go out slowly. take it parts stare to have it checked good luk claymister

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