[DR92OR]

The trunk latch on my 2014 328d xDrive will not unlatch using the rear handle, front trunk latch button, or the key fob. My vehicle does not have a key lock on the trunk. I have verified that the valet lock is off. I have checked the wiring for any sign of broken shielding or loose connections. There does seem to be voltage going across the wires. All trunk lighting is working when the actuator is unlatched using the emergency trunk release. I replaced the actuator and have checked all fuses in the back of the vehicle. The battery on my vehicle is 9 years old, but everything else functions fine and I've never had trouble starting the car. Any thoughts on what could be happening? Is there something I'm missing? (To be clear the trunk latches fine, but will only unlatch using the emergency trunk release).

[DR92OR]

I have since replaced the battery out of misplaced hope that would solve the electrical gremlin. No joy. Probably next step would be looking at replacing the wires? After that who knows...

[mario123]

Originally Posted by DR92OR

I have since replaced the battery out of misplaced hope that would solve the electrical gremlin. No joy. Probably next step would be looking at replacing the wires? After that who knows...

Hi matey, just wondering if you got to the bottom of this issue. I have the same issue and its doing my head in. I have replaced the actuator but no go. I have also ruled out the wiring harness. I am beginning to suspect the REM module.

The thing is though I am seeing 6.8V at actuator cabling when i hit the trunk button.

[Alpine-F80]

Originally Posted by mario123

Hi matey, just wondering if you got to the bottom of this issue. I have the same issue and its doing my head in. I have replaced the actuator but no go. I have also ruled out the wiring harness. I am beginning to suspect the REM module.

The thing is though I am seeing 6.8V at actuator cabling when i hit the trunk button.

Any luck yet? I'm in the same boat...about to try buying a used trunk lock actuator. All the wiring & fuses seem fine. Swapping the REM (without coding) did not fix trunk opening issue as I've read it should, so I'm wary to code the new one without verifying it's not just the trunk lock actuator.

[erozario]

Originally Posted by DR92OR

The trunk latch on my 2014 328d xDrive will not unlatch using the rear handle, front trunk latch button, or the key fob. My vehicle does not have a key lock on the trunk. I have verified that the valet lock is off. I have checked the wiring for any sign of broken shielding or loose connections. There does seem to be voltage going across the wires. All trunk lighting is working when the actuator is unlatched using the emergency trunk release. I replaced the actuator and have checked all fuses in the back of the vehicle. The battery on my vehicle is 9 years old, but everything else functions fine and I've never had trouble starting the car. Any thoughts on what could be happening? Is there something I'm missing? (To be clear the trunk latches fine, but will only unlatch using the emergency trunk release).

I have also been having similar issues, ordered an OEM latch and the trunk still does not open through any of the 3 methods, valet mode is confirmed off. Will be troubleshooting over the next three weeks, please do let us know if you discover the issue.

[Aali335]

Hello any luck as to what the issue might be I am experiencing the same thing in my 2015 335i. Valet switch is off and neither the key fob or latch works. Trunk was working fine before. I noticed it one day after remembering I closed my trunk the trunk was swung open. After closing it I realized none of the buttons were working to release it again. Only way to open it was with the emergency cable. Please do let me know if you find fix. I had a local shop take a Quick Look with voltage readings and the tech wasn’t able to find anything.

[king075]

Same problem as others here. 2015 335i. I also tried replacing the latch mechanism. Wondering if the system gets into the valet mode independent of the glovebox switch.

[king075]

Originally Posted by mario123

Hi matey, just wondering if you got to the bottom of this issue. I have the same issue and its doing my head in. I have replaced the actuator but no go. I have also ruled out the wiring harness. I am beginning to suspect the REM module.

The thing is though I am seeing 6.8V at actuator cabling when i hit the trunk button.

Is 6.8v expected? Should it be 12v?
Do you have a wiring diagram for the latch mechanism you could share? I'd like to test mine.

[ScubaSteve]

i had a similar issue after getting into a small accident a few years back. Turns out the car was just in valet mode, and the dealer fixed it in just a few minutes with a coding tool for no charge. hope that helps

[itspeat]

For anyone else struggling with this issue and not being able to solve it... I was unable to open the trunk with the key fob, interior button, or the button on the trunk.


However, I was able to release the trunk using ISTA. So I figured that the primary electronics are fine.


The trunk lock switch in the glove box was in the 'unlock' position, so at first glance someone may not think to look there twice. I flicked it back and forth between locked and unlocked a few times and it did not help. So, I decided to use some pick tools to remove the button and unplug it altogether. Suddenly, all of the trunk release buttons started working again, so somehow this trunk lock failed, even though the owner never even uses it to disable trunk access. Pretty interesting.


Hopefully someone else finds this and starts there before tearing into the wiring too much.