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Discussion Starter · #1 ·
2004 XC70 2.5T AW55

Bought used, only came with key and fob. Had dealer order new key and fob.
Took it in today to have them prgram the car to accept the new fob. They worked with it for about an hour and a half and the tech says that the CEM will not accept programming. So now I have a $160 key and fob that's useless, and I still need to get a spare.

I do have a functioning DICE/VIDA setup here at home, so I will attempt to diagnose the problem myself, rather than pay the dealers labor to do so.
I am aware of the TSB about the CEM connector being susceptible to water intrusion, and that's one of the first things I'm going to check.

Any other thoughts? Tech says he tried three times to get it to enter programming mode.
They asked if any modules have been swapped, to my knowledge no, and it came with extensive dealer records. They noted things like replacing headlamps and fuel pumps, nothing about a CEM, so I'd imagine it's original. One owner car.

now, that said I'm not going to rule out CEM weirdness. The other day I noticed that the cooling fan was running at low speed after I turned the car off and walked away. Fan turned itself off a few minutes later. I'm unsure if this is normal behavior or not. It will also self lock. Again, also not sure if this is normal behavior. So it may very well be that the CEM module is faulty and in need of replacement.

If that's the case I assume it must be programmed before the car will operate, so I'll be forced to find a replacement and take it to the dealer so I don't have to pay to have it towed 30 minutes down the road if I replaced the CEM myself.
 

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Sorry,I responded to you before reading your complete post.
What dealer? a Volvo dealer or somebody else?As far as I know,Vida/dice is useless to you.It will not program a key.Nobody other than the dealer of a locksmith with the software can get you out of this jam.finding a locksmith with this is rare.I know because I investigated this.You are stuck! You will have to buck up and pay the stealer for the programming.
The parts that were replaced and the cooling fan have nothing to do with your issue.And,it is common to have a cooling fan and/or a heater/ac fan run after exiting your car.That is something Volvo engineered into the car.forget about the cem,it is not your woe.
 

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Discussion Starter · #4 ·
I took it to the local Volvo dealer. An actual Volvo dealer with brand new cars on the lot and a big sign on the street.

Last week when I set up my DICE box I tested it and it worked.
I just tried it again to attempt to diagnose the programming issue and it's not that the CEM won't enter programming mode, it's that the DICE unit won't connect at all.

so in the span of a week I've gone from it all working just fine to broken and not communicating at all through the diag port.
 

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Discussion Starter · #5 ·
here's what it gave me last week.

[




So I guess now that I know it's not a programming issue but a general communications failure the thread title is wrong.

I'm getting no vehicle communication light on the dice unit.
 

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Discussion Starter · #6 ·
well I finally got the xemodex flowchart to show up.

coupled with the last DTCs I had from the door I'm going to open up the drivers door and see if the harness is damaged there and causing bus issues.
 

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Discussion Starter · #7 ·
so I poked the harness and my dice connected. I went to all of the modules and read life information, activated all the CEM controlled relays and all of that.

All working. So I suspect the CEM is fine, but the damanged door wiring is pulling down the can bus sometimes.

I'll have to open it up all the wa this weekend when it's light out and repair whatever is damaged in there.
 

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There's a menu in CEM communication which shows how many keys are paired. If it has reverted to 0 keys the CEM has lost the key/transponder information (which is the info from the glass chip near the key head)

Sent from my SM-N910G using Tapatalk
 

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Discussion Starter · #9 ·
it still read 3 keys.
The car seems to work perfectly normal, aside from the central locking being a bit wonky. At this point I'm nearly certain that the damaged door wiring is the culprit, but I didn't feel like working by shoplight.
 

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In Network tab of Diagnostics go to CEM module by clicking once on the CEM icon. Can you see the Diagnostic version, serial number and sw part numbers? If yes so far so good.

In Software Tab choose Advanced then choose CEM from drop down list under ECU information. Choose Read Hardware Number and Read Serial Number. Then Choose Send Program then after info is received choose Send Reset. This determines if the CEM is ready/functional to accept a download.



