No electrical?

start with a fuel pressure check. it may be seizing and if that the case, the fuel pump will have to be replaced.

This guide can help fix it

https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

Roy

When I press the brake and Start Button, the dash goes black, but radio screen on and unresponsive, and will not crank/start at all(no clicking, no nothing). After 10-15 seconds, dash lights come back up as if car is running, but engine has not started. Battery is 6 months old. All interior lights and gauges appear to be working properly but radio display is stuck although radio working. Tried to jump the car but didn't work. Tried holding disconnected battery cables together for a minute, didn't work. Tried wiggling shift knob and starting in neutral, nothing changed. When I try to start I hear a click seemingly under the shift knob. I have had starting issues in the past but jumping always worked as did replacing the battery in June. Any ideas what this could be?

Hello,

I have seen this problem before the positive battery cable needs to be replaced here is diagrams and instructions below. Check out the diagrams (Below). Please let us know what happens.

They all look good. Battery read high 12's.

Based on your description, you have a bad ground at some point. When you first try to start it, there is a heavy draw. That will cause a bad or corroded connection to lose contact. Check the ground to the engine block to make sure it is tight and clean. Have you replaced the cable?

OK. Thanks for the help, I got the new cable today and installed the problem is fixed. I love this site.

Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help.

Joe

Hello I have the same problem as Bruce with the dash going black at startup then coming back on 15 seconds later I've read that you recommended to him to replace the positive battery cable my question is would I still need to replace this cable if I jump the starter relay and verify the starter works that way

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A friend that owns a shop working on diesel trucks. Air conditioner was working on my air conditioner and jumped a wire across something in the fuse panel and then it popped and everything shut down. I might point out that the car was running when it happened and then shut down. After that not a light or anything has power. what do you think i should start by looking at besides another friend and mechanic? I purchased a used computer today from the wrecking yard today out of a 2002 STS. What do I have to do to put it in my car or can I even install it in my car? Thanks guys for all your help.

There are about four dozen computer modules on your car, but none of them are going to cause a total electrical failure. Do not jump on the unlikely and expensive stuff before you look at the simple things. Start with the fuses in the under-hood fuse box. Since I do not know what was shorted or what blew, start with a few voltage measurements. Check for 12 volts on the large bolted-on wire on the back of the generator. Also check on both sides of the large fuse that is usually bolted into the fuse box.

Visually inspect the large fuses to see if one is blown.

Thank you I will start there and let you know what I find. Thank you

You are welcome please get back to us when you know something so it will help others.

Best, Ken

Any way possible to get a wiring diagram of the ignition modules and the starter relay?

The best way is to get a copy of the manufacturer's service manual. Don't waste your time looking for a Haynes or Chiltons for this because they don''t have electrical diagrams. You can also buy a subscription online for jut your car from the same companies the independent repair shops use. The common ones are Mitchell-On-Demand and AllData.

Also consider visiting the dealer. At the one I worked for, the service writers had the owners' blessings to photocopy a few pages for regular customers If they had the time. We did that for other dealerships in our area too.

engine shuts down whike driving lose off dashbord loghts and gauges, engine will restart right away , this happens a few times a day.

Only thing that comes to mind is an ignition switch, but that is just a guess. It would need to be diagnosed.

Hello UP29BALNE1,

I found these wiring diagrams for you. please let me know if you need anything else.

Best, Ken

I drove my car last night, but when I came out this morning and turned the key, nothing. I tried to jump it using my 600 amp starter box and still nothing. I've left the lights on before and ran the battery down, but I've never had it show nothing inside the car when I turned the ignition switch. No dash light, radio, horn, or anything else works. When I turn the key, I can hear one of the relays inside of the fuse box under the hood make a faint clicking noise, unlike the noise usually heard from the starter relay when the battery is too low.

