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 will disable the affected seat and set the following DTCs:

• DTC B103B (Thermoelectric Driver Overcurrent Low) - If DCSM outputs to the driver seat backrest or cushion TED (circuit pin G, H, J or K 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 shuts down the driver seat system and sets this DTC.
• DTC B1111 (Driver Thermal Electric Device Control Overtemperature Fault) - If the DCSM TED driver integrated circuit temperature exceeds 175°C (347°F), the DCSM shuts down the driver seat system and sets this DTC.

This pinpoint test is intended to diagnose the following: 

• Wiring, terminals or connectors
• TED assembly
• DCSM