Try to reset the security system, Do this it takes 30 minutes. Turn the ignition switch until the starter "just" clicks but don't let the engine start then let the key come back to run and wait 10 Minutes the security light will change after 10 Minutes turn the switch off then to bump the starter ect. Do this 3 times and after you turn it off the (Third) last time turn the key and allow to start. This should fix it. I hope this helps. Take care. If this doesn't work or you need more help use comment and it will show up in my email.
SOURCE: 2002 Monte Carlo wont start
sounds like your passlock sensor on the ignition barrel is faulty. you will have to go to the dealer to have it replaced because of the programming after replacement.
SOURCE: 2000 Alero Security light flashing and wont start
With the new lock cylinder in it, turn the key on. The security light should blink. Leave the key on for 10 minutes, the security light will quit blinking and go out after 10 min. This will reprogram your security system and the car should start. Also leave a battery charger on it while the key is on, If the battery goes dead during the 10 minute reprogram sequence, you will have to start over again.
SOURCE: Security light flashing and car won't start now
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.
SOURCE: Pontiac Car will not start security light is on. When security of
not saying this is the answer but ido see gm cars with these problems the dealer ads remote door locks to cars and they dont soder any of the wires the get paid one hour to install theses systems so they kinda throw them in thers alittle black box under the knee panel it has a yellow wire that is split to left fuse box one wire go to harness if that becomes loose car will not start and may trip security lite check for littel black it will be ty strapped to lower panel .... hope this helps THUNDERBOLTZ
SOURCE: dash board lights on grand voyager flashing when
the controls always click when you change the setting as it is electronic, don't panic, but you should ask your ex as he is well up in voyager' s and the back seat not folding down properly!!!!!
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