2002 Olds Alero. Dash security light. I replaced ignition module. The car was working fine and the
radio was left on while I was in the car.

When I went to start it, it wouldn't start. After letting it sit for awhile it finally started. We had it
tested for codes and non came up. We replaced the ignition module and it started right up. Now it
won't start again. I have read about this problem from other people on here and it seems as
though it may be the ignition cylinder is bad.

I saw where you told a person you would send them some information on how to replace this. Is
that something you could also send to me? I would really appreciate it and an email would be the
best way so I could have it quickly.

Thanks for the tip/donation.
It does sound like the ignition lock cylinder, which is also called the Passlock Sensor. Here is a pic
of the release tab on the ignition switch. Remove the radio to access this.
Oldsmobile Alero Radio Locked

2001 Oldsmobile Alero. My battery cable came off. When it was replaced, the radio is now locked.
When it was put back on, the radio is now locked and Says LOC.

On this vehicle and system, there are no radio codes to enter. The radio should not lock up after a
battery disconnect. The system uses the VIN of the car for radio theft security. The loose
connection at the battery may have caused a malfunction in the radio and needs to be diagnosed
with a scanner. The radio Theft on this system must be re-learned through the dealer scanner if
Radio Unlock Codes.

2002 Oldsmobile Alero.
Removed old blown engine new fuel assembly many new items to be exact. Has after market radio.I
am wondering if and I hope I don't sound completely ignorant. But do I need to bring the car to a
dealership with a new stock stereo and have them program it all? It at this time gas an after market
deck. Could doing this replacement work if its gets programed?

Yes, is you install a new factory radio, you will need to get it programmed for your Oldsmobile. Also
the theft will need to be learned or disabled. If you do not do these things, the radio will not work.

Be sure to get the correct radio for your car. Do not just get a GM factory radio. Many people do
that and think it will work because it is a factory unit. But that is not the case. It MUST be for your
model and year Alero or you will have nothing but trouble trying to get it to program and work
properly. Expect to pay 1 hour labor charge to have that service done.
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Oldsmobile Alero Ignition Cylinder Removal
Oldsmobile Alero ignition switch and passlock key cylinder replacement.