I'm thinking that it's one of the fuses or relays, but I can't figure out which one, of the many that this car has. Any help will be greatly appreciated.

start at the battery to make sure it has juice, then Check all connections, especially the ground connections. Using a tester to see if you are getting power that feed into the main fuse box. With you getting nothing I am thinking that there is a wire loose or broken, preventing from the system getting power. Most times the connections on the battery terminals will cause the problem. With the faint clicking sound, i think it could be not getting a good ground

I came back yesterday and tried to report that I'd already figured out what the problem was but couldn't figure out where or who to let know. The battery had "crashed" and a new battery fixed the problem. I appreciate your answer, but the problem is already fixed. I'd like to know what I need to do to get credited for the donation this time.

I have a 1997 cadillac STS, its cut off when i stop at the red light, that when the Engine light come on about 10 min after its come on, can you please tell what to do with that problem, i am going to stop going to this shop he is taking my money for nothing

try to change the throttling positing sensor it not expensive it about $30 bucks and easy to change

[quote:6785b2c896="msavage4a"][quote:6785b2c896="msavage4a"]Engine problem
1997 Cadillac SRX - STS V8 Front Wheel Drive Automatic 132000 miles
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I have a 1997 cadillac STS, its cut off when i stop at the red light, that when the Engine light come on about 10 min after its come on, can you please tell what to do with that problem, i am going to stop going to this shop he is taking my money for nothing[/quote:6785b2c896][/quote:6785b2c896]

have the codes scaned, autozone will do this for free, I would say the crank sensors are at fault, its common, have them both replaced, do not replace the tps

How do i tell If the electrical wiring is no good or coroded??

No good is general, and would need some testing to confirm. Corrosion can be a visual thing, but not always. What electrical wiring are you speaking of?

iM THINKING THE ELECTRIC THAT MEETS WITH MY STARTER MAYBE?

What are the symptoms leading you to suspect it, does it not crank? If it is a no crank, the signal can be checked at the connector at the front of the rear bank of cylinders. With a test light, check for a power signal on the harness side of the purple wire. If there is a start signal there with the key in start, then it could be a faulty starter. If there is no signal, it could be a fault with the theft system, or park/neutral switch, or circuit.

Hello All,

I have a 2006 Cadillac STS 3.6L RWD. Has just shy of 69,000 miles on it. I've been having similar issues as previously posted in this thread. While driving, the chime goes off, the gauges drop and shoot back up, the radio stays on but the music cuts out, a 'Service AC' MIL goes off, and has stalled twice now. It has a new battery and a new alternator. That did not fix the issue. If I don't start the car for a day or two, the battery is drained.

I read that replacing the positive battery cable might be the issue? Thoughts?

Thanks,
Sergio

I have a 2006 STS. Car shut off yesterday while driving, won't restart. New battery. All lights work. When I push start button It clicks once. Battery voltage goes way down to 8,9 but shoots back up. Is something draining the battery? Alternator? Starter?

Good morning,

First, I would clean the battery cables really good of all corrosion inside and outside to eliminate a bad connection.

https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

If that is ok, then you need to have the battery charged to 12.6 volts and have it load tested.

https://www.2carpros.com/articles/car-battery-load-test

https://www.2carpros.com/articles/how-to-charge-your-car-battery

Then the charging system needs to be tested to be sure the alternator is working correctly.

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

Roy

Tested battery it's good. Battery was charged to 13.5 Volts. Tried to start it and 1 click no start. I will try cleaning the cables. But they looked good.

Clean them really good.

Keep me updated.

Roy

Okay. OBDii codes. P1137. P0036.P0102. P0455. P2096. P0420. P0174. P0113. MAF. 02 Sensor. Evac leak. Fuel trim system too lean. Low voltage during power Enrichment. None of these will make my car not start. It is a 4.6 V8. Maybe the low voltage one.

If you cleaned the battery cables, there should be no codes at all as removing a cable clears the codes.

Roy

But would any of the codes make my car not start? So, should I hold off on getting a starter? I've never owned a Cadillac before. I'll retry doing the battery cables. And when I pushed the start button it drained the battery lights went dim then back.

Clean the cables real well.

I don't think you need a starter at all. This sounds like you have a bad battery.

Roy

This is all I get. Scrubbed cables. My car tries to engage but won't go all the way.

Did you remove them and clean them?

If you did, replace the battery.

Roy

Brand new battery had it tested twice.