Fault State

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The climate control seat system will operate normally in the battery voltage range of 9-16 volts. If the system voltage falls outside of this voltage range, the module will shut down all outputs until the system returns to its normal operating voltage range. The system will also transition to the fault state per the conditions listed below, by shutting down all outputs for the seat in which the fault occurred.

High Temperature Fault State

During the heating or cooling modes, if the TED temperatures listed below are exceeded for more than 4 seconds, the system will enter the High Temperature Fault State. At which time the CCSM will set the TED voltage duty cycle to 0%, set the blower speed control to maximum voltage to blow ambient air over the TEDs, attempting to reduce the TED temperature below the listed maximums. The system will operate in this mode for 30 seconds. If the over temperature fault still exists after 30 seconds, the system will transition to the FAULT state for the remainder of the ignition cycle. If the over temperature fault clears, the system will then transition to the appropriate heat or cool soft-start mode. The following temperatures are based upon individual readings of either sensor:

Heat mode TED temperature exceeds 230°F (110°C).
Cool mode TED temperature exceeds 149°F (65°C).

Temperature Delta Fault

During the heating or cooling modes, if the CCSM detects a temperature difference between the seat cushion and seat back TED temperature sensors exceeding the delta temperature listed below for more than 4 seconds, the system will enter the Temperature Delta Fault state. At which time the CCSM will set the TED voltage duty cycle to 0%, set the blower speed control to maximum voltage to blow ambient air over the TEDs, attempting to reduce the delta temperature to less than 68°F. The system will operate in this mode for 30 seconds. If the delta temperature fault still exists after 30 seconds, the system will transition to the FAULT state and remain there until the ignition has been set to OFF.

Delta between the seat cushion and seat back temperature sensors is 104°F (40°C).
This fault state is disabled in the back only mode.