PNP park neutral safety switch . Try moving gear selector to neutral . If it starts the switch is bad .
Voltage drop test starter circuit .
fusible relay ??? Now thats funny ! It's just a relay , not fusible relay ! A fusible link is a kind of fuse ,will melt with a short circuit. TEST ,TEST DON'T GUESS and if you can't test ,take it to a qualified repair shop.
How to voltage drop test starter motor circuit
Starter Voltage Drop
The computer has nothing to do with it .
http://www.bbbind.com/free_tsb.html Free wiring diagrams ! Suggest you view a wiring diagram to see what all is involved in the starter circuit . NO starter relay ! Enter vehicle info. under system click engine, then under subsystem click starting . You will when you turn the key to start it send's B+ voltage to the PNP switch ,from there it goes to the S terminal on the starter solenoid . Very simple . Get a volt meter an test B+ voltage .
SOURCE: 2001 pontiac sunfire wont start
I have had the exact same problem. There is an ignition lock that probably went off. There is a fuse box under the hood. The fuse that says ignition on it pull it out and put it back in. This should reset the ignition lock. Its a safety feature because the car thinks that someone was trying to tamper with it.
SOURCE: 2002 Pontiac Grand Prix Thermostat
as you face the engine the thermostat bell is on the right (drivers side) Follow the radiatoe hose. Remove the two bolts and raise the bell still attatched to the hose. the thermostat is there with the rubber seal. You can gently pry the thermostat out with a screwdriver or something similar. Put in new thermostat be sure it is the same as the old one, and then replace or change the seal (be sure it is the smae size and thickness as the old one as I got the wrong size from Napa) Then replace the bell, and tighten, but not over tighten. I hope this helps!
SOURCE: 2001 Pontiac Grand Prix Gt not shifting into OD
Basic Troubleshooting:
Although the Indicator says the vehicle is in "D" or "OD", is it really? If the linkage is mechanical, you may actually be in "3". Make sure the car is in neutral and pull the lever into the first forward position without looking at the indicator.
Does your vehicle have a switch to turn the OD off and you didn't know it? You may have inadvertently done this. In this case, though, usually there is a little dummy light on the dash that says "O/D off" or something like that.
Check the transmission fluid level on your vehicle and make sure it is to factory specification.
SOURCE: LOOKING FOR A FUSE BOX DIAGRAM FOR 2004 PONTIAC GRAND PRIX GT
It's under the hood, on the driver's side, under a square, black box with a lightning symbol on it. Loosen the flower-shaped screw that holds the lid of the box down, remove the lid, flip it upside down and when you look at the inside of the lid, you'll see a map of all your car's fuses. There's also a fuse diagram on the very end of the dash, but it's accessible only when you open the driver's side door. When you're driving, that end of the dash is blocked by the closed door.
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