Test K

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

Test K1:

Test K1-K4:

Test K5-K8:

Test K8-K9:

Test K10-K12:

Test K13-K14:

Test K15-K17:

Test K17-K18:

Test K19-K21:

Test K21-K22:

Test K23-K24:

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 1548 (DG/LG) (seat cushion TED) and circuit 1549 (DB/OG) (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.
- airflow leaks.
- collapsed airflow channels in the seat cushion foam.
- incorrect installation of a TED.
- TED.
- CCSM.