Cushion overtemp detected

[Majestic]

2013 SHO. Anyone ever get this code? I periodically check codes in Forscan and always have this code. The seat heaters work, marginally, but that has always been the case. Ideas? Winter is coming up fast and I'd love to see if I can get these to function better. I've checked filters and they look fine.

 

[Ta2dResqr]

NOTE: The presence of overtemperature faults (DTCs B2729, B2730, B272A and B272B) can be induced by incorrect operation of the climate controlled seat system after an initial heat setting has been attained. If a heat setting is repeatedly turned OFF and ON in an attempt to increase the seat temperature or repeatedly toggled between heat and cool modes, an overtemperature condition can result and the DTCs will be set.


If the temperature at one of the Thermo Electric Devices (TEDs) rises above 110°C (230°F) in the heat mode or 65°C (149°F) in the cool mode for more than 4 seconds, the DCSM will record an overtemperature DTC, remove voltage from the TEDs and go into recovery mode (blower only) for 30 seconds to cool down the TEDs . The same will occur if a temperature difference of 60°C (108°F) or greater is seen between the backrest and cushion TEDs on either front seat. The DCSM will continue to monitor the TEDs while in recovery mode. If the temperature of the TEDs does not drop to 105°C (221°F) in the heat mode or 60°C (140°F) in the cool mode after 30 seconds, the system will continue to cool the TEDs in recovery mode for up to 5 minutes. If the TEDs cool down at anytime after 30 seconds, but before 5 minutes (checked at 4-second intervals), the system will operate as normal. An overtemperature DTC will still be recorded even if the system recovers and is operating normally. Recovery mode is more likely to occur during extreme cabin temperatures with significant seat back sunload. If the system does not recover within 30 seconds in heat mode or within 5 minutes in cool mode, the DCSM will disable that seat (fault mode) and remain off until the ignition is cycled. Also, if the DCSM detects temperature differential fault twice during the same ignition cycle, it will shutdown. When a fault causes a shutdown, the climate controlled seat indicators will turn off for the affected seat and that seat will not be operational until the next key cycle.




The tests are all checking for shorts and opens electrically and visual checks.

 

[Majestic]

Interesting, and, thanks. The light on the screen never turns off and the seats continue to function. They just don't heat very well. They cool much better, though. Weird.

 

[Ta2dResqr]

Interesting, and, thanks. The light on the screen never turns off and the seats continue to function. They just don't heat very well. They cool much better, though. Weird.

Sounds like yours is overheating and operating in Recovery mode. It will apply heat, see the overheat and record the code, cool itself before 5 minutes is reached, and start applying heat again. Rinse and Repeat.

 

[Majestic]

Sounds like yours is overheating and operating in Recovery mode. It will apply heat, see the overheat and record the code, cool itself before 5 minutes is reached, and start applying heat again. Rinse and Repeat.

Any ideas on a fix?

 

[Ta2dResqr]

I would guess it is going to be a high resistance causing extra amperage and overheating or a short causing a shorter path and overheating. What is the code? That will narrow down the troubleshooting.

 

[jman1200]

A friend of mine who owned a 2010 Taurus SEL had the seat overheat and shorted to the point it burnt a hole all the way though his pants.
Have a scape plan prepared, just in case... and butt-monitor the temperature closely.

 

[Bluezone]

I would guess it is going to be a high resistance causing extra amperage and overheating or a short causing a shorter path and overheating. What is the code? That will narrow down the troubleshooting.

That would be the low resistance causing a high amperage draw. Right idea, just the wrong direction in resistance value.

 

[ridered74]

The heated seats in my 2011 and 2015 never seemed like they were all that great, I think that's just how they are. I had a 2005 cadillac sts that you would have to turn it off the highest setting within 10 minutes, the sho seats I can't even feel them on a cold day for at least 5 minutes and never once have they been so hot that I felt the need to turn them down.

 

[Ta2dResqr]

That would be the low resistance causing a high amperage draw. Right idea, just the wrong direction in resistance value.

I guess the way I was thinking it, the voltage is constant. If the resistance is increased, it would draw more amperage trying to achieve the desired heat level. Kind of like a motor with bearings going bad or dirt in the window track.

The short with the shorter path reducing resistance was the other thought process.