V70: Electrical - Heated seats

Joe Harding · Oct 12th, 2017, 12:31

I am fairly sure when we had our series 3 V70 in April the heated seats worked. Now they don't. I have checked the fuses, both buttons light up in sequence, and Diagnostic software allows me to highlight the heated seat setting.
Is there some clever setting whereby they don't come on unless the outside temperature is at a certain point? Why do diagnostics not let me turn them on remotely?

All ideas welcomed.

Simon Jones · Oct 12th, 2017, 12:56

Not aware of any link to the external temperature. Mine were working fine this morning at 8 degrees C. Which fuse number have you checked?

Joe Harding · Oct 12th, 2017, 22:45

1 & 2 under the driver footwell. Both heated seats are not working which rather suggests a system fault rather than a fuse.

apersson850 · Oct 16th, 2017, 13:40

The only thing that's related to external temperature is that in some models, you can have the driver's side seat heating turn on automatically if it's below 8°C. But manually you can turn them on in the middle of the summer.

Joe Harding · Oct 17th, 2017, 20:52

Thank you for your replies. Unexpectedly I think I sorted it tonight. I plugged in Vida and performed a CCM calibration which seemed to clear the fault.

Here's hoping for a toasty warm backside tomorrow.

Clan · Oct 17th, 2017, 21:03

Quote:

Originally Posted by apersson850

The only thing that's related to external temperature is that in some models, you can have the driver's side seat heating turn on automatically if it's below 8°C. But manually you can turn them on in the middle of the summer.

The little control unit under the seat knows the ambient temperature , It hasn't been single figures ambient temperature yet this year ... They worked last winter - yes ?

apersson850 · Oct 18th, 2017, 09:59

In cars with network communication systems (read: all modern cars), every controller can know everything, if the designer wants it to.

But in this particular case that's not the issue, as you can manually turn on the seat heating regardless of the outdoors temperature.
They are thermostat controlled, so if it's +30°C inside the car, they may not heat. But the indicator light will go on.

Oct 12th, 2017, 12:31	#1
Joe Harding Premier Member Last Online: Today 06:13 Join Date: Oct 2010 Location: Bristol	Heated seats I am fairly sure when we had our series 3 V70 in April the heated seats worked. Now they don't. I have checked the fuses, both buttons light up in sequence, and Diagnostic software allows me to highlight the heated seat setting. Is there some clever setting whereby they don't come on unless the outside temperature is at a certain point? Why do diagnostics not let me turn them on remotely? All ideas welcomed. __________________ "The more people I meet the more I like my God."

Oct 12th, 2017, 12:56	#2
Simon Jones Premier Member Last Online: Jan 15th, 2022 11:23 Join Date: Feb 2009 Location: Salisbury (ish)	Not aware of any link to the external temperature. Mine were working fine this morning at 8 degrees C. Which fuse number have you checked? __________________ 2008 XC70 3.2 SE Lux with LPG conversion - current 2005 XC70 D5 SE Lux - sold 2004 XC70 D5 SE Lux - written off by another XC70 2001 V70 D5 - sold 2000 V70 Classic 2.4 - sold

Oct 12th, 2017, 22:45	#3
Joe Harding Premier Member Last Online: Today 06:13 Join Date: Oct 2010 Location: Bristol	1 & 2 under the driver footwell. Both heated seats are not working which rather suggests a system fault rather than a fuse. __________________ "The more people I meet the more I like my God."

Oct 17th, 2017, 20:52	#5
Joe Harding Premier Member Last Online: Today 06:13 Join Date: Oct 2010 Location: Bristol	Thank you for your replies. Unexpectedly I think I sorted it tonight. I plugged in Vida and performed a CCM calibration which seemed to clear the fault. Here's hoping for a toasty warm backside tomorrow. __________________ "The more people I meet the more I like my God."

Oct 16th, 2017, 13:40	#4
apersson850 Premier Member Last Online: Apr 17th, 2024 21:40 Join Date: Jul 2011 Location: Traryd View Photos By: apersson850	The only thing that's related to external temperature is that in some models, you can have the driver's side seat heating turn on automatically if it's below 8°C. But manually you can turn them on in the middle of the summer.

Oct 18th, 2017, 09:59	#7
apersson850 Premier Member Last Online: Apr 17th, 2024 21:40 Join Date: Jul 2011 Location: Traryd View Photos By: apersson850	In cars with network communication systems (read: all modern cars), every controller can know everything, if the designer wants it to. But in this particular case that's not the issue, as you can manually turn on the seat heating regardless of the outdoors temperature. They are thermostat controlled, so if it's +30°C inside the car, they may not heat. But the indicator light will go on.

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