Test V

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

Test V1-V2:

Test V3-V5:

Test V6-V8:

Test V9-V10:

Test V11-V12:

Test V13-V14:

Test V15-V16:

Test V17-V18:

Test V19-V20:

Test V21-V22:

Test V23-V24:

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-HC23 (WH/BK) (seat cushion TED) and circuit 8-HC16 (WH/RD) (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.