Issues with HVAC Fan & Sunroof after Battery replacement

[KidsV70]

Hey folks,

So with all the stay home orders, the Volvo hasn't gotten much exercise, and the battery started to run down. So I had been putting a charger on it to bring it up. Until the last time, it overheated and boiled the electrolyte. Not sure how that happened since the charger is supposed to cut off, but the battery was old and sulfated.

So I went out and got a new battery and my daughter and I put it in. We did the proper reconnect procedure (ignition in Pos 2), but two things went wrong- the sunroof no longer works (UEM-0005) and the HVAC fan no longer works. There's no DTC for that showing in VIDA. The car does have a siren communication fault code (UEM-0004, I think) and a code related to a bad air quality sensor, but both of those codes predate this issue. I've already tried to just clear codes with VIDA to no avail.

Ideas?

Thanks!
Bert

[jonesg]

Hey folks,

So with all the stay home orders, the Volvo hasn't gotten much exercise, and the battery started to run down. So I had been putting a charger on it to bring it up. Until the last time, it overheated and boiled the electrolyte. Not sure how that happened since the charger is supposed to cut off, but the battery was old and sulfated.

So I went out and got a new battery and my daughter and I put it in. We did the proper reconnect procedure (ignition in Pos 2), but two things went wrong- the sunroof no longer works (UEM-0005) and the HVAC fan no longer works. There's no DTC for that showing in VIDA. The car does have a siren communication fault code (UEM-0004, I think) and a code related to a bad air quality sensor, but both of those codes predate this issue. I've already tried to just clear codes with VIDA to no avail.

Ideas?

Thanks!
Bert

I'd check the sunroof fuse, then the nicad battery in the alarm module on the passenger inner fender.

[oragex]

For the sunroof, the easiest is to remove the alarm siren fuse www.youtube.com/watch?v=nzlj6gX0I4k
For the cabin blower, it might be different. When connecting the battery, did you got all green lights on at the blower knob? That should have put the blower to the max. Try rotating the knob with the side of your finger a few times back and forth. Otherwise maybe the blower resistor has failed (if the thermistor went bad it usually wouldn't not affect the blower function)

[KidsV70]

For the sunroof, the easiest is to remove the alarm siren fuse www.youtube.com/watch?v=nzlj6gX0I4k

Makes sense. An 18-year-old car doesn't have much need for an alarm siren. Unless it's got a prancing horse on the hood!

For the cabin blower, it might be different. When connecting the battery, did you got all green lights on at the blower knob? That should have put the blower to the max. Try rotating the knob with the side of your finger a few times back and forth. Otherwise maybe the blower resistor has failed (if the thermistor went bad it usually wouldn't not affect the blower function)

It's strange- the lights come on at the blower knob, I can hear the doors moving in the heater box, the AC light comes on, but no fan. I did try every mode I could think of to see if there was a specific issue with the CCM controlling the fan but no result- tried in automatic, manual mode, and in defrost as well since its operation is independent of the other CCM settings. Another fuse, perhaps?

Thanks!!

[oragex]

Possible, heck the blower fuse http://www.volvohowto.com/volvo-s60-fus ... -amperage/

[jimmy57]

the pos 2 connect battery is an airbag service injury prevention step. If you have an airbag system fault you might have made a bad repair and hooking up the battery cable with the key on would blow airbags while you are back at battery out of harm's way. NO OTHER REASON TO DO THIS. The problem is that fumbling the ground cable while attaching it with ignition on can make modules have a WTF moment. To cure that you turn off ignition, wait 5 minutes, disconnect ground cable. Touch the removed ground cable to the positive cable terminal. The pos cable can remain connected. Hold the ground to the positive for at least 5 seconds to discharge capacitors in modules. The modules will not do a full reset unless this is done due to capacitor stored charge. Now connect ground with ignition off. Now go turn on ignition and start the engine and see if things work.
The newest Volvos have you connect battery, sit in center back seat and reach forward and twist the ignition knob for over a second to turn on ignition. This is the out of harm's way airbag injury avoidance.

[KidsV70]

Yup. Thanks, jimmy. It's worth a shot. The fuses were fine, though pulling the siren fuse did fix the sunroof, so that's one item out of the way.

Bert

the pos 2 connect battery is an airbag service injury prevention step. If you have an airbag system fault you might have made a bad repair and hooking up the battery cable with the key on would blow airbags while you are back at battery out of harm's way. NO OTHER REASON TO DO THIS. The problem is that fumbling the ground cable while attaching it with ignition on can make modules have a WTF moment. To cure that you turn off ignition, wait 5 minutes, disconnect ground cable. Touch the removed ground cable to the positive cable terminal. The pos cable can remain connected. Hold the ground to the positive for at least 5 seconds to discharge capacitors in modules. The modules will not do a full reset unless this is done due to capacitor stored charge. Now connect ground with ignition off. Now go turn on ignition and start the engine and see if things work.
The newest Volvos have you connect battery, sit in center back seat and reach forward and twist the ignition knob for over a second to turn on ignition. This is the out of harm's way airbag injury avoidance.

[KidsV70]

Hey all,
Thanks for bearing with me; I've had a lot of other things in the way of getting back to the Volvo.

Okay, so I tried the "ground the positive" method and no change. Although instead of hooking the negative back up with the key off, I did it with the key at position 2, since that's the Volvo method. I've also checked the fuse and that's ok.

The AC compressor is turning, which based on my experience with other cars, means the car thinks the fan is working. Right?

So other thoughts? Blower resistor? There were no CCM-related codes last time I looked.

Thanks,
Bert

Yup. Thanks, jimmy. It's worth a shot. The fuses were fine, though pulling the siren fuse did fix the sunroof, so that's one item out of the way.

Bert

the pos 2 connect battery is an airbag service injury prevention step. If you have an airbag system fault you might have made a bad repair and hooking up the battery cable with the key on would blow airbags while you are back at battery out of harm's way. NO OTHER REASON TO DO THIS. The problem is that fumbling the ground cable while attaching it with ignition on can make modules have a WTF moment. To cure that you turn off ignition, wait 5 minutes, disconnect ground cable. Touch the removed ground cable to the positive cable terminal. The pos cable can remain connected. Hold the ground to the positive for at least 5 seconds to discharge capacitors in modules. The modules will not do a full reset unless this is done due to capacitor stored charge. Now connect ground with ignition off. Now go turn on ignition and start the engine and see if things work.
The newest Volvos have you connect battery, sit in center back seat and reach forward and twist the ignition knob for over a second to turn on ignition. This is the out of harm's way airbag injury avoidance.

[theturk]

I have the same issue! My HVAC fan is not responding to trun knob, even the green lights are coming up. Anyone came up with a solution?

[turbozed]

I have the same issue! My HVAC fan is not responding to trun knob, even the green lights are coming up. Anyone came up with a solution?

And mine! Everything seems fine but the fan is not turning. Is this either the resistor pack or is the fan its self broken?