Question about 2000 Chevrolet Impala

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Computer failure in 2000 impala ls

Lightening struck a tree next to my car and now it won't start. I changed the starter and the crank relay (I believe that is what its called) It is a 1 inch square fuse like block that goes in the fuse box under the hood. I had a mechanic inspect it and he checked and tested the car following the path it takes to crank the car. He said the computer ground is bad and the computer needs replacing. Could he be wrong? Can a used computer be installed or does it have to be a brand new one? He also said something about checking to see if the computer needed to be flashed or if it could just be installed. Can you advise me on this? I am a single mother on disability with very little money and no way to get a new car.

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  • Chevrolet Master
  • 808 Answers

#1 If the starter relay is bypassed will the car start and run? Has the car enter anti-theft mode? a used computer can be installed and all computers need reprogram new/rebuilt/used. If car can start and run without relay then the "controlled wire " can be grounded without replacing computer if NO other issues exist.
#2 scan tool check for codes in the IPC system this is where anti-theft information is stored.

Posted on Mar 24, 2014

  • Jessica Pease
    Jessica Pease Mar 24, 2014

    before this guy checked out the car the guy before that said it was crank relay thing and he did something under the hood and I was able to crank the car up with the key. Then this new guy tried doing some kind of bypass but the car started trying turn over when the key was in the on position before it even was turned to the start position. When you try to hook up a scanner to get the codes the scanner won't connect. How do I know if it went into the anti-theft mode. If I can put a used computer in it I can get this guy to do it but if the computer needs to be programed then I have to toe it to a garage and pay a lot more money.

  • Dan Jacobs
    Dan Jacobs Mar 25, 2014

    The problem with that it can not read codes is that this is something grounded on the class 2 data bus this means a control module is stopping communication this is why the car will not start. some cars have what is serial bus key this hooks up the computers to the same line with key removed they can not talk to each other and connecting scanner it should be able to check the power control module then by jumpering one more module at a time then you can find the bad module causing your problem. I AM telling right now a reprogram or reflash will not fix or get the scanner to talk to it. As for bypassing the start relay is easy it has 4 pins to it and they are numbered 85 86 87 30 85 and 86 control the power to the starter 85 being the ignition start sense power and 86 being the computer ground connection then once relay is closed 30 battery power goes to 87 the starter wire. by grounding the pcm wire this eliminates the anti- theft control

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SOURCE: 2003 impala -starter will not engage/no interior

youre problem posible cuase by ignition swith possible no supply from battery.maybe wire were disconnected

Posted on Jan 28, 2010

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SOURCE: I have a fuse blowing constantly on my van

you are on a search and destroy mission, i recommend you buy a manual with wiring diagram, at least it will tell you what is hooked on that circuit, thenits a matter of testing wiring, i suspect you have a short somewhere

Posted on May 24, 2010

Testimonial: "Well, thanks for the opinion, even though I read it after fixing my problem. It was indeed a short, as the cover for the wiring harness was missing, and apparently a wire had rubbed bare and was shorting against the valve cover. I couldn't actually see the bad spot, but by carefully moving it I isolated the spot and taped it up really good and put a new cover in place. Thanks for the quick reply though!"

  • 288 Answers

SOURCE: It is a 1997 Chevy

IF THE MOTOR WILL START WHEN YOU JUMP START, THE BATTERY IN THE BLAZER MUST BE LOW. USE A D.C. VOLTMETER, THE VOLTAGE AT THE BATTERY WITHOUT JUMPER CABLES, SHOULD NOT DROP BELOW 9 VOLTS WHEN THE STARTER IS TURNING. THERE IS A CRANK FUSE IN THE INTERIOR FUSEBOX. & A STARTER RELAY UNDER THE HOOD. BUT IF THE STARTER IS TURNING, THOSE ITEMS ARE WORKING. THEY ARE ONLY TO MAKE THE STARTER TURN. GOOD LUCK, DRVOLT.

Posted on Jan 27, 2011

  • 975 Answers

SOURCE: I have a 2000 Chevy

Does the security light in the dash blink?
Thinking it's a pass code fault(ignition switch)
There is no chip in the key,the computer looks for the proper rotation of the switch,had the same thing happen,
Should be able to start it if you crank the engine for a few seconds,release the starter and DON"T turn the key off,wait 10 minutes,crank it again,should start.
If not do the procedure again(had to do it 3 times on mine)
This is the relearn procedure that also has to be run after the switch is replaced(with a new key also)

Posted on May 09, 2011

  • 1 Answer

SOURCE: I own a 2000 Chevrolet Impala. Recently the

I have a 2003 Chevy Impala 3.4 and I recently got a "highbeam out" message in the message center. I checked the lights and both highbeams are on with the lowbeams. The are stuck on and will not go out. Any suggestions for me to fix this problem? Thank you.

Jim

Posted on Jul 02, 2011

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Circuit Description
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2
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Thinking it's a pass code fault(ignition switch)
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