Heating Characteristics

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: The presence of overtemp faults (DTCs B2729, B2730 and B2731) 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, an overtemp condition can result and the DTC(s) will be set.

The climate controlled seat system draws approximately 7.5 amps until reaching the set point, and then the system draws approximately 2 amps to maintain the climate setting.
In HEAT mode, the TED can add up to 40-60°C (72-108°F) to the ambient air temperature entering the system.
There are 3 manual settings based on the position of the climate controlled seat switch on the DATC module. Position 1 is the LOW setting and position 3 is the HIGH setting.
There are 5 AUTO HEAT settings. The AUTO HEAT setting is determined by the temperature setting of the DATC module when the CCSM is in AUTO HEAT mode.
In the LOW setting, the climate controlled seat module is set to maintain TED temperature at 37°C (99°F).
In the HIGH setting, the climate controlled seat module is set to maintain TED temperature at 65°C (149°F).
If the temperature at 1 of the TEDs rises above 85°C (185°F) in the HEAT mode or 70°C (149°F) in the COOL mode for more than 4 seconds, the CCSM will record an overtemp DTC, remove power from the TEDs and go into BLOWER ONLY mode in an attempt to cool down the TEDs. If the TEDs temperature has not dropped to 80°C (176°F) in the HEAT mode or 65°C (140°F) in the COOL mode after 30 seconds, the CCSM will shut down and remain off until the ignition is cycled. Also if the CCSM detects an overtemp twice during the same ignition cycle, it will also shut down.
In HEAT mode, there is no linear correlation between the (DATC) module, the seat fan motor speed and the TED supply voltage. The CCSM will independently vary the fan speed and the TED supply voltage in order to reach and maintain the temperature determined by the (DATC) module setting.