Heated Seat Module - Operation

OPERATION

The Heated Seat Module (HSM) controls the heated seat system, vented seat system and the heated steering wheel, depending on how equipped. The HSM is secured to a mounting bracket located under the front passenger seat. The HSM responds to heated and vented seat and heated steering wheel switch messages and ignition status inputs by controlling the 12 volt Direct Current (DC) output to the seat and steering wheel heating elements and front vented seat motors through integral solid-state relays.

When either of the front heated seat switches in the U-Connect Touch(TM) screen module are pressed, the module sends a message over the Controller Area Network (CAN) data bus to the HSM, signaling the HSM to energize the heating elements for the selected front seat. When equipped with rear heated seats, a request signal is sent to the HSM over a hard-wired circuit from the rear heated seat switch, to signal the HSM to supply power to the selected rear seat heating elements.

When either of the front vented seat switches in the U-Connect Touch(TM) screen module are pressed, the module sends a message over the CAN data bus to the HSM, signaling the HSM to operate the vented seat motors for the selected front seat.

When the heated steering wheel switch in the U-Connect Touch(TM) screen module is pressed, the module sends a message over the CAN data bus to the HSM, signaling the HSM to energize the heating element for the steering wheel.

The HSM energizes the integral solid-state relays that supply battery current to the heating elements. Heated seats turn off after 45 minutes of continuous operation. If high-level heating is selected, the control system will remain at the high level for 20 minutes and then drop to the low level. Normal heating cycle for the heated steering wheel is a minimum of 52 minutes.

The heated and vented seat and heated steering wheel system only operate when the ignition is in the Run position, and will turn off automatically whenever the ignition is set to any position other than Run.

The HSM is diagnosed using a scan tool Testing and Inspection. The HSM will automatically turn off the heating seat and steering wheel elements if it detects an open or low short in a heating element circuit. The HSM will automatically turn off the vented seat motors if it detects an open or low short in a vented seat motor circuit.