Just Bought - Volvo V70R, srs codes "control module missing"

[awdsubaru]

I see that your in Alberta. Since your grabbing at straws right now, might I suggest possibly calling the "volvo Doctor" as he calls himself. He is in Ontario, so obviously he cant work on the car, but all he works on are volvo's. He has helped me in the past with some problems on the phone, and he might have heard of what your experiencing, and at least point you in the right direction. Its worth a long distance phone call IMO. 905-689-4155 His name is Thomas.
Best of luck.

[jimmy57]

I work on network communication problems with these cars. There is no good way to get close to a repair without VIDA. With VIDA you can see what is happening and use the tools in VIDA to evaluate what is happening. The person using VIDA must have great understanding of the network and VIDA.
When the network is being shut down by a failing module or a wiring fault then certain modules will have to be disconnected and then the remaining modules checked for response. Some of the modules on P2 low speed network are pass-though modules so when they are unplugged that module and the modules past it are off line. The network may not work with those modules off but there is a tool in VIDA that allows you to PING the modules and when none were responsive and with a pass through module unplugged you get the remainder of modules responding to the PING then you have found the offending area of network. The voltage of the two network leads is also used as a check. Once an area is ID's then jumpering connectors and unplugging modules and doing the PING test will let you find the module or wiring section. IF the fault is intermittent then it is MUCH harder to find.

[Domo]

I will give him a call on tuesday thanks.


I changed the battrey, no luck still losing lights for a few seconds during start up on the instrument cluster DIM, climate control CCM, and drivers power seat PSM, yesterday it was started lost lights got out of the car, slipped on the ice slammed the door and the lights came on. tried it again (minus the slipping) and it worked again, slamming the door seems to move something, make a connection, not time related i tried waiting longer and slamming the door still helped I'm not sure why. SRS light is still onI havn't got the codes reset yet waing for DICE and laptop to arrive. Can anyone tell me where the PSM, CCM modules are I heard I can elminate one or the other by unluging one or the other to see if the light function returns to normal, Should I disconect the battrey before unpluging the module?

I hope when I get VIDA I can understand it and fix the problem.

[Domo]

I have access to vida now, (learning how to use it) I've spoken to the volvo doctor, he is thinking the cem could be the cause of the problem.

More codes this morning, problem seems to be getting worse now and more frequent, possibly because of the cold, I had to reset the codes twice within two hours yesterday evening. The car was shut off for a hour outside in -15c. Codes are as follows. Upon start up no lights on DIM and CCM then a few minutes later all lights come on and the srs urgent light is on.

BCM-0109 Communication between control units communicational problems with sas

ECM-660B MIL signal missing

CEM-1A54 communication with PSM control module signal missing

CEM-1A55 communication with CCM control module signal missing

CEM-1A56 communication with DIM control module signal missing

SAS-000B Control Module internal fault

SRS-00D5 SRS lamp signal missing

SUM-0337 CAN-signal SAS control unit faulty signal.


I hope the frequency of these codes and the additional codes last night well help us, hopefully point towards a possible cause, I'm thinking the cem still


What do you think?

[jimmy57]

The transistor circuit or relay that powers up fuse 10 seems to be the issue. Those items you are losing relate to the same power source or the to the module that can interrupt CAN to the module. The CEM may need to be replaced but the CEM power supply to the fuse 10 may be traceable and you may find solder joint issue or a soldered in place relay with a Radio Shack relay that can be soldered in to fix issue. I have not repaired a Gen 2 CEM yet.

[Domo]

I checked the ground its good, I got the same codes last night too, I checked the voltage of fuse no.10 on the cem since it powers the dim,ccm,psm I got 14.4volts the DIM and the CEM are off no lights no function, nothing. then I switched the car off as a switched it off the DIM and CCM lights flashed as the key was in postion 1 then I started the car again everything worked as normal, but have the srs urgent light on again as i expected. I know that seeing 14.4 volts at fuse no.10 was not what I was hoping for, I was hoping I would see no voltage during the fault, But I'm still leaning towards the cem being the fault, I think it might not be distrbuting its power correctly, sometimes if you leave the car running the DIM and CCM, and PSM will start working on their own but it can take up to ten minutes, its quicker to turn the car off and try again all test are being done in aprox -15c, any more ideas?

PS when I first went to start the car postion 1 evrything is normal, postion 2 everything is normal, when go to postion 3 when the greatest load is on the car thats when the fault occurs. Its like the car is turning the DIM,CCM, and PSM off to insure the car starts.

[Domo]

The transistor circuit or relay that powers up fuse 10 seems to be the issue. Those items you are losing relate to the same power source or the to the module that can interrupt CAN to the module. The CEM may need to be replaced but the CEM power supply to the fuse 10 may be traceable and you may find solder joint issue or a soldered in place relay with a Radio Shack relay that can be soldered in to fix issue. I have not repaired a Gen 2 CEM yet.

this sounds interesting

[Domo]

UPDATE

I took a gamble and removed the cem sent it to xemodex, no usual fault was found with the cem. a new fault they had not seen before was occuring. they wanted to keep my cem as a test unit. they were good enough to replace my cem. I am happy to say it is installed and no faults yet 24hrs has passed with multiple trips out in the cold -20c with no faults so pleased so far highly recommend xemodex the tech support and service, are second to none.

[MadeInJapan]

Awesome that this seemed to have fixed things for you! I have fingers crossed that none of your issues come back.

[Domo]

Still no codes or faults, thanks everyone for the help