Tests AF: DTC B2730 - Back Over-Temp Detected (Driver)

PINPOINT TEST AF: DTC B2730 - BACK OVER-TEMP DETECTED (DRIVER)

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Normal Operation
Both the driver and front passenger climate controlled seats are independently controlled electronically by the climate controlled seat module (CCSM) 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 CCSM, 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 8 (40A) feeding battery voltage on circuit SBB08 (VT/RD) into CCSM C3265a pins E and F. If power is disconnected from either pin E or F of CCSM C3265a with the power connection remaining on the other circuit, both seats will remain operational because the power feed circuits are connected internally in the CCSM. 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 CCSM 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 driver seat backrest over-temp fault can be caused by:
- wiring, terminals or connectors.
- restricted backrest TED filter.
- crushed or restricted backrest foam pad.
- crushed or restricted climate controlled seat manifold.
- a faulted backrest TED assembly.
- a faulted CCSM.