Test W

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

Test W1:

Test W1-W4:

Test W5-W7:

Test W8-W9:

Test W10-W12:

Test W13-W14:

Test W15-W16:

Test W17-W18:

Test W19-W20:

Test W21-W22:

Test 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 over-temp 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.