1999 Pontiac Sunfire won't even turn over, but the

It appears to be that the radio clock display has malfunctioned, and is due for a replacement radio, which could be an aftermarket or oem radio, maybe found at a junk yard.

Tools required for oem replacement radio, torx keys set.

Before working on the radio or other electronics, disconnect the battery cables with 8mm wrench.

Replacing the oem radio is much easier, if you obtain oem radio, compared to aftermarket radio, due to being direct fit.

The radio is same for 1995 to 1999 Pontiac Sunfire and the Chevy Cavalier, regardless of sub models, such as SE,GT, VL,VLX,Z24. etc.

Parts needed for the the aftermarket radio install :Stereo assembly, stereo wiring harness adapter, radio antenna adapter, and dash install kit.wiring diagram for the wire colors / functions, along with tools, such as torx key set, screwdrivers,wire crimper, wire stripper, double ended wiring connectors, hair dryer.

The oem stereo removal video is for the 2000 to 2005 Sunfire / Cavalier, but are the same or very similar procedures.

Link to oem stereo removal procedures.
Pontiac Sunfire Radio Repair and Removal 2000 2005


Link to aftermarket stereo install / connect procedures. ( Sunfire Video )
HOW TO INSTALL AFTERMARKET STEREO PONTIAC SUNFIRE

Link to aftermarket stereo install / connect procedures. ( General Video )
How To Install Car Stereo Single Double DIN Car Audio 101


Have a nice day.

These vehicles are prone to failures in the antitheft system. This will actually lock out the starter and/or injectors. Read thru this link, might be your problem.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

The most likely answer is that your vehicle's door pin switches aren't working. When you open the driver's door, does your dome light turn on? Your radio works with the vehicle's data bus to stay on until the door is opened; if the system can't tell that the door has been opened, then it won't turn off. The door pin switch should be mounted at the front of the door opening.

you car likely thinks its stuck in reverse, which it may be... even if you can roll it. you'll need to find a way to either get it into park or neutral, normally this can be done by the actual linkages under the shift console or from underneath the car.

Try starting it with the shifter in neutral. You might have a bad
Neutral safety switch.

check out radio-code.com

Your car is equipped with a system called PASSKEY standard on all GM cars and light trucks, try the following procedure to reset the system, the battery being dead will trigger the system.

PASSKEY LOCKOUT RESET GM CARS 1999 UP
1) Put the key in the ignition and turn to the "ON" position. Leave it that way for 10 minutes. After 10 minutes turn the key and take it out. Repeat this process (2) more times (3 times, 30 minutes total) This should reset the passlock system to recognize your key.

how do i get the lock code for my car stereo 1999 pontiac sunfire gt

Does it crank at all? If it doesn't even crank it could be your starter.

I love this car. Especially in Red.