Hi Im new to this forum but could really use some information.

My 2007 C70 was jumpstarted incorrectly and it fried the modules.
So my question is, if I have a donor c70 same year, same engine, can I swap all the modules to make them work together?
Do i need the ABS module? Ignition switch? Transmission module?
Basically, exactly what do i need to swap to make it work in my car?

Thanks!!

 

before you assume the computers need to be replaced, did you check fuses and relays?

 

Hi mt6127, yes i checked all the fuses and relays. took it to a dealer and they said it was the modules. They were not more specific, in fact I had to get help from Volvo Corporate to get the dealer to give me that much info after keeping the car 6 months... but that's another story.

Do you think it will work to swap a combination of modules from one car to another?

Thank you!

 

does the car start? do you know what fault codes were presented? on some models, the computers are paired, meaning if you replace the box, there needs to be some programming done by VIDA DICE (which is the diagnostic tool the dealers have..). Is there another dealer near by? Something doesn't seem right with their response...

 

Car does not start or turn over. Scanner cannot get codes. that dealer was very strange. But at this point I would like to try to swap all the modules needed from a donor car to my car. All the "paired" modules. That should work, right? just not sure what i should swap: Module in airbox, module under passenger seat, ABS module? What about the ignition switch?

 

well I did see replacement ECUs on ebay for about $75... that would be a cheap way to start. If you can't pull codes, you may want to see if you have power going to the ECU. Note when this happened to my wife's Toyota, there was a fuse that protected the electronics. Replaced that and she was back in business. So I'm still wondering about the diagnosis and whether there was a relay or fuse damaged or a wire harness issue. My gut says the engineers at Volvo should have considered what would happen if somebody crossed the jumpers and added some protection. I'm still stuck on getting a second set of eyes on the car.

 

I actually have a donor car available with all the part i may need, but as you mentioned, the ECU are paired... but paired to what? What modules need to be together to work in a different car? I know it's not the actual engine because you can do and engine swap and keep the old ECUs.

 

well there's quite a few modules in a modern car - the ECU is pretty much controlling the fuel metering but does take input from the transmission's TCU and other modules to manage safety. The TCU takes input from the ABS controller as well. Starting a car requires the ignition switch and several sensors - pedal position, shifter position to be active etc so things like the CEM (central electronics module) can be in play. My thinking was that if you can't get the ODB2 scanner to communicate to the ECU, either the ECU is not getting power or the ECU is fried. Computers are pretty stout again voltage - more common failures are mechanical (like cracks in a solder joint). Relays can and do get fried by voltage/current and that's typically what can fail in a CEM. One thing to note, on some cars (not sure about yours) the fuse and relay boxes can be stacked - where some disassembly is required to access a component. Just not enough info here to offer any guidance other than find a shop who can do the diagnostics and report back what they did and what they found. Personally I would not accept a service advisor saying "you have bad modules" without saying which and what observations they saw with a recommendation for next steps. Then again, I'm also the guy who has told a service advisor to go back and get the print out for my wheel alignment :-) (just so I knew they did the work).

 

thank you

 

have changed out used modules before and have never experienced a problem with it. I hope you didn't fry to many modules; there's like over 20 of them on the car. good luck!

 

really depends on what year car and what module you are swapping out. On my 2000 S40 I had to swap out the CEM - no problem, plug and play but on newer cars, there may be some dealer programing required with a replacement part (such as with replacing an ETM which is why people have their units rebuilt vs replaced). It would be nice to know which replacement models require a software reload vs which can be installed already used. Which year car /modules have you worked with? (lol, never had the opportunity to work on a Volvo newer than a 2000...)