how to start 2003 cadillac deville with dead battery
I don't get your question, your car will not start with a dead battery. You could try an charging the battery back up, buy a new one, or try jump starting it with a jumper pack. Make sure and have the charging system checked.
Remove the back seat lower cushion, it just pops up if you give it a quick snap upwards, hookup the jump box or battery, wait a minute or two start the engine and test power at the battery, it should be 14.2 to 14.8 volts if not you have a charging system problem, only let it run a minute or two as the alternator is not designed to charge a dead battery and will burn it out, have the battery recharged and then take it to have the entire system tested.
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