What is the problem with a 2003 Chevy Impala when I go to start it, turn the key the dash lights and radio go blank; turn it off and try again in a few minutes then it starts???

Why do think the key security is bad? If you still have a factory key, this is not the problem...if no factory key, you can take your VIN number or original key to GM dealer to get new key that they will program for you...Check for dirty battery connections:)

Your igntion switch is worn out.. replace it.

This is a problem with chevy vehicles that have the system theft light. after a couple of years of using the key, the lock tumblers inside the ignition switch tend to wear out and so causing the system to think it's being stolen. Now you have to put the key in and turn the ignition to the on position, without cranking the car and leave it for 10 minutes until the theft light goes out. Very annoying especially if you're in a hurry. The dealer cost to repair the ignition switch goes for about $600-$800. that includes re-teaching the key.

POSSIBLE CAUSE BATTERY CABLES COULD BE LOOSE OR CORRODED OR BAD GROUND CABLE.YOUR STARTER SOLENOID OR STARTER IS FAULTY.YOUR CAR COULD BE IN THEFT DETERENT MODE.ALSO CHECK IGNITION FUSE TO MAKE SURE THE IGNITION SWITCH IS GETTING POWER.BECAUSE A BAD IGNITION SWITCH WILL CAUSE NO START PROBLEMS.

1 turn the key on
2 press the button on the radio that changes the station for 20 seconds or so
3 the settings display will pop up on the radio display area
reset the tire monitor there

normal condition lamp sensor on top of instrument panel turns lamps on and off with lighting conditions when headlamps are on dash lights are on whwn drl,s are on dash lamps are off

Try under the dash, attached to colum is a switch that the rod goes into from your ignition key switch, that may need to be adjusted tword your steering wheel just a touch, they go out of alignmnet from time to time

Are you reffering to the alarm or the pass lock system that put the theft light on.....If its the alarm the put the key in the door and unlock it. If its the pass lock system put the key in the ignition and turn it on and try to start the vehicle. After it shuts itself off leave the key on for ten min until the theft light stops flashing the turn key off and try to start it again. This may take a few times....

yr gonna have to get the passlock key and punch it into the radio so u can solve ur problem most chevy dealships can assist you with that.

Not sure what you mean by a head unit, but best thing to do is to start taking it apart again 'till the key is again free...then look to see what was binding.