Seat Heaters

Operation of the seat heaters is controlled by the ATC module on receipt of a heating request from either of the seat heater momentary switches located on the control panel. The switches are mounted in the LH and RH rotary controllers. A single press of a seat heater switch will implement low level heating and illuminate a tell-tale LED. A second press of the switch will implement high level heating and illuminate 2 tell-tale LED's. A third press of the switch will turn the seat heater off.

Seat heating requests are transmitted from the ATC module to the seat heater control modules on the LIN bus. Two seat heater control modules are fitted, one under each front seat. The seat heater control modules provide an electrical supply to the seat heater elements and a temperature sensor located in the seat cushion.

The seat heater control module provides a 5 V reference feed to the seat heater temperature sensor. The seat heater temperature sensor is an NTC thermistor. By monitoring the returned voltage, the control module can calculate the temperature of the seat. If the temperature rises above the target temperature, the control module will disable operation of the heater elements.