Heating Characteristics

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: The presence of over-temp faults (DTCs B2729 and B2730) 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 over-temp 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 three manual settings based on the position of the climate controlled seat switch on the DATC module. Position one is the LOW setting and position three is the HIGH setting.
There are five 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 one 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 four 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.
Cooling Characteristics
The climate controlled seat system draws approximately seven amps until reaching the set point, and then the system draws approximately two amps to maintain the temperature setting.
In the COOL mode, the TED can remove up to 8-10°C (14-18°F) from the ambient air temperature entering the system.
There are three manual settings based on the position of the climate controlled seat switch on the DATC module. Position one is the LOW setting and position three is the HIGH setting.
If the temperature at one of the TEDs falls below 18°C (64 °F), the climate controlled seat module will shut down the TEDs. If the temperature continues to drop below 12°C (54°F), the climate controlled seat module will shut down the fan motor.
In COOL mode, there is a correlation between the DATC module, the seat fan motor speed and the TED supply voltage. Fan supply voltage is used in the following equation (seat fan motor supply voltage/0.74 x ignition voltage) to determine the fan duty cycle. For additional information, refer to the following chart.

COOLING CHARACTERISTICS

Climate Controlled Seat Switch Setting ⁽¹⁾

Seat Fan Motor Supply Voltage

Thermo- Electric Device Supply Duty Cycle

Off

Manual 1 or Auto 1

8.7 volts

Auto Mode

2 9 volts

32%

Manual 2 or Auto 3

9.1 volts

45%

Auto Mode

4 9.1 volts

45%

Manual 3 or Auto 5

9.5 volts

100%

⁽¹⁾	Auto settings are determined by the temperature settings of the DATC module and cannot be manually selected.

The climate controlled seat system is deactivated by one of the following actions:

Setting the DATC module setting to manual OFF.
Turning the vehicle off.