Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hello there, lets get you fixed up. First off it sounds to me like you have a problem with your connection to the battery. Can you remove both cables clean them extra good, clean the post take the positive and negative and rub them together, this will drain all modules and force a reboot. And then rehook and try it. IF it dont work, do you have a voltmeter?
Okay so the car will not spin over lets start there with your voltmeter verify 12 volts on big cable, then with an assistant attempting to crank the car monitor the voltage on the purple wire, you should get 12 with key in start position
Yes you want to have the meter lead touching the purple wire or the solenoid pole which it attaches. And the fact that you have no power there is our problem.
I am thinking here about our next move, I am worried now it is the theft deterrent
If you got in the car turn the key and try to crank, nothing happens, motor does not spin over, if you release the key to run, what lights are on, what about security or theft light
Perhaps we have lost power to fuse box inside
take your voltmeter and check both sides of every fuse under the hood
Matter of fact start with battery and follow the trail of voltage to we find where we lose it. How about a ground wire, is it possible you left one off,
if you took the relay and put your ohmeter across terminals 30 and 87 it should be open, 85 and 86 should show some continuity around 10 ohms I believe, put your ohmeter back on 30 and 87 now take a set of jumper wires and put negative on one terminal and battery voltage on the other of 85 and 86 it doesnt matter which one is which when you put the ground and hot on 85 and 86 you should hear a click and your ohmmeter should read about .3 of an ohm. a relay is merely a remote controlled switch.
The fact that you have no communication at the obd connector and your display is blank i think we either have a power supply issue. Or I hate to tell you this, I have been doing some research on this, and there is a high reported failure of bcm on this car so much so that chevrolet has issued bulletins concerning so, and when I researched the repairs alot were when batteries were changed
And you say u have no communication from a scanner, and did you ck the fuses with a voltmeter
You checked them by checking for voltage on both sides of fuse right?
I have got to go work for a little bit,, If you checked all the fuses that way, it is not going to be something simple we have already eliminated that. But ifyou want I will walk you through how to diagnose, does your scannner work on the body control module and abs module and pcm
Is it okay I hit you back in couple hours
Okay please go back and check voltage on each side of every fuse I want to know if we are losing power
Amen, if I have helped you please give me a positive rating