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-   -   Battery disconnected, things not working now. (

01740iLTony 07-29-2012 07:43 AM

Battery disconnected, things not working now.
I had the head liner and post recovered in my 2001 E-38. The person for some reason disconnected the battery. Now the key remote will not work, clock etc...are not set. Can anyone help or must I take the car in to have it corrected?

Thank you in advance for your help.

QSilver7 07-29-2012 10:39 AM

I slightly puzzled in how to answer or make suggestions. Are you saying you'd rather pay $110+ per hour to a BMW dealership to reset your car's clock than to read the instructions in your car's owners manual (and supplemental Nav manual)?

For example, even though I don't have Nav (btw...there's the small or wide nav screen which you need to identify when asking questions about it)...I do have this pic for some reason...and you can see the CLOCK prompt in the image...and I can almost figure out how to reset the CLOCK by reading the instructions for changing the date:

Please don't take offense...for instance, if you don't have an owners manual or the supplemental Nav manual...we have no way of knowing this unless you tell us. :) We can also tell you where you can download those manuals (if you don't have them).

Here's a freebie that you didn't mention...but may find out later may not work properly.
  • the sunroof may not work correctly after disconnecting power (see instructions below from the owners manual...which you may or may not have) exception need to HOLD the button for approx 20 seconds (5 seconds is not long enough)

As far as reinitializing your keys...see the instructions below that get posted about once a month...and as far as the "etc"'ll have to let us know what else doesn't work...again, we can't see your car...we only know what info/details you give us. :)

Some tips on reinitializing the remote keys that trip up many owners that just "skim" through the instructions:
  1. you must follow EVERY step exactly...if not...programming will more than likely fail
  2. have ALL or your remote keys with you during the programming session...any NOT there will no longer lock/unlock & arm/disarm your car remotely
  3. only insert the 1st key, start your other remote keys on STEP 3
  4. don't forget to REMOVE the key from the ignition (see STEP 2)
  5. KL R = ignition position 1 (not off, 2, or 3)

01740iLTony 07-29-2012 12:10 PM

Thank you QSilver7,

I was able to set the clock and the time and date. The sunroof is working now.

However I can't get the keyfob button to unlock the doors or to lock them. Center console button will not lock or unlock door also. Trunk will not unlock with keyfob. I did try the application you sent me but I may not have the key in the correct position (KLR). Can you explain this position better? I have the key into the switch position, next position turning forward lights up the dash board computer info read out and the nav system screen (the key can't be taken out in this position). Next is the position that all lights on the dash board light up and fan kicks in (key can't be taken out in this position). Next is the starting position with car turning over.

The etc... is I don't know what more to check for that may not be working.

Again thank you for your help.

setconstr 07-29-2012 01:20 PM

just read and follow the instructions carefully and you will get it, sometimes if while sitting in your drivers seat you do the reset with the key up towards your left shoulder it seems to work better ..... you'll get it just follow the instructions

01740iLTony 07-29-2012 04:47 PM

Thank you
I have everything working again thanks to all your help.. I knew I could count on Bimmerfest to get thess:) issue fixed. Have a Great week.

beast740 09-18-2012 01:48 AM

Hi all

1stly I must mention that you guys are brilliant

Please help

I have a similar Problem ,

I disconnected the battery to save some power as the battery is on it s last days

now as soon as I turn the ignition or start the car the head lights switch on also the indicator/flicker lights dont work and the dash board lights aswell

The light switch does nothing when i turn it on or off

Hope im clear enough

chrisn7 09-18-2012 04:45 PM

Well you've already diagnosed your problem - the battery has had it. You will get all sorts of weird effects once the battery is failing, and headlight coming on without the switch being in the headlight position is typical. Get a quality battery, and don'y skimp on the Ah rating

beast740 09-19-2012 12:59 AM

Battery disconnected, things not working now.
Hi there

Thanks for your reply

However I did get a new battery,energizer apparently its from Germany

and the car is still doing that

Im so confused and frustrated

Thank you

chrisn7 09-19-2012 02:21 AM

You might have a look here:

The indicators and headlights are both connected to the LCM -Light Control Module, which in turn is supplied power from several fuses. Start with these. Click the fuse number on the diagram, then follow the tree to the blue icon, and click that to obtain a pic of the fuse location...

beast740 09-19-2012 05:35 AM

Thank you once again

But I am still lost i opened the ling theres diagram when i click nothing happens and i dont see anything for a e38

beast740 09-19-2012 05:36 AM

Do you know by any chance where is the light module(LCM) located on a RHD e38

QSilver7 09-19-2012 09:57 AM

Same place as LHD...on the right hand side of the RH kick panel:

Without any build date or model year...I couldn't give any specific links directly to the LCM module for your car...but try the links below to find based on your model & model year...just click on the links & columns to work your way over to the LCM/LKM: components - control units & assemblies - light module (based on your car's specific build date info). :)

Good luck:

Online BMW TIS:
Online BMW WDS (wiring diagrams):

beast740 09-19-2012 12:18 PM

Quick silver you the best gonna check out those links now

thank you

beast740 09-19-2012 12:22 PM

one more thing QSilver from you experience what would you suggest is the problem with my car

oh btw its 98 model ,i think the build date is 28/06/98

chrisn7 09-20-2012 10:45 AM

In the link click the green component number when the cursor changes to a hand

beast740 09-20-2012 12:18 PM

thanks chris but when i open that liunks its just a diagram when i point the cursor theres no colours at all or even te hand cursor indicating that i can click on whatever

thanks once again

appreciate your effort

chrisn7 09-21-2012 02:36 PM

Ah, well you probably need to download Adobe SVG viewer then, which is needed to see the BMW WDS (wiring diagrams) as this opens within a webpage. This is worth doing as the WDS/Spaghetti is extremely useful once you get the hang of it...

bmw2qnj2le 09-21-2012 11:40 PM

I have the very same problem of loosing my BMW 740i settings when I have to disconnect the Negative terminal of my BMW in order to safely replace the oil cover gasket.
My BMW manual helps me to reset the alarm and I am able to drive it. I still lost my large NAV display and my radio only plays for 2-3 minutes then it cuts off. I can still manage to view the MPG display on the odometer cluster via the control on the steering wheel, but I could not able to set the clock.
I do not have the NAV manual. Did I blow the NAV fuse or the NAV system when I connected the Negative terminal of the battery back to the car? Please help or point me to the right directions to fix my NAV display.

