Test O: The Heated Seat Is Inoperative - Passenger

PINPOINT TEST O: THE HEATED SEAT IS INOPERATIVE - PASSENGER

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Normal Operation
The driver and passenger heated seat modules share a common ignition feed and have a separate battery and ground source. The dual automatic temperature control (DATC) module includes the heated seat control buttons and indicators. The heated seat system will function when the DATC module is ON or OFF. When a heated seat control button on the DATC module is pressed with the ignition switch in RUN or START, a momentary ground signal is sent to the heated seat module. Upon receiving a signal, the heated seat module will decrease 1 setting (the sequence is HI, LO, OFF, HI, etc.). When the heated seat system is ON, the heated seat module then supplies power to the heating element circuit. The cushion element and backrest element are wired in series and powered by the same output. The heated seat module will remain on until the heated seat control button is pressed to cycle the heated seat module to the OFF state. 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 heated seat control button is once again pressed with the ignition switch in RUN.

Possible Causes
An inoperative heated seat can be caused by:
- open fuse.
- wiring, terminals or connectors.
- a faulted heated seat element.
- a faulted heated seat module.
- a faulted DATC module.