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Hi i have a 97 eldorado last friday came out of work and my car wouldnt start i had locked the doors with the electric door locks both my key fobs quit working i unlocked door with the key tryed to start car and nothing happened no message center no radio windows wouldnt roll down. So i bought a brand new battery didnt work tryed my other key that didnt work ended up buying new ignition switch then the car started drove the car a couple of places turned off and started right up got home turned off car locked it up went out to go to work and the exact same thing happened any ideas. Cant pull codes because the message center doesnt work only thing that works is the lights could the key not be turning the alarm off when i use it to unlock the door.

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Hi i have a 97 eldorado last friday came out of work and my car wouldnt start i had locked the doors with the electric door locks both my key fobs quit working i unlocked door with the key tryed to start car and nothing happened no message center no radio windows wouldnt roll down. So i bought a brand new battery didnt work tryed my other key that didnt work ended up buying new ignition switch then the car started drove the car a couple of places turned off and started right up got home turned off car locked it up went out to go to work and the exact same thing happened any ideas. Cant pull codes because the message center doesnt work only thing that works is the lights could the key not be turning the alarm off when i use it to unlock the door.

You need to check the positive cable take it apart and clean it, it could be badly corroded

Then you need to check/reset all of the relays in the relay center for green corrosion. Check the 12v power lines to the relay center and starter.

More clearly describe your problem, only headlights, no dash, no clicking, describe EXACTLY what is happening in detail since you cant pull codes.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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When i turn the key nothing happens just the security light will blink none of the warning lights come on the radio wont play the windows wont go up or down there is no clicking no sound at all just the light that tells you what gear the car is in comes on and when you try to start it it goes off. I can still pop the trunk and the fuel door both times this has happened is after locking the doors manually since my key fobs quit working.

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Like Mike said...

Take off the battery cables and CLEAN them.

Take the Positive (RED) cable apart at the battery end and clean all of the pieces.

I cleaned the connections this is what ive found the only way my car will start is if i turn the key to the on position and then unlock the door with the electric switch on the door then all my dash lights will come on and the car will start. Now if i drive it and go to the store or something and turn it off it will start right back up but if it sits for say an hour or more then i have to go through the same process to start it it has to be something with the theft system.

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If you cleaned the positive cable by taking the insulator off of it and cleaning it and making sure its not bottoming out before its tight, I would pull each circuit breaker and fuse in the relay center under the hood and check for corrosion. Look at the relay and its socket for corrosion and clean it out.

Also check the 12v wire that runs to the relay center from the battery to make sure its tight and not corroded.

Check all grounds

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I will do all of those things but i still dont understand why i would have to unlock the door for the car to start everything is getting good contact i just have to hit the unlock button for it to start.

Sometimes invoking a switch will cause a connection, ground or relay to draw more current and "cause" a connection to occur. We have seen corrosion, specifically green corrosion in the relay center create problems, that would be my first stop once you were sure about the battery cables

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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