Many thanks in advance.


Charrua 07-13-2017 05:07 PM

2001 740 IL. I just disconnected the battery for something and now the sunroof has no power so I can't reset it by holding the button for 20 seconds. Also the lights at the bottom of the doors are on WTF??? Does this sound like anything you've heard of? The whole thing started since I have a bad micro switch on the driver's side latch (infamous "door open" message) and so before I took the air bag out of the door I decided to disconnect the battery just in case. Little did I know that the sunroof wasn't going to work anymore. Is there a fuse for it? Do you think the GM III module failed? I held the button for 3+ minutes to make sure. Is there a special sequence to reset it or do all the doors have to be close and since my micro switch tells the car the door is open it won't let the sunroof think right? Im at a loss here. Any help would be appreciated.

QSilver7 07-14-2017 05:58 AM

See pics below for E38 fuse locations and fuse indicies (indexes). The illustration in each location reveals the fuse nbr & location within the fuse box plus the fuse's amperage. And BMW also gives you an alphabetical list of what the fuses are and their number. Use both the index and diagram to locate the fuse you need to check.

ENGINE BAY -fuse index and diagram is right next to the fuse's lid/cover

TRUNK - the fuses are behind the insulation above the battery...and the the fuse index is located on the back of the drop down door to the battery compartment

Charrua 07-14-2017 08:19 AM

Thanks QSilver7. Last night I checked the rear fuses and they seemed to be ok but it was dark. I'll check again today. I think #51 is the sunroof fuse as indicated in the back if the battery cover but there is no number to correlate it to in that rectangular fuse holder as in your picture. If the fuse is ok then I would be totally lost as to where to go. I guess maybe I could take the motor out and put 12 V to it to see if the module within it fried when I connected the battery's neg. post again. IDK where to go from here really. Where would check next? Not the GM module behind the glove box right? and then all the lights at the bottom of the doors staying on as well??? I had to remove the bulbs so my batter wouldn't drain over night. If you want to laugh at me a little... i went to put the rear window down and the regulator broke. I heard a big chunk fall out probably the plastic wheel. ALL this happened in 30 minutes!!!! I must have an ex with a voodoo doll on me! :-)

QSilver7 07-14-2017 09:39 AM

If fuse #51 is for the sunroof...then based on the illustration of the fuse box would be the 3rd fuse from the left (probably the yellow fuse in the pic...& I'm just guessing because we can't really see the slots in the pic :) Fuse #49 is the 1st fuse in the trunk's fuse box starting at the left (correlating with the illustration on the back of the door). If you have a lot of empty fuse locations in the fuse box...using the fuse's amperage and color can help figure out the fuse location...unless a previous owner replaced them...BMW uses the same color on all the fuses of the same amperage.

Charrua 07-14-2017 10:43 AM

Well, fuses are ok and there is power up to the sunroof motor plug. Easy to check since red and brown for ground are largeer than rest. I have another 01 740 so I'll swap motors and see if that does it and I'll post results. If is not the motor, then I'll just scratch my head all day here. Im sort of new posting and havent learned how to add a picture. It asks me for an url? Uh?

QSilver7 07-14-2017 11:48 AM


Originally Posted by Charrua (Post 10445073)
Im sort of new posting and havent learned how to add a picture. It asks me for an url? Uh?

There's multiple ways to insert an image in your posts. If you have images on your CPU or other device (smartphone/tablet/etc)...then you can upload them...but they need to have a smaller resolution than what most smart devices today take. For example, most smart phones take an pic with a resolution like 3589x2664 (or some other enormous resolution). Well, that's to much bandwidth for the handles images that are like 800x600 and less.

To insert an image that has been uploaded to a server or image hosting site...where it's been given an URL address [ h t t p : / / your pics URL address ]...then you can either (right click over the image) & copy the image's location/address/etc or click the COPY or SHARE tab/buttons the web site has for copying the image's address...then paste the URL address using the insert icon above...or if you know how to type/use HTML can type them then paste the URL address within the tags....then the images will appear in your posts:

Again, to upload an image from your CPU or other smart need to use the "attachment" feature. If you're on a CPU, then you need click the ADVANCED tab, then scroll down below the message box and look for the MANAGE ATTACHMENT tab. This will then allow you to upload your image(s)...but again, you need to stay within the resolution restrictions. So if your pics are need to use an image resizer to reduce them down to the allowable size.

If you are using the BimFest may be different. I rarely use the app so I'm not familiar with how to work around in it other than reading the forum until I can use the desktop version. (I'm an old fart...and like it the old fashioned way.) :D

Charrua 07-14-2017 03:43 PM

Well as it turns out it was the motor. Probably the module on it. I swapped it from my other 740 and it worked fine. I guess the jolt from connecting the battery fried it. What a relief!! Thank you for your support. Now I can help someone else who may have the same problem. Have a great day.

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