When you turn the ignition switch to start ,it sends 12 volt input to the PCM - engine computer . The PCM will then energize the start relay in the under hood fuse / relay distribution box.
Here is factory service info.
Circuit Description
Moving the ignition switch to the START position sends a 12 V signal to the PCM Ignition Crank Sense. The PCM verifies that the transmission is in the PARK or NEUTRAL position. The PCM then grounds the control circuit of the START relay. When the START relay is energized it allows battery positive voltage to the starter solenoid S terminal.
Try moving the gear selector to the neutral postion when it fails to start . To eliminate or confirm the park neutral safety switch as the problem . Are any lights lit on the insturment cluster ? Check engine , security ?
SOURCE: Ignition will not recognize the key chip and it will not start.
call a locksmith they have a reader and can tell if your key is the problem... it will tell them which keycode is for your vehicle and they can check and see if the key matches also i have a 95 ssei and the pcm was the problem with mine
SOURCE: key wont comeout of the ignition switch, do i need a new switch?
First, spray a bunch of WD-40 into the key cylinder -- use the red tube which comes with the can to do this -- put something on the floor to catch the oil dripping down.
This has a good chance of solving your problem. After a couple of days, buy some graphite lubricant (Pep Boys) to blow into the key cylinder. Repeat the graphite every month or so for 6 months.
SOURCE: 96 pontiac sunfire wont start.....
Starter solenoid , or wire that leads to it.
Also , if standard transmission , may be the switch on clutch pedal is intermitant.
Engine won't turn over unless it thinks you have your foot on the clutch.
SOURCE: 2002 Pontiac Grand prix wont start; unable to remove key
On many cars, if the battery is dead, it locks the key in the ignition. Put a battery charger on the car or replace the battery and give it a shot.
Good luck.
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