Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLINCOLN2007MKZ FWD V6-3.5L VIN TREPAIR AND DIAGNOSISBODY AND FRAMESEATSTESTING AND INSPECTIONPINPOINT TESTSTEST S: DTC B103B/B1111 - THERMOELECTRIC DRIVER OVERCURRENT LOW/DRIVER THERMOELECTRIC DEVICE CONTROL OVERTEMPERATURE FAULT
2007 Lincoln MKZ FWD V6-3.5L VIN T
Test S: DTC B103B/B1111 - Thermoelectric Driver Overcurrent Low/Driver Thermoelectric Device Control Overtemperature Fault
2007 Lincoln MKZ FWD V6-3.5L VIN TSECTION Test S: DTC B103B/B1111 - Thermoelectric Driver Overcurrent Low/Driver Thermoelectric Device Control Overtemperature Fault
PINPOINT TEST S: DTC B103B/B1111 -THERMOELECTRIC DRIVER OVERCURRENT LOW/DRIVER THERMOELECTRIC DEVICE CONTROL OVERTEMPERATURE FAULT
Normal Operation
Both the driver and front passenger climate controlled seats are independently controlled electronically by the dual climate controlled seat module (DCSM) mounted to the bottom of the passenger seat cushion. The climate controlled seat system only operates with the engine running, however, if using a scan tool to command the DCSM, diagnostic testing can be carried out with the ignition switch key ON engine OFF (KOEO). The system receives power from battery junction box (BJB) fuse 12 (30A) feeding battery voltage on circuit SBB12 (GN/RD) into DCSM C3305a pin F. The system also receives power from BJB fuse 11 (30A) feeding battery voltage on circuit SBB11 (BU/RD) into DCSM C3305a pin E. If power is disconnected from either pin E or F of DCSM C3305a with the power connection remaining on the other circuit, both seats will remain operational because the power feed circuits are connected internally in the DCSM. However, if a fault occurs setting a DTC specific to either climate controlled seat, only the affected seat will be disabled by the module and the other will remain operational.
Each driver and front passenger seat cushion is equipped with a thermo-electric device (TED) assembly that includes a seat blower (fan motor, serviced as an assembly with the TED). Similarly, each driver and front passenger seat backrest is also equipped with its own TED assembly with blower. Cabin air is drawn through the blower and distributed to each of the TED modules located in the seat cushion and backrest. The TEDs then heat or cool the air. The air is then directed into the foam pad and manifold where it is distributed along the surface of the cushion and backrest of the seat. Once the system is activated, the DCSM uses a set of flexible algorithms to control the heating/cooling modes and the blower speed dependant on the EATC seat switch settings.
Possible Causes
A TED driver overcurrent low or device control overtemperature fault can be caused by:
- wiring, terminals or connectors.
- a faulted TED assembly.
- a faulted DCSM.
S1:
S2-S3:
S4-S5:
S6-S7:
S8-S9:
Normal Operation
Both the driver and front passenger climate controlled seats are independently controlled electronically by the dual climate controlled seat module (DCSM) mounted to the bottom of the passenger seat cushion. The climate controlled seat system only operates with the engine running, however, if using a scan tool to command the DCSM, diagnostic testing can be carried out with the ignition switch key ON engine OFF (KOEO). The system receives power from battery junction box (BJB) fuse 12 (30A) feeding battery voltage on circuit SBB12 (GN/RD) into DCSM C3305a pin F. The system also receives power from BJB fuse 11 (30A) feeding battery voltage on circuit SBB11 (BU/RD) into DCSM C3305a pin E. If power is disconnected from either pin E or F of DCSM C3305a with the power connection remaining on the other circuit, both seats will remain operational because the power feed circuits are connected internally in the DCSM. However, if a fault occurs setting a DTC specific to either climate controlled seat, only the affected seat will be disabled by the module and the other will remain operational.
Each driver and front passenger seat cushion is equipped with a thermo-electric device (TED) assembly that includes a seat blower (fan motor, serviced as an assembly with the TED). Similarly, each driver and front passenger seat backrest is also equipped with its own TED assembly with blower. Cabin air is drawn through the blower and distributed to each of the TED modules located in the seat cushion and backrest. The TEDs then heat or cool the air. The air is then directed into the foam pad and manifold where it is distributed along the surface of the cushion and backrest of the seat. Once the system is activated, the DCSM uses a set of flexible algorithms to control the heating/cooling modes and the blower speed dependant on the EATC seat switch settings.
Possible Causes
A TED driver overcurrent low or device control overtemperature fault can be caused by:
- wiring, terminals or connectors.
- a faulted TED assembly.
- a faulted DCSM.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.