Car will not start or even turn over

Tiny
SENSEIANDE
  • 1985 CADILLAC DEVILLE
  • 68,500 MILES

A while ago I went to start this car. I noticed that the headlights were becoming dimmer so I shut it down to re-start it. It would not turn over at all. I checked all the obvious; i.E. Battery/alternator and various electrical connections. The inside of the car powers many but not all of the dash lit components and I hear what sounds like a component running on the right side of the dash. I tried the diagnostic screen but there is no power to it. Also the fuel data control center shows an empty tank all the time except for immediately after filling up and all the other feature are obvious wrong (the data center has been tested and is fine). Do these problems sound like a body control or engine control module? I have not bench tested the starter yet because these additional issues lead me to believe that it is a module? What is the likely suspect and which should I check 1st?

Thank you for any and all help - this is getting frustrating and I do not wish to pull the starter if nothing is wrong with it.

Thanks again

Andrew

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Friday, July 13th, 2012 AT 6:53 PM

8 Replies

Tiny
ASEMASTER6371
  • EXPERT
  • 25,554 POSTS

Start with a bettery check. That would be the first place I would go. Without sufficient power, nothing will work.

Roy

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Friday, July 13th, 2012 AT 6:58 PM
Tiny
SENSEIANDE
  • MEMBER

The battery is brand new and has been checked for charge - it's fine.
The alternator has been bench tested and is in perfect working order.
I have not pulled the starter yet due to the weird electrical issues inside the vehicle. And is why I am now thinking it may be either the BCM or ECM module -?

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Friday, July 13th, 2012 AT 9:57 PM
Tiny
ASEMASTER6371
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Dont go there yet. I would look at conections at the battery, starter, and the grounds at the block and the bell housing. It sounds like a power supply issue.

Roy

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Saturday, July 14th, 2012 AT 12:22 AM
Tiny
DJCL
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There is a ground behind the ac compressor that has known problems.

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Saturday, July 14th, 2012 AT 1:07 AM
Tiny
CADIEMAN
  • MEMBER

Ck. The voltage at the starter. Hold the key in start position then tap the starter with a hammer will it start then?

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Saturday, July 14th, 2012 AT 1:35 AM
Tiny
CADIEMAN
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Werid wiring?

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Saturday, July 14th, 2012 AT 1:38 AM
Tiny
CADIEMAN
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You will have to replace the fuel tank unit for the flashing e.U need to us a volt meter to check where your losing power. Push off and warmer buttons on the a/c panel if it lights come on. Then write the codes down. If the a/c and fuel data centers are out it may be a bad bcm.

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Saturday, July 14th, 2012 AT 5:34 PM
Tiny
CADIEMAN
  • MEMBER

Forgot youll need to disconnect the fuel data display and see if the a/c panel lights if no plug it back in the fuel center and disconnect the a/c panel to see if the fuel center lights. If neither lights up replace the bcm.

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Saturday, July 14th, 2012 AT 10:01 PM

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