PINPOINT TEST AK : DTCs B1113 AND B111B: Notes

Refer to Climate Controlled Seats, Climate Controlled Seats for schematic and connector information.

Normal Operation 

The seat cushion and backrest are equipped with a Thermo-Electric Device(TED) assembly that includes a seat blower (fan motor, serviced as an assembly with the TED). When the Dual Climate Controlled Seat Module(DCSM) detects an overcurrent and/or overtemperature in the output circuits to the TEDs, it disables the affected seat and sets the following DTCs:

• DTC B1113 (Passenger Thermo-Electric Device Control Overtemperature Fault) -- If the DCSMTED driver integrated circuit temperature exceeds 175 deg.C (347 deg.F), the DCSM will shut down the passenger seat system and set this DTC.
• DTC B111B (Passenger Thermo-Electric Driver Overcurrent Low) -- If DCSM outputs to the passenger seat backrest or cushion TED (circuit pins A, B, C or D at the DCSM connector) or any components within these circuit loops are shorted to ground or a TED resistance of less than 0.9 ohm is sensed, the DCSM will shut down the passenger seat system and set this DTC.

This pinpoint test is intended to diagnose the following: 

• Wiring, terminals or connectors
• TED assembly
• DCSM