Dead Instrument Cluster, HVAC and Power Seats

Snakebite · Post by **Snakebite** » 08 Nov 2020, 19:31

I have a 2004 S60 2.5T automatic 2 wheel drive.
All at once the instrument cluster, all HVAC controls, and power seats died. This happened after a jump start.

The fuses are all good and I suspect it is the computer.

Has anyone run across this?

I pulled the instrument cluster and looked at the solder. Nothing looks hot or cracked so I don't think it's the common issue with that.
All lights for the heat controls are out.
The power seats are not working.

Car runs fine and not in limp mode.
Blinkers and headlights work. Radio works.

Thanks in advance.

Snakebite · Post by **Snakebite** » 18 Nov 2020, 15:45

Thanks for all the help everyone!

Anyhoo...took the car to the dealer and they said there is a direct short in the CEM.
Just to be helpful to others that search this site I will let you know how the repair goes.
The stealership wants $1630 to replace and reprogram the CEM.
I will be sending it out to XeMODeX where they copy the program and install it on a new CEM for under $700, shipping included.
Looks like I will be getting a VIDA Dice program in the future. Dealer charged $330 for diagnostic.

Post by **abscate** » 18 Nov 2020, 15:59

If you have the part yagger can reprogram your CEM here. That’s a good price from Xmodex for part and programming, though.

Snakebite · Post by **Snakebite** » 25 Nov 2020, 22:55

Update:
Picked up the car from the dealer and paid the $330-10%.
Got in the car and BOOM! All gauges, heater controls, and power seats work. The odometer and clock went all Matrix on me for a minute, but it all works.
No reflash or replacement parts installed.

Now I am second guessing what to do.
Replace CEM? Rebuild gauge cluster? Do nothing and wait for something to fail again?

More to come for sure.

Post by **abscate** » 26 Nov 2020, 04:03

Just run it. I bet it was caused by the loss of voltage from your jump incident and was never a hard failure

Post by **firstv70volvo** » 26 Nov 2020, 09:21

Snakebite wrote: ↑25 Nov 2020, 22:55 Update:
Picked up the car from the dealer and paid the $330-10%.
Got in the car and BOOM! All gauges, heater controls, and power seats work. The odometer and clock went all Matrix on me for a minute, but it all works.
No reflash or replacement parts installed.

Now I am second guessing what to do.
Replace CEM? Rebuild gauge cluster? Do nothing and wait for something to fail again?

More to come for sure.

According to the wiring diagram (2002) I have there is a common power source to all the modules you are having problems with, it's fuse 11C/24. Power seats module, Climate control module, Combined instrument panel and Control module. If you see this problem again I would measure the voltage level at this fuse and better yet at one of the modules in question. Either there's a intermittent power supply problem to the modules or one of the modules or wiring could be pulling down the voltage level due to a partial short or latch-up type condition. In any case measuring the voltage at this common point will provide a clue as to what's going on if you see this problem again. If it were my car I would at least just replace the 10A fuse and make sure the fuse contacts and clean and in good condition. Do you know if the dealer disconnected the battery or reseated the 11C/24 fuse?

Edit: The 11C/24 power is the extended D1 supply and controlled by the CEM through relay 2/29, location CMI22 on the CEM. I think this is the power that continues on for a few minutes after the ignition key is removed. If the CEM wasn't controlling the 2/29 relay correctly or there's a problem with this relay then all the modules you're having problems with would not be getting this power supply.

Snakebite · Post by **Snakebite** » 11 Dec 2020, 11:26

Thanks for the detailed reply.
The dealer told me that the fuse was removed which doesn't make sense. The fuse didn't just jump out.

So far so good. This is my son's car and he hasn't informed me of any issues since getting it back...other than the gas gauge is always on E! then he asks for $20 to fix that problem...Kids!

djgipp · Post by **djgipp** » 23 Nov 2022, 20:19

Came here to say THANKS. Had this same issue:

Dead instrument cluster
Dead climate controls
Dead driver power seat only... passenger seat controls were fine).

The 10A fuse #24 was fine and not blown. Replaced relay 2/29 CMI22... and everything came back to life.

CMI22 is under the driver side kick panel, so remove the lower panel, reach way up there and imagine the layout in order to pull and replace the third from top right side relay.

It was a $24 fix this time. Previously we had the "blower stuck on high" issue due to a spilled drink that sloshed into the small climate vent above the cupholder... the temperature sensing resistor is right behind that mini-vent I think. So we let it dry out over a hot summer. Everything worked for awhile, then we lost the cluster, climate and driver seat controls.

There *might* be other problems back there. SOMETHING made the relay fail. Maybe it was a cascade of that climate vent spill.

Anyways, it's all good for now and the 5 Speed MANUAL 2001 V70 T5 is back on the road. yay.

Adamastor · Post by **Adamastor** » 21 Sep 2025, 13:45

I had this problem recently on my S80, but after changing relay 2/29 all got normal (the trunk opening relay is the same).
After about two weeks of normal operation, today I happened again: dash completely dead, no climate control or eletric seats.

((

Could I have been very unlucky to have another relay fault or is it another problem that is getting these relays bad?

Anyone who replaced this relay never had this problem again?

Thanks in advance!

firstv70volvo wrote: ↑26 Nov 2020, 09:21
Snakebite wrote: ↑25 Nov 2020, 22:55 Update:
Picked up the car from the dealer and paid the $330-10%.
Got in the car and BOOM! All gauges, heater controls, and power seats work. The odometer and clock went all Matrix on me for a minute, but it all works.
No reflash or replacement parts installed.

Now I am second guessing what to do.
Replace CEM? Rebuild gauge cluster? Do nothing and wait for something to fail again?

More to come for sure.
According to the wiring diagram (2002) I have there is a common power source to all the modules you are having problems with, it's fuse 11C/24. Power seats module, Climate control module, Combined instrument panel and Control module. If you see this problem again I would measure the voltage level at this fuse and better yet at one of the modules in question. Either there's a intermittent power supply problem to the modules or one of the modules or wiring could be pulling down the voltage level due to a partial short or latch-up type condition. In any case measuring the voltage at this common point will provide a clue as to what's going on if you see this problem again. If it were my car I would at least just replace the 10A fuse and make sure the fuse contacts and clean and in good condition. Do you know if the dealer disconnected the battery or reseated the 11C/24 fuse?

Edit: The 11C/24 power is the extended D1 supply and controlled by the CEM through relay 2/29, location CMI22 on the CEM. I think this is the power that continues on for a few minutes after the ignition key is removed. If the CEM wasn't controlling the 2/29 relay correctly or there's a problem with this relay then all the modules you're having problems with would not be getting this power supply.

Post by **DavidE7** » 26 Sep 2025, 20:05

There are a bunch of the same relay in the CEM and rear module. Find one on the wiring diagram that controls a less important function and swap it. The relays are designed and rated for a certain number of switching cycles - most will last almost forever but ones with lots of current flow or high switching loads will start to have problems when they get old. Then grab a handful of Volvo relays and fuses at a pick-n-pull junkyard so you are ready for any electronic gremlin inside the fuse and relay boxes.