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Old 09-08-2010, 10:16 PM   #1
GAGT - Member
AKA: Greg
Join Date: Oct 2006
Location: O'fallon, MO.
Posts: 167
Vehicle: '05 SC/T
gregraisbeck Gettin' there
I've replaced everything, what's next?

about 2 months ago my car wouldn't start for me. This was a first for the car. I was told that my bcm was shot due to my aftermarket alarm not being properly grounded. I got a new bcm and had it programmed and nothing. Since then, replaced the ignition and now a sdm but nothing seems to do anything for me. Now the bcm clicks and the dome light flashes when the battery is attached, stop when i turn key to run position but I have no lights or anything on dash.

Please help me what else can I do to get back on the road?
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Old 09-08-2010, 11:02 PM   #2
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Join Date: Jan 2008
Location: Freeman Missouri
Age: 29
Posts: 411
Vehicle: 00 GAGT, 79 Jag XJ6
GA2000GTSpeed Gettin' there
well you BCM probaly was okay. Ever take the starter off and have it tested? Sounds like you might of had a simple fix but made more due to replacing random stuff.

did it turn over or just do nothing before? Did the security light come on before when you tried to start it?

Heres a rule of thumb: when something goes wrong do not blame it on the computer, start simple and work your way back into the complicated stuff.

Sounds like the BCM is programmed wrong or something. Where did you get the BCM? and why did you have to get it programmed?

And when you say you replaced the ignition do you mean that you replaced the ignition switch that the lock cylinder goes into? and what do you mean by sdm?
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Old 09-09-2010, 06:35 AM   #3
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AKA: Greg
Join Date: Oct 2006
Location: O'fallon, MO.
Posts: 167
Vehicle: '05 SC/T
gregraisbeck Gettin' there
the day the car wouldn't start it wouldn't crank or anything. i had the starter tested and it was ok. the bcm began clicking and the security light was on. I got a bcm from and had it programmed with a tek2 at a dealership. After the bcm was replaced the car wasn't fixed but the clicking went away. I was told to replace the ignition switch so I did and nothing. I towed the care to the dealer and they said my sdm(airbag module) wasn't communicating with the computer and I needed to replace it. Done that, still not starting,, cranking, anything.
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Old 09-09-2010, 08:14 AM   #4
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AKA: Nick
Join Date: Dec 2008
Location: Tonica, IL
Age: 28
Posts: 1,886
Vehicle: 03 GAGT/98 Chevy 1500
burgett2103 Gettin' there
so it doesn't click at all? if you still have original battery, i would suggest replacing that.

any service engine lights?

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Old 09-09-2010, 09:58 AM   #5
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AKA: Greg
Join Date: Oct 2006
Location: O'fallon, MO.
Posts: 167
Vehicle: '05 SC/T
gregraisbeck Gettin' there
No clicking when trying to start. There was a service vehicle soon light after it first happened but went away after new bcm was programmer. Security light came on so I replaced ignition lock and performed relearn and it went off. Battery is newer, like 2008
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Old 09-09-2010, 12:27 PM   #6
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Join Date: Dec 2007
Location: Ottawa, Ontario
Posts: 214
Vehicle: 2003 Grand Am GT
Pauljp Gettin' there
To get right down to the basics.
Your starter is grounded to the engine block.
There are two large and one small terminals on the starter solenoid.
One of the large wires is the big red cable going directly to the positive side of the battery, the other goes to the alternator.
The smaller wire comes from relay 11 in the fuse block under the hood.
If you were to put 12vdc directly to the smaller wire at the starter, it should activate the solenoid and the starter should turn the engine.
The engine won't actually start because everything else is off, but at least you will know that the battery, starter and solenoid are fine.
It doesn't have to be a huge wire since you are only triggering a solenoid.
Do it safely and quickly just to see if the engine is turning over.

Depending on what happens, it will tell us several things:

1. If the starter turns the engine then your battery, cables and starter are fine. Now we have to look at the next device up the line, the starter relay #11.
2. If nothing happens, and you said that the starter was tested ok, then the only thing is can be is a dead battery or bad cables, which includes the ground cable from the battery.
3. You should hear the starter solenoid engaging, like a relay click. if not, then it's the starter.

Let us know what happens and we can go from there.
Good luck.

Last edited by Pauljp; 09-09-2010 at 01:27 PM.
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