Test G: Seat Does Not Heat But the Heated Seat Indicator Illuminates When Pressed

PINPOINT TEST G: SEAT DOES NOT HEAT BUT THE HEATED SEAT INDICATOR ILLUMINATES WHEN PRESSED

G1:

G1-G2:

G3-G4:

G5:

Normal Operation
The driver and passenger heated seats share a common ignition feed via the heated seat relay. The heated seat relay is energized when the ignition is ON. A shared ground source supplies the heated seat control switches and the heated seat elements. The heated seat control switches are a latching-type switch; continuity through the switch will remain, regardless if voltage is supplied to the switch or not, until the switch is pressed to place it in the OFF setting. When the heated seat control switch is pressed with the ignition switch in RUN or START, voltage is supplied to the bi-metallic thermostat that is part of the seat cushion element. The seat cushion element and seat backrest element are wired in series and powered by the same output of the bi-metallic thermostat that is part of the seat cushion element. The cushion element and seat backrest element are wired in series and powered by the same output. The heated seat will remain on until the heated seat control switch is pressed and voltage is no longer supplied to the bi-metallic thermostat. If the ignition source is removed from the heated seat, the heated seat system will return to ON with the ignition switch in the RUN state until the switch is pressed. The heated seat system is designed to maintain the temperature by the opening (no voltage to the heated seat elements) and closing (voltage supplied to the heated seat elements) of the bi-metallic thermostat.

Possible Causes
An inoperative heated seat can be caused by:
- circuit 1067 (VT/LB) open or short to ground.
- circuit 57 (BK) open.
- backrest heated seat element.
- cushion heated seat element.