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99 cadillac deville
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16 Posts
Discussion Starter #1
i have a 99 deville and there is no set time or occurrence that it will go into storage mode but sometimes i go out to go to the store and the remote wont unlock the doors cuz all power is cut off. so i have to start it and when i do that the factory alarm goes off until it recognizes the remote and it unlocks the doors. mind you that really pisses off the neighbors at 1 or 2 in the morning. i tried disabling it from the dic and it still does it. im really lost. i just got my service manuals i ordered and im starting to go through them to see if i can trace the wiring part of it, but would like an easier fix if anyone could help. thank you :confused:
 

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99 deville
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12 Posts
My 99 was doing the samething would happen spuraticly. A couple of months later my alternator went out replaced it and have not had the problem since. Coincedence Maybe? Check your voltage with engine off and while running.
 

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99 cadillac deville
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16 Posts
Discussion Starter #4
it came up with two generic codes
P0503
vehicle speed sensor
A
Intermittent/erratic/H
same two exact codes. i have already changed out alternator thats why this has got me stumped. i appreciate all the feedback and the help.
 

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99STS,2004 Jeep Liberty Renegade,98 Deville RIP
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1,054 Posts
Do you have an aftermarket Stereo in the car? One of the reasons the car will go into storage mode is the draw on the battery, the PZM is what controls all of this, start looking at that.
 

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99 cadillac deville
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16 Posts
Discussion Starter #6
yes it does have an aftermarket stereo but this has its own circuit from the battery. but i was having the problem before i put the radio in. im at my wits end on this one.
 
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