Test W: DTC B2729 - Cushion Over-Temp Detected/DTC B2730 - Back Over-Temp Detected/DTC B2731 - Differential Temperature Fault

PINPOINT TEST W: DTC B2729 - CUSHION OVER-TEMP DETECTED/DTC B2730 - BACK OVER-TEMP DETECTED/DTC B2731 - DIFFERENTIAL TEMPERATURE FAULT - PASSENGER SEAT

W1-W2:

W3-W5:

W6-W8:

W8-W9:

W10-W11:

W12-W14:

W14-W15:

W16-W17:

W18-W19:

W20-W21:

W22-W23:

W24:

Normal Operation
Each thermo-electric device (TED) contains an internal temperature sensor (thermistor) that is used by the climate controlled seat module (CCSM) to monitor the temperature of each (TED). Based on the temperature of a TED, the internal sensor resistance will vary the voltage on circuit 8-HC24 (WH/RD) (seat cushion TED) and circuit 8-HC19 (WH/BK) (backrest TED).

Possible Causes
An overtemp or differential temperature fault can be caused by:
- wiring, terminals or connectors.
- damaged, restricted or disconnected air ducts.
- worn, damaged or incorrectly installed foam wedge, cushion foam or seat cushion trim cover.
- a restricted seat fan motor filter.
- airflow leaks.
- collapsed airflow channels in the seat cushion foam.
- incorrect installation of a TED.
- TED.
- CCSM.