How to replace a ignition lock cylinder for a 1999 cadillac deville try to start car and it says remove key and wait 3 minutes and try again...i do and it still won't start...gm says the ignition lock cylinder needs replacing..it's not reading the chip on the key..

According to RepairPal: "the car wont start due to anti-theft system, it will say wait three minutes then start, but repeat this process 4-5 times - Visitor"

They say there are 75 reports of: "Problems with the anti-theft systems using the raised-chip key can prevent the car from starting. The wires in the steering column to the ignition lock cylinder tend to break. The the key and ignition lock cylinder must be replaced to correct this condition."

the resistenance reading from the resistor in the key is not. getting to the theft system. to repair you need to replace the ignition lock cylinder and a new key.

The problem is either the key and or the ignition switch. The key has aresistor and the engine module reads this value when you start the car. If it is not the correct value the car will not start. MOST LIKELY THE WIRE(S) yhat come off the ignition lock cylinder are broke. This is a common failure. To correct a new ignition lock cylinder and key will be required to get the car to run

One of two wires on your ignition lock cylinders is broken. Replace the ingniton lock cylinder and that will solve the problem. Von("LOCKED OUT*LOST KEYS" DC)Automotive Locksmith

I've got an even cheaper and easier solution, instead of buying a new cylinder, find that plug and snip the orange wires going to the old cylinder.Then remove the resistor chip from the key and solder each of the the wires to each side. this will fool the car into thinking the correct resistor chip is in place, allowing you to use the original key or any copies with or without resistor chips. i just did this to my caddy and it roared to life! :)

Replace ing. lock cylinder and key.

Bad contacts in the ignition lock cylinder.

Move the key in and out of the lock cylinder over and over to clean the contacts. Then wait the three minutes. Don't try to start it before the three min is up or the three min. timer will start over.

Get a new cylinder put old key with chip in it. Find orange wire from old lock cylinder at bottom of steering column just under dash. Disconnect and connect new wire from new lock cyl. Get a copy of the old key for the old lock cylinder {no chip needed} to start car. Hide or mount new lock cylinder hidden under dash. Remove chip key to activate theft system.

disconnect your battery wait 30 seconds then reconnect and it wll start for sure. if not get a new or clean your old key and make sure it is dry then try again. I have dealt with this a hundred times an think it has to do with worn chips on the keys/bad sensor in the ignition.