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Security light

How do I disable the security system in a 99 sierra

Security light

Postby tplal05 [OP] » May 31 2011, 2:44am

Hello all,
I am new to the forum and was wondering if anyone know how to fix a 99 sierra that has a security light that comes on and my truck wont start?
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Re: Security light

Postby Chasmanian » May 31 2011, 3:33am

Did you buy the truck new or just pick it up by chance?
Buying things I don't need to impress people I don't know.
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Re: Security light

Postby tplal05 [OP] » May 31 2011, 12:47pm

I purchased the truck last may. It only had 50K on it and was in nice shape. There is an aftermarket remote start (I think)under the dash with relays but there is no name or # on the unit I can find. I was hoping adding a new remote start unit to the truck might be able to override the factory security system. Problem is the truck will leave me stranded and there is no warning sign. Sometimes if i use a different key it will start. Other times I have to let it sit for hours before it will start.
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Re: Security light

Postby Chasmanian » May 31 2011, 6:21pm

There is some type of mod between the remote start and the key cylinder to trick the vatts into thinking the key is in the truck while remote starting. If it is going bad it will throw the truck for a loop and not let it start. You could swing by any good Stereo shop and have them check it or just remove it.
Buying things I don't need to impress people I don't know.
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Re: Security light

Postby tplal05 [OP] » Jun 03 2011, 2:10pm

Thanks for your help. I have an appointment at the stereo shop Monday morning too have the old unit removed and a new unit installed. i think the ignition is going to need replaced also but they are going to look at that on Monday also. Thanks again!
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Re: Security light

Postby Chasmanian » Jun 03 2011, 7:02pm

Good luck and hope all turns out for you. The ignition should be ok as they just have to tag a few wires for the alarm.
Buying things I don't need to impress people I don't know.
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Shifting into Second Gear [L3]
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Posts: 1294
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Joined: Jan 31 2011, 7:48pm
Years of membership: 1 year of membership
Location: Oklahoma
Year: 2007
Make/Model: GMC Sierra
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