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No crank/no start

Tiny
RAM 09
  • MEMBER
  • 2000 CADILLAC SEVILLE
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
Car will not crank using ignition key.
fuses check good.
upper and lower crank sensors replaced.
battery checks good.
fuses under rear seat check good.
car will start if shorted out starter relay then shuts off immediately.
when key is turned display panel goes black.
tried both keys, no help.

Security light goes out after doors are closed, and ignition turned to the on position. I am looking now at the neutral safety switch and will check that.
All I can say now is help?

Car is an STS.
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Saturday, July 6th, 2019 AT 6:45 PM

18 Replies

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello again,

Okay, when you turn your ignition key to start, what happens? Does the engine crank but not start? Does it just click? Does it sound like a machine gun? Or does it do nothing at all?

Thanks,
Alex
2CarPros
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Monday, July 8th, 2019 AT 2:58 PM
Tiny
RAM 09
  • MEMBER
  • 9 POSTS
You hear a click dash lights go out and nothing happens. No starter noise and yes the security light is on now, and have tried the lock doors and windows and wait routine and nothing. And thank you thus far.
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Monday, July 8th, 2019 AT 3:31 PM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello again,

This could be a problem with your vehicle's Vehicle Theft Deterrent module (VTD). In the diagrams down below I have included a description of how your vehicle's VTD works and pinpoint tests to determine the problem with the VTD system. Please go through these guides and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Monday, July 8th, 2019 AT 6:12 PM
Tiny
RAM 09
  • MEMBER
  • 9 POSTS
The fuse box picture you have sent is not the same configuration as mine and there is no designation of THFT 1 on my legend under the fuse box cover, nor is there one on yours either. That being said I can feel clicking and hear clicking under hood fuse box as well as the fuse box under rear seat. Would it help if I sent VIN?
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Tuesday, July 9th, 2019 AT 11:03 AM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello again,

I also could not find a THFT 1 relay anywhere. I looked up a wiring diagram for your vehicle's theft deterrent system and no where on it does it have a relay on it. I have included it in the diagrams down below as well as a factory diagnostic troubleshooting guide for your vehicle's anti theft system from our other resource. Please go through this guide and get back to us with what you are able to find out.

Thanks,
Alex
2carPros
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Thursday, July 11th, 2019 AT 2:10 AM
Tiny
RAM 09
  • MEMBER
  • 9 POSTS
Is 40psi pressure on fuel pump check sufficient on 2000 sts.
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Sunday, March 15th, 2020 AT 4:40 PM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

Okay, so let's make sure that you are getting spark. Here is a link to a guide explaining how to check your vehicle for proper spark below:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Please go through this guide and get back to us with what you find out. We can go from there, if needed.

Thanks,
Alex
2CarPros
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-1
Sunday, March 15th, 2020 AT 8:56 PM
Tiny
RAM 09
  • MEMBER
  • 9 POSTS
While interesting, the question I asked was checking fuel pump with key on/no start, at the rail am getting 40 psi is this adequate for this car.
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Monday, March 16th, 2020 AT 10:41 AM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello again,

Okay, sorry about that. In the diagrams down below I have included the fuel pressure specs for your vehicle. It is just barely out of range, only a P.S.I. I would allow that to a guage variation, but I will let you decide. Please keep us informed.

Thanks,
Alex
2CarPros
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Monday, March 16th, 2020 AT 11:22 AM
Tiny
RAM 09
  • MEMBER
  • 9 POSTS
The reason I thought fuel pump is when I jump the starter relay the engine will start and immediately shut off, possibly gas starved. On normal start I turn key and I hear a click and all dash displays go out then back on after key return. Have replaced the chip on top of key and the cage the key assembly goes into. Everything on the car works, lights, radio, heater, seats, windows but no start.
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Monday, March 16th, 2020 AT 12:03 PM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello again,

That's why I was leaning towards the immobilizer or a problem with the ignition switch itself. What did you find out when you went through the immobilizer troubleshooting guide I sent earlier?

Thanks,
Alex
2CarPros
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Monday, March 16th, 2020 AT 8:54 PM
Tiny
RAM 09
  • MEMBER
  • 9 POSTS
Have tried the immobilizer technics a number of times and will try again. At present time have ignition tumbler on order, will be here wed morning.
Thanks so much for your help, one step closer.
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Tuesday, March 17th, 2020 AT 12:25 PM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello again,

Okay, you will either have to have this equipment to program the new keys to the anti theft system in your vehicle, or have the dealership do it for you. I have included the key programming procedure for you in the diagrams down below. Please keep us informed as to how everything is progressing.

Thanks,
Alex
2CarPros
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Tuesday, March 17th, 2020 AT 2:49 PM
Tiny
RAM 09
  • MEMBER
  • 9 POSTS
I have tried to communicate with vtd system, have 2 scanners and neither of them are tech 2 I guess, since I cannot justify 1000 up 3500 dollars gm scanners, it seems I am SOL. I did not replace key or tumbler as key turns freely and comes in and out no problem. New transponder installed on key switch and have gone thru relearn procedure for hours. Security light never truns off. Any ideas.
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Tuesday, March 24th, 2020 AT 1:37 PM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello again,

This sounds like you are going to have the new equipment installed programmed by either a locksmith or the dealership. Please keep us informed as to how everything goes.

Thanks,
Alex
2CarPros
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Wednesday, March 25th, 2020 AT 5:24 AM
Tiny
RAM 09
  • MEMBER
  • 9 POSTS
What kind of new equipment, for the vtd or what and why would I need a locksmith.I have no problem installing anything.I need a real answer.
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Wednesday, March 25th, 2020 AT 12:07 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,505 POSTS
If I can jump in here. I would do a CAN scan which is the future of automotive repair. you can get a CAN scanner from Amazon for about $50.00. here is a video to show you how. No subscription needed from the Amazon units.

https://youtu.be/InIlnsjOVFA

Let us know what comes up.
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Wednesday, March 25th, 2020 AT 12:12 PM
Tiny
RAM 09
  • MEMBER
  • 9 POSTS
Did not mean to be testy with Alex. I do appreciate the help but this car has been a total pain. I think I have a chance to use a tech 2 scanner for a while. Will reply once I have a chance to test it. Thanks, Larry
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Wednesday, March 25th, 2020 AT 5:12 PM

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