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starcappy 06-29-2007 12:27 AM

98 740iL - All power lost to trunk
Recently I had my car boosted because of dead battery. Last thing I did before I realized battery was dead, was unlocked the trunk. Now the inside button, key button, and power assist on trunk are not working. Message on console says "Trunklid Open". What should I be checking?


M.Wong 06-29-2007 09:24 AM

Have you checked the fuses and the battery? A weak battery can cause strange things to happen in these cars.

Adi 06-29-2007 03:03 PM

Get battery checked and probably replace. Lots of people have had lots of different weird issues when the battery is on the way out.

Jmassa89 07-06-2007 02:23 PM

I have that exact same problem.. everytime i turn on my car it beeps and says trunklid open.. I haveto manually open it and its horrible.. I got mine checked and they sed I need a whole new pice that makes the trunk click closed..

ctweber98 07-11-2007 08:17 PM

Make sure that the lock is not turned to the valet position. If you take your key and manually unlock your car like you had to when your battery was dead, you probably have it in valet parking mode and therefore the only way you can open it is with the key and not by any other means (buttons, keys, etc). Check your owners manual for more details about this as I had the same problem and took mine into the dealership and showed me how to do it in a second.


m5james 11-08-2008 12:29 PM

So was there ever an official solution for this? Of all my searches on Google and all the messagesboards, this is the closest I have come to similar symptoms.

danosll 11-09-2008 09:10 AM

I had similar problem wires were broken in harness between body and trunk lid bad design.

m5james 11-09-2008 09:18 AM

I've had mine stop working for like a day once, it was embarrasing having to try and reach up inside the car every morning when going to work to get what I needed and have to rebungee it down. After a few good slams and some yanking up and down, suddenly it came back to life.

krockstk 11-17-2008 05:32 PM

try opening the trunk. disconnect battery. take screwdriver and close trunk latch. reconnect battery. use mechanical key in lock to open latch. my 740 had the same problem when I bought it. took a while to figure out, it was just confused. I have to do this every time the battery goes dead. (it sits alot) good luck, Tim

m5james 11-17-2008 06:52 PM

I found the steps after searching around some more using Google....basically did what you just suggested. Thanks.

tromp 01-11-2009 04:16 AM


Originally Posted by m5james (Post 3708380)
I found the steps after searching around some more using Google....basically did what you just suggested. Thanks.

My trunk motor stopped working so I can't close/lock the truck as of yesterday. I'm thinking I have the same problem as you. What were the exact steps that you did to "reboot" it?

m5james 01-11-2009 11:30 AM

To be honest, I don't remember exactly where I found it, and I'm replying via my phone. I'd start by looking on, then if no luck there, then try using Google.

When I did it I remember a few sites I found. One had me disassemble the lock and check to make sure the spring mechanism was intact, the other had me doing something like turning the trunk key while connecting the battery or something. Sorry I can't give you more at the moment.

tromp 01-16-2009 02:47 AM

Did the spring thing and it worked! Now I'm moving onto overhauling the breaks. Wish me luck.

m5james 01-16-2009 08:48 AM

Cool. Brakes are pretty easy, just depends on what you're doing sometimes though. If you don't have a buddy to help you bleed, you can build your own pressure bleeded for like $10.

tromp 01-17-2009 03:49 AM

Thanks. I'm going to change pads and rotors so i'll need to bleed. Tell me more about the build your own pressure bleed? I'm also shopping for the parts. I was dust free pads I know for sure.

m5james 01-17-2009 08:17 AM has a few write-ups. I went around to a few local stores (Wal-Mart, Ace Hardware, etc) to find a bleeder that could hold around a quart or so. Take your old brake master cylinder cover w/ you, then goto Wal-Mart or an automotive specific store and get a cap of the same size to drill and install a nipple to connect the bleeder to the cap. I might be getting confusing now, but these are pretty easy things to make. Either read up on or maybe even try using Google on how to make your own bleeder.

Ken Burkett 01-21-2010 07:10 PM

It Worked!
Thanks M5james!!
Disconnecting the battery and closing the lock with the screwdriver worked! appreciate the time you have taken to answer these posts. I was lost and ready to take it into the shop.
Thanks again!!

m5james 01-21-2010 07:42 PM

Glad I was able to help. Thank you for searching around for the answer and finding this thread instead of posting a new thread :) I'm all for thread revivals and keeping the information to fewer posts instead of spread all over the place.

I'm born and raised in Edmonds, so I've been able to go on a lot of Seattle5's and 7's drives. Marysville isn't too far, so you should get in touch w/ the guys and go on the drives...good bunch of people and fun meets, usually starting in Issaquah. Anyways, have a good weekend.

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