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Security light on my dash keeps flashing

Tiny
JLBERGMAN
  • MEMBER
  • 2001 CHEVROLET S-10
I have a 2001 chevy s10 blazer. I removed the battery and several hours later I replaced it. Now the security light on my dash keeps flashing, the radio is in LOC mode and it will not start. Do I have to reset the fuel pump relay or is it something else?
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Saturday, January 22nd, 2011 AT 2:22 PM

11 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
You can try the procedure below for passlock security, to see if vehicle will start and run.

The other procedure is for radio loc, without that code, you may have to contact dealership.
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Saturday, January 22nd, 2011 AT 4:53 PM
Tiny
GLEN DENNIS
  • MEMBER
  • 1 POST
  • 1999 CHEVROLET S-10
  • 4 CYL
  • 2WD
  • MANUAL
  • 200,475 MILES
Electrical problem
1999 Chevy S-10 4 cyl Two Wheel Drive Manual 200475 miles

my truck wouldnt start. The starter was making noise. My wife turned the key and I hit the starter with a hammer. It started up. This morning I had to use a screwdriver to start it while my wife turned the key. The security light stayed on. When I got to work I turned the truck key off. It started right back up and the security light is off. Whats going on. My manual said something about a passlock.
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Saturday, November 18th, 2017 AT 1:42 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Passlock doesn't interfere with the starter. If tapping on the starter made it start cranking, that's an indication of a bad starter.
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Saturday, November 18th, 2017 AT 1:42 PM (Merged)
Tiny
BOBBY BOY
  • MEMBER
  • 1 POST
  • 1999 CHEVROLET S-10
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
Other Category problem
1999 Chevy S-10 4 cyl Two Wheel Drive Automatic 130000 miles

I've been having problems with my truck. Sometimes it will start fine and other times it won't start at all. The security light sometimes blinks on the dash. Is this a passlock security problem? If so, how do I fix it, if not what could it be?
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Saturday, November 18th, 2017 AT 1:42 PM (Merged)
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
Yes this is pass lock problem. Ive been changine alot of ignition cylinders lately. You need to bring you registration, drivers license to dealer to get parts. Once you replace cyl you must reprogram the new parts, its easy. Let us know if your going to do this and we can walk you through reprogramming sequence.
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Saturday, November 18th, 2017 AT 1:42 PM (Merged)
Tiny
VIOCMF
  • MEMBER
  • 1 POST
  • 1999 CHEVROLET S-10
  • 4 CYL
  • 910,000 MILES
Chevy s-10 runs fine. Sometime the low fuel, battery, abs lights stay on and the gas gauage doesnt work. Also a security light on. It comes and goes.
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Saturday, November 18th, 2017 AT 1:42 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
Check for bad body grounds. Check body control module (BCM).
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Saturday, November 18th, 2017 AT 1:42 PM (Merged)
Tiny
JEREMYBURTON
  • MEMBER
  • 1 POST
  • 1998 CHEVROLET S-10
Computer problem
1998 Chevy S-10 6 cyl Four Wheel Drive Automatic

i just had a new motor put in my truck after we got everything hooked up it would not fire there is a security light on the guage panel that will stay lit. It wont let any spark get to the plugs what can I do
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Saturday, November 18th, 2017 AT 1:42 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
If the security system has you locked out, the only thing you can do it have it checked by a dealer. They are the only ones that have the proper equipment to check it.
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Saturday, November 18th, 2017 AT 1:42 PM (Merged)
Tiny
MHOLLING
  • MEMBER
  • 1 POST
  • 2000 CHEVROLET S-10
  • 4 CYL
  • 2WD
  • MANUAL
Just had ignition put in it & security light blinks & miss on #4 cylinder. Can squirt gas in intake & it works fine but misses when you stop squirting gas.
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Saturday, November 18th, 2017 AT 1:42 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Use a gage and check fuel pressure. On cylinder #4, check fuel-- spark-- compression.

Any trouble codes for the security system?
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Saturday, November 18th, 2017 AT 1:42 PM (Merged)

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