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Re: security light flashes car wont start
You need to go to GM and find out what defective part is causing this, the most common is the sensor in the ignition lock cylinder fails, then when you try to start it doesn't send a usable signal from the key chip to the electronic module that controls the security system and it locks you out.
a 6ya expert can help you resolve that issue over the phone in a minute or two.
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If you find yourself stranded, your engine won't start, and the security light is flashing, ... The most common repair is to replace the ignition lock cylinder or Passlock ... The warning light on the VATS system is similar except it does not have the ...
Hello: Try this, Turn key on, try to start, let k/switch come back to run, let set for 10min(security light out) turn key off 10sec, turnkey back on let set 10min, turn key off 10 sec, turn key on let set 10min. turn key off 10sec. turn key on start car if it doesn't start and the security light is flashing you have a passlock problem and it will require a new lock cylinder assembly and the above learn procedure.
You need to reset the Passlock security system to your Tahoe.
1. Attempt to start the car, let it stall, but DO NOT turn the key off! Leave it in RUN.
2. Wait 10 minutes or until the Theft System light glows steady instead of blinking.
3. Do not turn the key off, but start it immediately.
4. This should reset your Passlock system.
Good luck and thank you for using Fixya.
If that does not work then your may have to do the 30 min relearn. You do basically the 10 min thing with the security light trick instructions above. Here goes this only works if your secuity light is on.
key in ignition don't start the car but you want to turn the key all the
way on and release it back to the on position wait 10 mins or till the
security light stops flashing repeat this the exact same way two more
times( dont take key out) ending in about 30 mins total time. this
should reset the code to the computer and you should have no more
problems with it.
Ok then, from your description and the
make/model/year of the car you have there,
it appears you've reset the VATS.
The car's security immobilizer
reader at the key switch
does not recognize the coded
chip in the ignition key any longer.
You can try to put the key
in the ignition, turn to the on position &
wait at least 10 min like that.
(Do not turn off the key switch before
10 minutes as elapsed!)
Once done, the key is re-programmed and
should allow the fuel injectors to work again.
The car would start now if corrected.
In some cases, the VATS (GM'S VEHICLE ANTI THEFT SYSTEM)
will re learn the code this way, and will then
allow the restart, however if this does not work,
then you can simply tow it to any GM vehicle dealer
to have the service department re code it.
There is a permanent solution though.
Adding the PLJX Self learning Bypass module (59.95)
will bypass the PASSLOCK system in your vehicle
for good. See this at www.PASSLOCK2.com
Good luck I hope method 1 does the trick!
Here is the 30 min relearn:
Ignition keys relearn takes about 30 min to do. 30-Minute Learn
Procedure 1. Turn ON the ignition, with the engine OFF. 2. Attempt to
start the engine, then release the key to ON; the vehicle will not
start. 3. Observe the SECURITY tell tale light. After approximately 10
minutes, the light will turn OFF. 4. Turn OFF the ignition switch, and
wait 5 seconds. 5. Repeat steps 1 through 4 - two more times - for a
total of 3 cycles of 10 minutes. 3x10 = 30 minutes. The vehicle is now
ready to relearn the Passlock Sensor Data Code and/or
passwords on the next ignition switch turn from OFF to CRANK Important:
Turn the Ignition Switch OFF. The vehicle learns the Passlock
Sensor Data Code and/or password on the next ignition switch transition
from OFF to CRANK. You must turn the ignition OFF before attempting to
start the vehicle. 6. Start the engine. The vehicle has now learned the
Passlock Sensor Data Code and/or password. 7. With a scan tool, clear any DTCs if needed. History DTCs
will self clear after 100 ignition cycles. Without a scan tool you may
have momentary starter interruptions while history clears itself.
I had a problem with a 97 Achieva recently.Someone else replaced the PCM/ignition switch and passlock sensor.I replaced the ICP.Engine would turn over but wouldn't start and the security lamp was dim and flashing and then it would go solid.I tried the wait 10 minutes thing but,the light would never go off!
I put the original passlock sensor back onto the lock cylinder.
But this is what fixed the problem.I cleaned the contacts on the black wires and green on the ignition switch with tv tuner cleaner!
After I cleaned those contacts the security light was flashing brightly.So I turned the key to run and left it there.After a few minutes it stayed on solid.I waited about 10 minutes but the light never went out.So I turned off the switch and then tried starting.It started right up and the security lamp flashed and then went off.Has started every time since.Note:I also scraped the pins that I cleaned with the cleaner with a knife.
After you replace the ignition switch turn the key to start the car and release leave the key were it stops after trying to start wait 10 minutes until security light goes out turn key to full off position then repeat the above procedure two more times for a total of three on the 3rd attempt to start car wait for light to go out then turn key to full off positoion wait 10 seconds then try to start car body control module should learn new pass code and the car should start.
Big john, J@J Automotive
does it start at all, or does it run for about 1 second and shut off? if the latter, then it's the passlock system, and he could have a defective key or security module. the keys have a predetermined resistance value which activates the passlock system to prevent hotwiring. If it is the passlock system, then sometimes you have to wait 15-20 mins for it to reset before starting the engine.
The fab key activates the security system in the car, the ignition pass lock may need to be reset to your ignition key's. It Takes about 30 min to do. Try resetting the pass lock to read your ignition keys.
30-Minute Learn Procedure
1. Turn ON the ignition, with the engine OFF.
2. Attempt to start the engine, then release the key to ON; the vehicle will not start.
3. Observe the SECURITY tell tale light. After approximately 10 minutes, the light will turn OFF.
4. Turn OFF the ignition switch, and wait 5 seconds.
5. Repeat steps 1 through 4 - two more times - for a total of 3 cycles of 10 minutes. 3x10 = 30 minutes.
The vehicle is now ready to relearn the Passlock Sensor Data Code and/or passwords on the next ignition switch turn from OFF to CRANK.
Turn the Ignition Switch OFF.
The vehicle learns the Passlock Sensor Data Code and/or password on
the next ignition switch transition from OFF to CRANK. You must turn the ignition
OFF before attempting to start the vehicle.
6. Start the engine. The vehicle has now learned the Passlock Sensor Data Code
7. With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100
Without a scan tool you may have momentary starter interruptions while history clears itself.
Good luck and hope this helps. The ignition keys has a resistor value for the ignition to read and after a few years the resistance may change and the Pass Lock has a had time reading it's value so you have to reset the pass lock to read the keys again.