Vented Seat Operation
The passenger seat block diagram is identical to the driver seat.
| Callout | Component Name |
|---|---|
| A20 | A20 Radio/HVAC Controls |
| K40 | K40 Seat Memory Control Module |
| M73C | M73C Seat Blower Motor - Driver Cushion |
| M73A | M73A Seat Blower Motor - Driver Back |
| M73D | M73D Seat Blower Motor - Passenger Cushion |
| M73B | M73B Seat Blower Motor - Passenger Back |
Each vented seat consists of 2 blower motors blower motors; one in the seat back and one in the seat cushion. During vented seat operation, the vented seat blower motors move cabin air through channels in the foam pad and small holes in the seat covers causing a cooling effect to the occupant.
The driver and passenger vented seats are controlled by separate vented seat switches located in the HVAC controls. With the ignition ON, battery voltage is supplied to the driver and passenger seat blower motors through a 10A fuse located in the underhood fuse block.
When a vented seat switch is pressed, a serial data message is sent from the HVAC controls to the HVAC control module indicating the vented seat command. The HVAC control module serves as a gateway to transmit the message to the seat memory control module/seat heating control module via the serial data line. In response to this message, the seat memory control module/seat heating control module applies a low side pulse width modulation (PWM) signal through the blower motor control circuits to the seat cushion and seat back blower motors indicating the vented seat command. The logic in the blower motors then sets the blower speed to the switch set point. The blower motors run causing a cooling effect to the occupant. The seat memory control module/seat heating control module then sends a serial data message back to the HVAC control module to gateway the information back to the HVAC controls to either illuminate or turn off the appropriate switch indicator.