Hi all,
2004 V70, 2.4, NA, 5sp
I was sitting with key accessory on listening to radio. Low battery warning pops up (time for a new battery or check liquid level).
I started car and it idled for 10+ minutes. Steady rain around 3C.
Smelled a nasty acrid burning smell, didn’t notice the DIM (instrument cluster) had no lights right away.
Drove off, no DIM lights at all and climate lighting and function also not working. Everything else worked.
Checked it the next day and got the following codes;
DDM0030, DDM0024, DDM002B, PDM0024, PDM002B, CEM8F43,
these pop up every once in a while if I check for codes but never trip the check engine light.

The following codes are new and never seen before;
CEM6C48, CEM3A04, CEM6A03, CEM6A01, CEM 1A54, CEM1A55, CEM1A56

Fuse #24 was gone, replaced it and popped as soon as I turned the key.

I started the car with #24 not in place, while still running I installed the fuse. DIM and climate system lights and operation come to life. Everything works.

I could move the drivers back (access to CEM) only if I locked the car then unlocked with the FOB then used the seat controls. Switching to accessory, the seat wouldn’t move.

I started and stopped twice more (did VIDA CEM reset?, turn ignition off, start and rev above 1500rpm, turn off, start and idle for 20sec)

I got a warning light in red; “SRS airbag service urgent” I cleared all codes and checked with my PPC Diagnostic reader and no codes came up.

I was just going to pull the DIM and see if I can see what caused that burning smell, something fried.

Any insight is welcome. It’s really cold right now so running without the climate system is a non-starter.

thanks

Here is the link to Matthews about this issue. Far smarter fixers than I.
https://www.matthewsvolvosite.com/forums/viewtopic.php?t=99451

I can't help too much on the fuse #24 stuff, but I would certainly deal with the battery/charging issue before pursuing the rest of the troubleshooting. These P2 cars are super sensitive to voltage issues, with weird symptoms that can leave you chasing your tail.

I'd start with having the battery load tested, then check out the charging system and then take things from there. It occurs to me that Xemodex.com has some straightforward diagnostics for CEM function involving resistance measurements on their website.

I think the 2004's had issues with water leakage onto the CEMs. Matthew's Volvo site has some pretty sharp diagnostics guys. Might be worth posting there too!

Hi Herb,
Charging is good(14.1VDC at idle), it's just the typical 5 year battery life (this one is on 6yrs) killed by the cold I'd guess.
thanks

Hi,

I don’t know anything about these cars but you said you were sitting in a steady rain and operating the car.
You probably haven’t done that very often unless you relax that way as these vehicles have comfortable seats!
That has to be a big clue as the whole affair is not normal for now an aging car.

You might have water leaking in around the windshield or while you were running the wipers, water came in on one of the wiper arms shafts! A somewhat common issue of aging for the 240’s rubber grommets.

You see why I want to go with a wiper arm leakages.
Since I was crossed with reading about those being programmed on Volvos, that makes it scary for me!
I suggest you look there an any place above the computers.
Follow the wiring from any possible entry point and look for spots with no dust laying about!
Check any harness connectors. The smell probably came from one of those and should have discoloration stains.

Sure seems like a whole lot of codes for one memory bank. That technology sure has changed since the early nineties 240 cars that I have!

I have no idea what all of those are but it appears it hasn’t been cleared in a long time and you had a smorgasbord of them to digest!

A check engine light was originally designed for the purposes of emission errors indications.
You can lots of things wrong with these newest cars that never trips for the engine light.

These systems are like a woven reed basket, that can look intact with strands running everywhere, but the strength of basket depends on all the strands being routed correctly.
Water can play havoc with these low voltage and current sensing circuits. With them coming on at the same time when they shouldn’t and overheats neighboring wires to a ground circuit.
The dimming cluster lights says power was being diverted.

Good luck looking for signs of a gremlin’s trails!

Phil

If you want scary look at any newer car. 2004 is bad enough. Everything today is a laptop of wheels.
Great ideas will check out your suggestions.
cheers