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I've driven 5000km since the swap, and it's been absolutely flawless it's truly a joy to drive. I decided to swap every last module, my worry was one of the other modules was shot, and causing the modules on the high speed can bus to work overtime and eventually fail themselves. I feared if I only s...

FUCK YEAHHHHHH!!!!!!!!!!

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She's alive.

Updates to follow with some pics and advice, but for now: SUCCESS!!!
Cheers all, time for a beers

Here goes nothing... I pulled the CEM, TCM, ECM, ABS, ETM, DDM, PDM, PSM, ISM, SWM, UEM, REM, SRS, DIM, and CCM from my donor s80, - Volvo2.jpg - Along with the seats as the psm is there and my driver's sips was an error that wouldn't clear in vida. Volvo1.jpg - These are going in my car tonight, wi...

Damn, the ETM has to go with the rest eh? Normally i'd be all over it- no question about swapping every last module HI and LO, but..... its mid december in Canada! volvos.jpg - I got the donor car home, I'll start pulling modules shortly. As much as I don't want to swap every single module on accoun...

I've found a MY2000 s80 t6 that I am going to drag home today and start swapping modules between the two cars. I'll be swaping everything on the HI speed loop CEM TCM ECM ABS and ETM if required. Can anyone offer any insight into what modules are VIN locked and will also need to make the journey fro...

Haha thanks... I found a 2000 I may pick up and swap some parts

I received an email back from xemodex this morning: I can certainly understand why you were suspecting the CEM. Issues on both the high speed and low speed. The clock issue is a little worrying. That would usually indicate a CEM problem, but I'm surprised we didn't see anything wrong with it. How of...

Haha, yes that makes sense, I'm so used to BRAKE FAIL meaning my volvo is going to run shift and drive like crap, not that BRAKE FAIL would have anything to actually do with the brakes... I ran the car a few times with the ABS unplugged. The gauges all worked for a bit, then didn't. Restart typical ...

I'm interested in more info I'll send a PM.

In the meantime I disconnected the battery ground and shorted it to + and let it sit for half hour, unplugged ABS and reconnected the battery. The BRAKE FAIL message appeared right away, with the ABS unplugged.

To eliminate the ABS module, I'll disconnect the battery, disconnect the abs module, reconnect the battery and go for a drive!

What you're saying about the 4th wave makes sense.

Again, thank you for the replies

I'm not sure if it's at all related but the fuel gauge doesn't work 100%, the car is out of fuel at 1/4 left on the gauge, it suddenly goes for 1/4 to 0 and the car dies pretty much. Also the clock doesn't count up or down, I can set it to 1pm and it will remain at 1pm indefinitely.

If these guys couldn't touch it, who can I trust to test my CEM, ECM, TCM, ABS?

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I'm in Canada, xemodex is only a couple hours drive and I had read mostly good things on forums about them, but maybe I need a second opinon.

I sent my CEM and ECM to xemodex, they said they were both okay!

The 3rd waveform with the ETM & ABS disconnected is the only one that the ground reference isn't pulled out of whack, but the waveform is junk

I haven't plugged in vida in some time, figured why not. This is what won't clear, as of today.

Ok, I hooked my scope up to the high speed bus at the CEM and here are the results: This was all with the key on II. I turned the key off between plugging/unplugging, then turned the key back to II, and took a screenshot. Figured out how to use this scope a bit better and captured a longer time samp...

Is this with the engine OFF and the key ON? thanks!

There's no evidence of water on/in/near the cem, and everything looks good above it when viewed from the windshield wiper side of things. To eliminate the possibility of a bad splice or broken wire I re-wired the high speed canbus from the CEM to ABS and TCM using belden "blue hose" wire, which is a...

I found a 2005 s80 t6, mine is a 99. Does anybody know, electrically, what is different between a 99 and an 05?

With the battery disconnected, I have 62.1 ohms resistance on the HI speed bus, tapped in between the CEM and the TCM. When I unplug the ETM it goes to 120. Similar ~60ohm on the low speed loop, measured at the AUM plug. The splice point in the wiper loom eludes me, it must be inside the rubber boot...

Yes, i have. But can something like a DDM take down the high speed network that ECM works on?

I have taken apart, cleaned with electrical contact cleaner and a toothbrush, then liberally applied di electric grease to every connector I could find in the can loops and at each module. There is at least one I cannot easily get to (behind the dash) and I have not checked phsyical pin fit, no. I'v...

Ok so the

CEM
TCM
ECM
REM
UEM
SRS

Are vin locked,

But not

ABS
ETM
AUM
PDM
DDM
PSM
CCM

Is this correct? Could my key be programmed to work with the immobilizer, or am I swapping ignition module as well?

This may be my easiest option, believe it or not
Thanks

The problem manifested itself before the stereo was upgraded, so I don't think that's the issue. Looking at the canbus wiring diagram I would think the UEM and the REM have the end of line resistors. I'll disconnect the battery and check resistance next

I'm having a helluva time diagnosing electrical issues in 99 s80 t6,

Hypothetically, if I had a donor car, what modules are vin specific and need to stay as a set?

Thanks

Again, thank you for the replies, it's much appreciated! I will try disconnecting the alternator next, it has started pouring rain here so that's a tomorrow job. My only issue with the alternator being the cause is after the network has crashed, I can shut the car off (scope still shows corrupted ca...

Ok, car has been sitting overnight, it started fine but within seconds BRAKE FAIL appeared. I put the scope on the CANH side of the LO SPEED bus via the AUM plug, and the familiar corrupted waveform was shown. I swung channel A from the oscilloscope onto the positive battery post under the hood (whi...

I sourced a TP3939202 pdf, that's exactly what I needed, thank you. Looking at the drawings, I am currently on the lo speed bus when seeing this corruption. I'll swing the scope over to B+ this morning once it fails and see what the alternator is up to. If a lo speed module fails, say the DDM, can i...

Thanks for the feedback Rick, much appreciated. Currently I am tapped into the CanBus network at the AUM plug. My next step is to tap into the canbus as close to the CEM as possible and start unplugging modules from front to back while watching my oscilloscope at any hint of the network recovering. ...

If I probe the green and white wires (can high and low) at the cem, and unplug modules one at a time, will the network clear right away or will the cem latch onto a corrupt network and stay that way regardless of if the damaged module is still physically connected or not? Is the canbus network is ph...

Hello, anybody have any ideas? 99 s80 T6, BRAKE FAIL STOP ASAP message start appearing for no apparent reason, and with increased frequency. Sometimes its fine for hours, other times its as soon as I turn the key it fails. Shift solenoid goes nuts, gear selector light stays in P regardless of gear, ...