Test F: The Heated Seat Is Inoperative

PINPOINT TEST F: THE HEATED SEAT IS INOPERATIVE

F1-F2:

F2-F4:

F4-F5:

F6-F8:

F8-F9:

F10-F11:

F12-F13:

Normal Operation
The driver and passenger heated seats share a common battery and ignition feed. A shared ground source supplies the heated seat control switches. When the heated seat control switch is pressed with the key in ON or START, a momentary ground signal is sent to the heated seat module. The heated seat module then supplies voltage to the heating grid circuit. The cushion grid and seat backrest grid are wired in series and voltage is supplied by the same output. The heated seat module also supplies voltage to the separate indicator circuit for the indicator to illuminate (located in the heated seat switch) to indicate an ON state. The heated seat module will remain on until the heated seat control switch is pressed and a momentary ground signal is received, or until 10 minutes expire. If the ignition source is removed from the module, the heated seat module will enter an OFF state and will not return to ON until the switch is once again pressed with the ignition switch in RUN. The heated seat module is designed to heat the seat to 37.5°C (99.5°F) and maintain the temperature until time-out or until switched off. This temperature is maintained by the heated seat module monitoring the temperature sensor, located in the seat cushion grid and duty cycling the current flow to the heating grids.

Possible Causes
- circuit 57 (BK) open
- circuit 581 (RD) open or short to ground
- circuit 1003 (GY/YE) open
- circuit 1060 (BK/LB) open or short to ground
- circuit 1061 (BN/LB) open or short to ground
- circuit 1064 (YE/LB) open
- circuit 1067 (VT/LB) open
- circuit 1153 (RD/BK) open
- heated seat switch(es)
- heated seat module(s)
- heated seat grid(s)
- heated seat temperature sensor(s)