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Car will not start

Tiny
SREVE
  • MEMBER
  • 1999 CADILLAC DEVILLE
  • 4.8L
  • V8
  • 2WD
  • AUTOMATIC
  • 136,000 MILES
Car won't start theft system problem light is on and fuel pump relay clicks constantly when key is on.
Saturday, February 27th, 2016 AT 2:13 PM

10 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,935 POSTS
The car will do that if the battery is low can you check it, here is a guide.

https://www.2carpros.com/articles/how-to-check-a-car-battery

please let us know what you find so it will help others
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Thursday, June 6th, 2019 AT 3:21 PM
Tiny
SREVE
  • MEMBER
  • 6 POSTS
I bought a new battery and still the same problem. Left key on to reset computer but still won't start. Will turn over but not start. Fuel pump relay still clicking constantly.
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Thursday, June 6th, 2019 AT 3:21 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,935 POSTS
It sounds like the fuel pump relay or the fuel pump has shorted, try the relay first here is a video on how to replace it.

https://www.youtube.com/watch?v=S6ka-fscAuw

Please get back to me

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Thursday, June 6th, 2019 AT 3:21 PM
Tiny
SREVE
  • MEMBER
  • 6 POSTS
I tested the relay and it's ok. I checked the voltage going to relay and it is sporadic. I think the car won't start has something to do with the theft system problem. The theft system problem light is still lit up on dash.
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Thursday, June 6th, 2019 AT 3:21 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,935 POSTS
Okay, open the open and close all doors, disconnect the battery for two minutes and reconnect, Then lock and unlock the drivers door and then try to start the car, please let me know what happens
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Thursday, June 6th, 2019 AT 3:21 PM
Tiny
SREVE
  • MEMBER
  • 6 POSTS
Ok, I'll try that tomorrow. Will let you know tomorrow night. Thanks for your input.
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Thursday, June 6th, 2019 AT 3:21 PM
Tiny
SREVE
  • MEMBER
  • 6 POSTS
I tried opening and closing doors, disconnected battery for 2 minutes, reconnect, lock and unlock drivers door, and still no change.
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Thursday, June 6th, 2019 AT 3:21 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,935 POSTS
Those cars have little wires coming out of the ignition switch which lead to the security system, its sounds like one of them is broken, you will need to remove the ignition tumbler to see if this is the problem.
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Thursday, June 6th, 2019 AT 3:21 PM
Tiny
SREVE
  • MEMBER
  • 6 POSTS
I did read that somewhere. Can I bypass that with some resistors?
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Thursday, June 6th, 2019 AT 3:21 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,935 POSTS
I don't think so the security system must be enabled and that's the only way I know of though I have heard of people bypassing it somehow, if you learn how please let me know
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Thursday, June 6th, 2019 AT 3:21 PM

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