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Old 08-14-2009, 09:48 PM   #1
paul81
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2003 L-Series 2.2L Sedan
Wrench My battery is dead overnight

I don't know if other Saturn users had the same problem as I have, but any information is useful.

I have a 2003 L200 Saturn Sedan, and 2 days ago the care started to make some noises like the battery is dead, but still the engine turned on. Yesterday when I went from home to some friends there was the same sound, and again the car started, and get well to my friends, the problem was when I tried to come back home, after 4 hours of staying, the battery was dead. So I jumped it and started again. On my way home I stopped to Schuck's Auto and they verified the charging, an everything was ok. When I got home I turned off the engine and tried to turn it on again, and everything was ok, but after few hours when I tried to leave home the car needed a jump again.

Today I went to NAPA store so I bought a Test Light and I started to check all the fuses to see where I have a short, and I did that for about 2 hours, and when I got to almost all the fuses I finally found the circuit where all my power is going when the car rests. So I found out that when I remove the radio fuse out and the BCM CLUSTER fuse, there is no short. The problem is that the car won't start without the BCM fuse, it starts an runs for about 1-2 seconds and after that everything dies. I can live without the radio but not without the BCM. If I leave the BCM fuse in, the battery will die in few hours.

The question is if there is a problem with my BCM or is just a short somewhere along the way. And the same with the radio fuse do you think that I have to take off the cd/radio and look in the back maybe there is a short or it has to do with the BCM fuse.

And does BCM stands for?? I know is something like "body control module". And what does this BCM do?

Anything helps. Please post any suggestions or if you know how to fix it.
Thanks
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Old 08-14-2009, 10:22 PM   #2
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Default Re: My battery is dead overnight

Look in the tach or speedometer - is the security light flashing? When you turn the ignition key to the ON/RUN position, does the security light turn OFF or stay ON? It must be OFF to allow the car to start and run otherwise if left ON and starting, the engine will not continue to run; the factory Passlock anti-theft system disables the fuel pump from running to stop the engine from ever running. Pulling the body control fuse somehow enabled the anti-theft system that must be reset first while attempting to find the cause of any short circuiting, if any exists. To reset the anti-theft system simply leave the ignition ON for 11-minutes or until the security light stops flashing. This time-out with the ignition ON and (not starting) allows resetting the anti-theft system. After the flashing stops, turn OFF the ignition and now try starting - with the ignition in the ON/RUN position this time, the security light should go OFF as the other panel lights turn off, leaving only the seat belt, oil, battery, and brake light/indicators ON. NOT seeing the security light at ignition ON will now allow starting and running. You can turn your attention to the original problem; possible battery drain.

Is the battery the original one or a replacement? If original, its likely overdue for replacement and may be the cause of your suspicion of battery draining. The body control module (BCM) runs everything the engine control module (ECM) doesn't. It draws very little current in standby mode when the engine is off. The ECM runs the engine, the bcm runs almost everything else; cruise control, the Passlock anti-theft system, remote key entry, all the lights in the car, and the OBD II system to determine and communicate to an external reader whatever ails the car. The bcm cannot be left disconnected as its part of the vehicle Passlock anti-theft system that communicates with the ecm and transmission control module as part of the anti-theft system to prevent stealing and using any of the three minicomputers. When you disconnected the fuse to the bcm you disconnected electronic communications that the bcm needs to stay in touch with the other computers - disrupting the anti-theft system communications automatically enables it and locks you out from having the engine running. The engine can start but will only run for a few seconds that the fuel pump primed the fuel lines before dying. Exactly as you described.

Either the battery needs a full charge or is in need of replacing. Be sure the battery cables are clean and free of any corrosion too. And be sure the belt tensioner is taut keeping the belt from slipping and allowing the alternator to supply the electrical needs of the car while charging the battery. The battery and alternator can be tested by most auto stores.
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Old 08-14-2009, 10:35 PM   #3
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Default Re: My battery is dead overnight

The battery is charging when the engine is running, yesterday I checked it and was ok. I will go out to look if the security light is on or off.

But still what do you think about the radio fuse, do you think there is a short on that circuit?

If the problem is only with the radio fuse, why my battery dies when is the bcm fuse connected? Do you think that I need to leave it for those 11 minutes and then the problem will be solved? Should I take it to a dealer? this is my only car and i don't have too much money to spend with this issue.
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Old 08-14-2009, 10:51 PM   #4
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2003 L-Series 2.2L Sedan
Default Re: My battery is dead overnight

So I just came from my car and here is the result.

The battery is so dead that when I turn the key there is no light on the dashboard, except the yellow light which kind of an engine. Keep in mind that the engine was off for about 3 1/2 hours and the battery is dead.

Now when I opened the door I heard a flickering noise in the left side of the steering wheel. Because of that noise I think that there is a short somewhere, which is related with the bcm fuse, because the radio fuse I took it out.
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Old 08-14-2009, 11:03 PM   #5
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2003 L-Series 3.0L Sedan
Default Re: My battery is dead overnight

Is the battery the original 6yr old one? You may be obsessing over something that may not be an issue when you're not answering some questions. A faulty bcm can cause issues but if a dead battery is the issue the bcm may not be the cause of these problems. In order for the bcm to operate, it needs battery power and if the battery is a dead one nothing on the car will work correctly. If you can measure the battery voltage, what's the voltage now? If its below 12.5v, either the battery needs a full charge from a wall charger or you must drive the car for over an hour to have any charge occur with the alternator, provided the alternator and belt drive system are operating correctly.
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Last edited by fdryer; 08-14-2009 at 11:09 PM.
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Old 08-14-2009, 11:08 PM   #6
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Default Re: My battery is dead overnight

I think it is the original one, I have the care only for almost 2 years.

But that doesn't have to do with the flickering noise that I heard, and I think the battery is not the problem. I can buy a new one and the next day I'm sure that the car won't start.
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Old 08-17-2009, 10:50 AM   #7
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Default Re: My battery is dead overnight

Quote:
Originally Posted by paul81 View Post
I don't know if other Saturn users had the same problem as I have, but any information is useful.

I have a 2003 L200 Saturn Sedan, and 2 days ago the care started to make some noises like the battery is dead, but still the engine turned on. Yesterday when I went from home to some friends there was the same sound, and again the car started, and get well to my friends, the problem was when I tried to come back home, after 4 hours of staying, the battery was dead. So I jumped it and started again. On my way home I stopped to Schuck's Auto and they verified the charging, an everything was ok. When I got home I turned off the engine and tried to turn it on again, and everything was ok, but after few hours when I tried to leave home the car needed a jump again.

Today I went to NAPA store so I bought a Test Light and I started to check all the fuses to see where I have a short, and I did that for about 2 hours, and when I got to almost all the fuses I finally found the circuit where all my power is going when the car rests. So I found out that when I remove the radio fuse out and the BCM CLUSTER fuse, there is no short. The problem is that the car won't start without the BCM fuse, it starts an runs for about 1-2 seconds and after that everything dies. I can live without the radio but not without the BCM. If I leave the BCM fuse in, the battery will die in few hours.

The question is if there is a problem with my BCM or is just a short somewhere along the way. And the same with the radio fuse do you think that I have to take off the cd/radio and look in the back maybe there is a short or it has to do with the BCM fuse.

And does BCM stands for?? I know is something like "body control module". And what does this BCM do?

Anything helps. Please post any suggestions or if you know how to fix it.
Thanks
it might be charging, but it doesn't do any good to charge a dead worn out battery. no mystery here...just a dead battery. replace it.
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