I am having an issue first thing in the morning, when unlocking the car none of the functions on right side of the car work, windows will not open, right side mirror does not fold out. I drive the car to work (20 min drive) still nothing, I can come back to the car 2 hours later and everything is fine. Driving me nuts. I believe I might have had a couple of occurrences of the car not locking but all doors are shut (2 beeps).

Any help appreciated, I have taken the car to the dealership and they replaced a door controller but same issue.

 

All of the symptoms you describe match with either a door module or wiring harness fault (could be a connector that is making intermittant contact).

Obviously the front right door is affected as you mention the mirror. Is the rear door also affected? Which door module was replaced? If you confirm those then I can look at the schematics to try and find a common link.

Also, if it is both doors that appear dead when this happens, can you try opening each affected door window using the switch pack on that door without opening their respective doors by the handle (lean over and press the switches).

 

Xdave thanks they replaced c2d1739 which says switchpack door passenger side door. They said mirror motor not set. Yes both front and back right side affected but only from the drivers side controls also locks on the right side did not lock/unlock from the center(radio) location.

 

First things first, check the battery voltage is not dropping too low as that can cause strange electrical issues. It would be odd for the issue to be so repeatable, but it is quick and easy to rule it out.

C2D1739 is the driver door switchpack (the one with all four window switches and the mirror adjustment), not the passenger side.

Each door has it's own module that controls the functionality of that door. Most of the signals sent from the car, whether software or switches, are sent to the door modules over the MS CAN network. That includes the mirror fold and movement commands, door lock/unlock, and remote-activated window control.

The switches local to each door are hardwired to the module so bypass the CAN network. That includes the local window buttons and door handles.

As your windows work from the local switches it sounds like you have a network fault.

It would be unlikely to be a door harness connector issue as the front and rear doors have their own connectors and independant connections to the MS CAN network.

It is also unlikely to be the power supply to the door modules as that would prevent the local controls from working.

The replaced component (driver door switchpack) communicates with the driver door module via a local LIN bus (single wire serial data). The driver door module then sends any remote commands out over the MS CAN network to the other door modules as needed. As the switch pack has been replaced, and as both right side door modules failing together would be unusual, I would suspect the driver door module may be faulty but it would need to be tested first.

However, there is no way to be certain that is the fault. If the two mislocking beeps you are hearing occur after one second and not immediately then they are telling you that at least one door is not centrally locking. The central locking is controlled by sending messages over the MS CAN network by the KVM. The individual door modules then carry out the locking and send back the confirmation to the KVM over the same network. When the KVM does not receive one or more of those messages, or receives one that says "my door was not locked" then it generates the two beeps. When that happens, remove the key from the range of the car and try each external door handle in turn until you find the door (or doors) that have not locked.

Please do that test and report back with which door or doors are unlocked. Note that you will set off the alarm when opening the door so be quick to test the other doors and do try it late at night!

There is a common fault with the Volvo latch mechanisms fitted to the X351 and many other models that can cause the mislock symptom and be indpendant of your other fault, so it may be a coincidence, so the result of your test will help to see if it is linked. (i.e. if it is both doors that are not locking then it is logically linked, but if it is just one or a different door altogether then it likely wont be.) You say "the locks on the right side did not lock/unlock from the center(radio) location" which does suggest they may be linked to the fault, but it doesnt hurt to check via a different method.

I would also like you to test global open/close of your windows, as the MS CAN network command that operates those is sent via the security system and not the driver door module, so if global open/close does not work it would suggest a network fault elsewhere. (Global open: Hold the unlock button on the exterior door handle or keyfob for a few seconds and the windows should all open. Global close is the opposite.)

Finally, are there any other symptoms of something wrong with the car? If you have the rear climate control panel fitted to your vehicle (the rear LCD) then use the front touch screen to change the rear temperature and settings and confirm the rear panel is showing the changes correctly. Also check the rear seat heaters/cooled air work if fitted.

