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Old 05-04-2015, 10:57 AM   #1
spafoux
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Electrical system DEAD

Soooo, I was changing the General Module 5 in my BMW 328i 1998 and I didnt think of disconnecting the battery.
And now, EVERYTHING is dead. When I turn on the ignition nothing happens, and no lights are working. Basically, everything is dead.

Has anyone had this problem? If so, how can I fix it? Any ideas?
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Old 05-04-2015, 11:26 AM   #2
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You need to diagnose this by looking at the fuses and the voltage seen at different places.

Check your fuses in the glovebox and your E-box in the engine compartment.

Verify 12+volts at battery and then at your fuses.

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Old 05-04-2015, 11:32 AM   #3
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All the fuses are intact. Do you mean that I should verify that it comes "power" from the battery to the fuses?

I saw someone else with the same issue, and he solved it by just disconnecting the battery and waited for a day, and then everything worked fine. I'm doing the same thing right now, do you think it solve the problem?
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Old 05-04-2015, 12:51 PM   #4
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Yes you should verify power at the fuses and make sure your fuses are intact in the E-box.

No, i dont think waiting will do it. You could have damaged your new EWS. If someone else has the exact situation, you should try it.

Tell us the voltage you see at the battery and at the fuses.

I am out of town and dont have the schematics to tell you specifics.

Last edited by BMWCaptain; 05-04-2015 at 12:52 PM.
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Old 05-04-2015, 03:19 PM   #5
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Do a simple test light to confirm constant power from the battery at your ignition module first at the fuse for the ign. If you have power from the battery there then move onto the relay for the ign. Find the ign relay. Pull it out. Look for the constant power pin. Then turn the key on and probe the other pins....you should have another energized pin there.

I would recommend a professional if you cannot find the problem. You need access to detailed wiring diagrams and be able to trace circuits....apply bypass voltage to some...you really need to know what your doing or you can cause more harm.

I don't think your electrical system is dead. The electrical engineers always make great fail safes because they know people will most likely tinker with their cars once they're out of warranty. No pun intended.
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Old 05-04-2015, 04:42 PM   #6
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I've checked the voltage on the battery and at the fuses, they both showed the same. But they only showed 4.2V, and it sank to 3.7V when I was there. Now it is charging. I hope that this is the problem.

I'll post a reply when it is fully charged. Thanks for your answers!

Last edited by spafoux; 05-04-2015 at 04:43 PM.
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Old 05-04-2015, 05:15 PM   #7
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So you found the problem. Your overall system voltage was low from a bad or not charged battery. Don't let the alt. Charge the battery. Wait until the battery charger completes the charge.
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Old 05-04-2015, 05:30 PM   #8
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Quote:
Originally Posted by spafoux View Post
I've checked the voltage on the battery and at the fuses, they both showed the same. But they only showed 4.2V, and it sank to 3.7V when I was there. Now it is charging. I hope that this is the problem.

I'll post a reply when it is fully charged. Thanks for your answers!
That is the exact reason i always want to know voltage value. You can have power, but not enough.

Charge your battery to 12.6 volts or above, then try again.
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Old 05-04-2015, 11:45 PM   #9
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Quote:
Originally Posted by spafoux View Post
I've checked the voltage on the battery and at the fuses, they both showed the same. But they only showed 4.2V, and it sank to 3.7V when I was there. Now it is charging. I hope that this is the problem.
3.7-4.2V is very very very low. First, something must be wrong in the car to drain the battery down that low and second, the battery is probably on it's way out. A lead acid battery should never be drained below 10 volts otherwise it's life will be greatly diminished due to sulfation.
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Old 05-05-2015, 12:43 AM   #10
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may seem like a stretch but the only thing that has made my battery go flat like that was my blower motor resistor...yours could've just coincidentally gone out at the same time you changed the module.
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Old 05-05-2015, 03:15 AM   #11
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Just want to say a big thanks to everyone who helped me, especially BMWCaptain! The battery is still charging and I will let you know if everything works when it is fully charged.
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Old 05-07-2015, 08:45 AM   #12
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So the battery charged up to 10.4V, it was charging for 2 days. When I disconnected the charged, the battery went down to 5V. I guess this means that the battery says good night.
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Old 05-07-2015, 12:44 PM   #13
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That is Great! You found the problem and it was your battery that crapped out on you. Could it have been the cause of your GM5 problem?
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Old 05-07-2015, 12:59 PM   #14
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So the battery charged up to 10.4V, it was charging for 2 days. When I disconnected the charged, the battery went down to 5V. I guess this means that the battery says good night.
How old was the battery?
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Old 05-07-2015, 02:16 PM   #15
spafoux
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That is Great! You found the problem and it was your battery that crapped out on you. Could it have been the cause of your GM5 problem?
I dont know how the battery could cause the gm5 to freak out since everything else worked just fine. I could even play music with another head unit and subwoofer without problem.
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Old 05-07-2015, 02:16 PM   #16
spafoux
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How old was the battery?
I dont know, it was in the car when I bought it.
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