Sent from my SM-N910G using Tapatalk
 

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Some notes.
First Click on Send program
Then you can select necessary module and get info via read Hardware and Serial number
In the end click Send Reset.
If you able to get CEM's info that means module can be reprogrammed.
 

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Doublebug is correct. I was using a Vida image to get the info which wasn't connected to a car so I was a little uninformed at the time.

Sent from my SM-N910G using Tapatalk
 

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Discussion Starter · #13 ·
In Network tab of Diagnostics go to CEM module by clicking once on the CEM icon. Can you see the Diagnostic version, serial number and sw part numbers? If yes so far so good.

In Software Tab choose Advanced then choose CEM from drop down list under ECU information. Choose Read Hardware Number and Read Serial Number. Then Choose Send Program then after info is received choose Send Reset. This determines if the CEM is ready/functional to accept a download.



Sent from my SM-N910G using Tapatalk
this is awesome info.
I did see that it read the SW versions in the description, but I'm not yet handy enough in VIDA to know where to go to check advanced things like that.
I really need to sit down with the VIDA PDF and edumicate myself.
I'll try this stuff tonight.

I also found that it really doesn't like my old school battery charger being hooked up. It's ancient, and probably a little bit noisy.
Suggestions on a bench power supply to power it while I tinker? I was just going to buy a 30A adjustable voltage bench supply and wire it up. in the mean time I was going to hook up my fancy RC battery charger and set it to 13.6V and 7A, which is it's max current. it's probably significantly quieter on it's DC ripple.

thanks all.
 

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Discussion Starter · #15 ·
ok, I haven't done anything to the car.

Plugged in the dice, opened vida, followed the instructions and got this


I clicked on send reset, I heard relays click and the interior lights turned off. Then I heard some more relays click and things turned back on. I also noticed that now there are seatbelt warning lights ni the mirror. Neither my wife or I have ever noticed them, so I'm not sure if the PO had them turned off or what.
Anyway there appears nothing wrong with the CEM and it's behaving normally as far as I can tell.

I'll cal the dealer and schedule another programming appointment for next week, and I guess I'll take my laptop and my dice unit. Is it posible for them to download the firmware and then move it to another PC for programming? There seem to be options that indicate yes.
 

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I wouldn't bring the laptop in. All dealers know about unlicensed versions of Vida which is stealing their income and they also don't like their job described to them by a "newb"

Your version of Vida has no ability to program and won't authenticate with Volvo's servers and you can't use Vida to program without server access.

Your Dice tool has no bluetooth and this limits things in a workshop where they like to keep the laptops on the bench and always powered up.

Your Dice can program the car, though I read that even Volvo's servers are likely to detect that it's a clone.

I would try and get a more detailed explanation of what the problem is and see if they are patient enough to explain it.

Sent from my SM-N910G using Tapatalk
 

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Looks like first time the car did not go to the prog mode. In this case just press Send Prog once more.
 

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Discussion Starter · #18 ·
I took that screenshot before i clicked on send prog.

I was all thrilled that I could read the info, it made me fell good that the CEM is not failing.
 

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Discussion Starter · #20 ·
and the saga continues.
Arrived at dealership quarter to 2. They rolled it into a service bay, I sat in the waiting room until 5 PM or so until I wandered out there to see WTF was going on.
Tech is on the phone with the Volvo field specialist, they're trying a work around for a known issue. Doesn't work. Conclusion?
New Volvo diag software/adapter doesn't like older cars. I assume because the 03/04 years used the low speed bus. So they want me to bring it back next week and drop it off first thing in the morning so they can collaborate with volvo and fix the software.

I'm of the opinion that I should not be paying to diagnose Volvo software issues, I brought it to a dealer because they were supposed to have the right tools to do this. So i'm going to call the service manager and see what they say about the billable hours. I think Volvo should be paying the tech to help them sort out their software. I'm sure that the regional rep has a slush fund for customer satisfaction, and right now I'm not too satisfied after wasting 7 hours at a dealership and still not having a working key.
 
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