Pontiac Problems? Ask a Mechanic for Answers ASAP
Does the ignition key have a security chip in it?
The problem you are having is in the security system. It will disable the starter, also disables fuel injector control (will allow engine to start for a few seconds if starter is jumped). The most common issue is breakage of the wires coming off the ignition lock cylinder. This prevents key chip signal from reaching the antitheft module.
There are two ways to fix this issue. 1) Replace the ignition lock cylinder 2) Bypass lock cylinder wiring. You can do this by placing a resistor across the wiring coming out of the column. Resistor must match resistance of key chip.
Okay, if you are getting good signal at wiring harness then the lock cylinder is okay. Problem will then be in the Passkey module. Make sure to check fuses before replacing the module. Module is located behind passenger side of the dash. See illustration.
If you install a new module then the module learns the key chip resistance on first startup. If you install a used module then you will need to change the key to match the resistance value that was already programmed into that module. Lock cylinder would not have to be changed, you can get a new key with the proper resistor chip and then have it cut to match the cut of your existing key so it will turn the lock cylinder.
Check fuses shown in diagram attached. Test for voltage at the Red and Pink wires going to the module. Key must be on when testing for voltage. The part number for the module is 88964942. Make sure the replacement part has the same number.
When turning the key to START position, test voltage on the thick yellow wire. Do you have voltage there? If not, check voltage on each of the thick Red wires going into the ignition switch. Let me know what you find there.
At the module, ground the yellow/black wire and try starting the engine with the key. Let me know what this does.
Check the fuses shown in the diagram below for power with the key ON and check the fuses themselves. Let me know what you find there.
If those two fuses have no voltage then the others likely do not. Go to the maxi fuse panel in the underhood area at the firewall. See picture below. Check all of the fuses in these two panels. Note that there is likely a plastic panel covering these fuse panels that will need to be removed.
You should have a double positive cable at the battery. Try replacing the lead spacer between the two cable ends, then check power at fuses and attempt starting again.
The y/b is just the ground signal to the starter enable relay. The PCM gets a separate signal from the theft deterrent module. This is a pulse width modulated signal.
Do you still have no voltage on some of the maxifuses at firewall?
Yes, if maxifuses are all good and row B will not power up with the ignition on then this indicates a failure of the ignition switch.