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bad ignitiion switch?
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93formula
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PostPosted: Sun Apr 29, 2007 4:08 pm    Post subject:  bad ignitiion switch? Reply with quote

it only happens once every few weeks, and only after the car has sat for over 8 hours or so. when i go to start the car it wont do anything, no security light or anything, i thought the problem was my factory alarm because i would turn the alarm on and off a few times in a row and the car would start. but today they car wouldnt start so i kept turning the ignition several times without doing my usual alarm thing to see if its the ignition switch and sure enough after several tries it fired up. so im guessing its the ignition switch, is there a write up on how to re and re it so my first time will be a smooth one?

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93formula
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PostPosted: Tue Oct 02, 2007 10:25 pm    Post subject:   Reply with quote

update:

the intermittent problem has gotten worse, replaced both the ignition switch and tumbler, car wont start, no click, no security light nothing used to work if i sat there with the key in the ignition position but now theres nothing, any help.
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93formula
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PostPosted: Tue Oct 02, 2007 11:32 pm    Post subject:   Reply with quote

can this be my starter?
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Steveboos55
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PostPosted: Tue Oct 02, 2007 11:33 pm    Post subject:   Reply with quote

I am having the same problem, just not as bad as you. I will get into my car and if i go from off-acc-on-start too quickly, it will not start and the security light will blink. So now I either have the door open(so the message center says door ajar) or i slowly go from off-acc-on-start. Also sometimes I will start up the car and the security light will stay on the entire time the car is running, then it will go away the next time I start it up. I also have a 2000 Impala and the problem slowly is getting worse. This is one of the biggest pain's in the ass when it comes to Impala's, these security problems plague a good number of Impala's. Also I have noticed that if i try to start the car and it wont do anything, just get out, wait 10-15 minutes and it is fine, starts right up. I might just replace the ignition cylinder rather than the whole switch if it gets REALLY bad like yours is.

Stephen.

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93formula
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PostPosted: Tue Oct 02, 2007 11:47 pm    Post subject:   Reply with quote

im at my wits end, the thing with mine is though ive never seen the security light in these conditions, which makes me think its the starter, its the original starter as far as i know and it has nearly 275k kms on it so ill do some tests tommorow in daylight to verify if thats the problem.
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93formula
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PostPosted: Wed Oct 03, 2007 4:16 pm    Post subject:   Reply with quote

not getting a signal for the starter when the car is in ignition, anyone? BTW does the ignition and dash have to be put back together for everything to work? ive left it apart incase i have to chase wires back, the wiring and ignition switches are all connected though.
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93formula
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PostPosted: Wed Oct 03, 2007 5:13 pm    Post subject:   Reply with quote

okay im doing some of my own trouble shooting, using the starting wiring diagram. from the ignition switch it goes to the pcm crank fuse, ive checked both, the fuse is fine and the ignition switch sends out 12v when the key is in ignition, so now i need to check the pcm for voltage, pins 23 and 76 on C2, does anyone know which one is C2?
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93formula
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PostPosted: Wed Oct 03, 2007 5:23 pm    Post subject:   Reply with quote

okay i found it, i get 12v at pin 23 for crank request whent he key is in ignition, and i get about 6v at pin 76 for the crank relay control. on my way to the crank relay, but i swapped that out last night with another relay....
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PostPosted: Wed Oct 03, 2007 5:53 pm    Post subject:   Reply with quote

okay i checked the relay with wire extensions, turns out pin 87 is not getting power when the relay is powered up, if im correct pin 87 should get power from pin 30, so i may have a bad relay, but then why didnt this work when i switched relays with the fan control relay??....
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PostPosted: Wed Oct 03, 2007 6:10 pm    Post subject:   Reply with quote

two different relays and still no power to pin 30.....
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PostPosted: Wed Oct 03, 2007 7:47 pm    Post subject:   Reply with quote

five different relays all doing the same thing, whats wrong here!!!???
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bbengineer
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PostPosted: Wed Oct 03, 2007 7:52 pm    Post subject:   Reply with quote

If you have 6V at pin 76 (C2) on the PCM, then the PCM isn't commanding the Crank Relay to engage.

When cranking, the voltage at pin 76 should be 0 volts

When you replaced the ignition switch, did you do a security relearn??

I am kinda leaning towards a BCM issue... the PCM won't crank until the BCM sends a message telling the PCM that it's ok to crank because all security checks have passed

BBEngineer

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93formula
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PostPosted: Wed Oct 03, 2007 8:16 pm    Post subject:   Reply with quote

no how do i do the relearn? the security light hasnt flashed at me either though, the fuel pump etc turns on as well. so pin 85 on the relay should get 0 volts and ground out?
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PostPosted: Wed Oct 03, 2007 8:18 pm    Post subject:   Reply with quote

Security relearn is here: http://www.naioa.com/v2/module.....amp;pid=15

Yes, the PCM applies ground to engage the crank relay

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PostPosted: Wed Oct 03, 2007 8:27 pm    Post subject:   Reply with quote

i checked again, pin 76 yellow black according to my diagram from mitchel on demand and it has 12v i guess i didnt have a good ground last time i checked it. is there anyway you can verify if that indeed is the correct pin im supposed to be checking. any idea why its sending out voltage when it shouldnt be?
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