Trunk issues

[NCG]

2014 mkz 64000 miles.Trunk quit opening.Fob,dash nor bumper button will open it.Lights light up,after i crawl thru the trunk to open it,the system knows its open.Also,in the settings menu,it will not allow me to engage the power decklid.This car is a piece of shit.im considering fouling my credit and letting this thing go back.It gets 22mpg on the highway,check engine light is on because of converter,theres 4 recalls,but none of the parts are available to repair.Lincoln is junk.I guess im gonna tie a string to the emergency latch and let it hang out the back so i (and anyone else) can open my trunk.I wished i would have listened to everyones warnings.

Edited November 16, 2021 by NCG

[TomV]

I haven't had to troubleshoot mine yet, but the trunk actuator has its own electronic module. Maybe it's as simply as a loose electrical connection. Sometimes there are short ground wires to the trunk frame/body from these modules. Pull the left side trunk panel and look for ground connections. If found... unscrew them, clean off any corrosion, scrap any paint contacting the connection and see if that helps. Unplug the trunk module connection and examine for corrosion or pins that look bent or pulled out of the connector. These steps won't cost anything, but a little time.

 

The network in the car is CAN bus. It's a powered network that all  the modules communicate on. If you have a laptop and an OBDII adapter, you can use ForScan software to look for errors from the trunk module itself.

[NCG]

Thank you.It worked fine until yesterday morning.I dont see how it could have suddenly come up with a ground issue,or any connection issue overnight.As i said,it wont even let choose the option to enable the power decklid in the settings menu.If i cant turn that on,how can i tell if its a connection issue?

[TomV]

If you can't turn it on, the trunk module must not be responding to the rest of the system.

 

So unless it's a really a "bad" module, it might be a connection issue.

 

Trunks can hold water and moisture. Items placed in trunks can also snag exposed wires. Ground connections are usually out in the open. It could have been corroding slowly for a while and finally got to the point its losing connection. You can also check the user manual for the fuse location and check it.

[TomV]

These checks are easy and free. You could always pay a mechanic to do it, but I figured you were looking for troubleshooting tips.

[TomV]

Found a picture of my trunk left side when I was messing with the modem.

 

I'm not sure which one of those other modules is the "trunk module", but see all of those purple ground wires connected at one point?

 

Make sure that one point and any others are getting a good ground connection to the body/frame.

 

 

[NCG]

I gotcha sir.Thank you very much for your input.It had been a minute since i had been in the trunk,if corrosion occurs,could it be bad enough to seize the loop that pulls it down?(Assuming it pops up upon opening the decklid?)Im also guessing the trunk ajar sensor isnt apart of that mechanism.When i crawl thru and pop the trunk with the emergency cable,it knows that its open

[NCG]

Well,dunno if this will help anyone,but put a scanner on it.Scanner didnt even pick up the module("option is/may not be available,check connection on scanner")So,the module isnt working period.I can find a new module,but i guess im screwed because no matter what,they'll have to flash it.And only the stealership can do that,right?Plus,they wont just flash the system for me,they'll HAVE to get their $100.00 diagnostic charge.(Apparently its the same issue as everyone else,i was just fortunate enough for the system to quit while it was disengaged,so i didnt get the dead battery)

Edited November 20, 2021 by NCG

[TomV]

If you pick up a "used" module from a junk yard, it shouldn't need programming.

[17MKZ3.0TT]

5 hours ago, TomV said:

If you pick up a "used" module from a junk yard, it shouldn't need programming.

Mechanic (brake shop) told me that's how he understood it, also. A used one from a same type MKZ already knows it's a trunk module, and they don't need to match a VIN like an ECU, etc. does.