Is your dealer doing the work under warranty, or are you paying for yourself? I am surprised they did not do the diagnostics themselves. There are defined tests they can perform with their diagnostics software (SDD) to locate the fault. If there is a generic network fault it should be visible through SDD and each door module can be independently tested. I would hope to see multiple DTCs being logged for a network fault.

 

The mislocking beeps, The right front and back doors were unlocked, did the same thing multiple times.

just before switching the car off, the right windows were not working also from the drivers side, but worked from the right side of the car.

 

Looking over the schematics with fresh eyes I note that the latch motor is hard wired to the KVM as well as the respective door modules. That may be for the quick-latch function used with the keyless entry system, or it may be for the central locking commands (although I think those come from the door modules, I do not know for certain).

I also note that the two rear door modules do not appear to be connected to the MS CAN network, only the two front door modules are shown as connected in the schematics. I did not realise that when I wrote my previous reply.

If you want to check the more obvious wiring, start with the LIN wire between the driver door module and the rear door modules. This is because it looks like the rear door remote functions are controlled over that wire in the absense of an MS CAN connection to those doors.

Driver door module connector CAPW02A/20 to rear right door module C7PL01/20 should read very low or no resistance with the vehicle power off. If you have open circuit or any notable resistance suspect a connector in-between. The passenger front door does not appear to use this wire, so I'm expecting this to be fine.

If that wire is ok, then the driver door module would be the next suspect. That will be a programmable part so should be changed by a dealer or someone with SDD access. They are not particularly expensive parts - £80 at the parts counter in the UK. I can't reconcile that with the door mislocking though it is possible the driver door acts as a comms master. Still doesn't explain why the front passenger door would be affected though.

I have attached a series of PDF documents to this post that may be of interest.

EWD-X351-501-14-Keyless entry - Rear
EWD-X351-501-14-Rear dead locks
Both useful for showing the wiring between the door modules, latches and the KVM. I picked the rear doors because they are the simplest.
Note that in the US you will not have dead locks, however I don't know if the central locking side is shared.

EWD-X351-501-11-Window lift-rear
Shows the local connections, probably not much use but is there for completeness.

EWD-X351-418-00-MS CAN bus-LHD
I've inlcuded the entire network, but 1 (driver door) and 3 (KWM) cover the modules we've mentioned. As the rear door modules are not mentioned I do not think it is a CAN fault.

WSM-X351-501-11-Glass Frames and Mechanisms Diagnosis and Testing
Not much to test in this one, but it does explain why the dealer did what they did.

WSM-X351-501-14-Locks Latches and Entry Systems Diagnosis and Testing
Worth taking a look at the tests for no lock/unlock from key-fob, but I suspect test C3 will show no signal which will require SDD to progress.

This should be an easy fault to diagnose with SDD connected - maybe an hour of dealer time to narrow it down. You mentioned your dealer replaced the driver door module - did they attempt any diagnosis prior to or after that? My pet peeve with dealers is that they often don't bother to test for symptoms afterwards, but I digress...

Has anything happened to the vehicle before these faults occured? Water ingress, an accident, etc?

 

I know this is somewhat off the subject of this thread, but can the soft door close latches be installed on 2014 and earlier x351s?

 

xdave,

Thanks so much, I have an appointment for the car on tuesday, I believe I had narrowed the car not locking to only the front right (passenger) door (on the two beep issue)

Issue with the unlock function, right windows, right mirror first thing in the morning still occurring, 2-3 hours later everything is fine.

But also I have noticed that the rear camera will not work sometimes, or it will beep while driving and say that It is not functioning and contact dealer. this has happened 8-9 times while driving and at any time.

Trying to find out if all are connected, The car is immaculate, 20k miles, and no water or damage.. great car other than the gremlins.

What should I tell the dealership to look at, I feel they are just waiting for the warranty to finish...

 

As you mention that the car is under warranty, tell them to keep it until it is fixed.

First they should hook it up to a computer and run the diagnostics. I suspect that will narrow down what appears to be a comms issue.

Then if the door latch is not working it should be replaced as there is a common fault with the Volvo latches used in these (and many other) cars where the mechanism wears.