Seat Temperature Control Module: Description and Operation
SWITCH/MODULE-HEATED SEATDESCRIPTION
Momentary contact push button switch/modules mounted in the front face of the center console storage bin operate the heated seat system. Each heated seat switch/module has two Light-Emitting Diode (LED) indicator lamps, which indicate the selected level (Low or High) of the seat heater. Pressing the switch/module button initiates heat. Heat remains on until switched off or until the ignition is turned off. If switched off by the ignition, a switch/module button must be pressed to restart heating.
The switch/modules contain the solid state electronic control and diagnostic logic circuitry for the heated seat system. If any of the heated seat elements are inoperative or damaged one or more of the LED lamps in the switch/module for the effected seat will flash.
The LED indicator lamps in each heated seat switch/ module cannot be repaired. If the LED lamps are faulty or damaged, or the switch/module is inoperative or damaged the individual heated seat switch/module assembly must be replaced.
OPERATION
A Heated Seat Switch/Module is used to control the heated seat system. The heated seat switch/modules receive battery current through a fused ignition switch output (run) circuit when the ignition switch is in the On position. The switch/module responds to heated seat switch/module button input and ignition switch status inputs by controlling the 12v output to the front seat heating elements through integral solid-state relays.
When either of the heated seat switch/module buttons are depressed the heating element for the selected seat is energized. Amber Light Emitting Diodes (LEDS) on the side of each switch/module indicate the level of heat in use: Two LEDs are illuminated for high, one for low, and none for off. Pressing the switch/module button once will select high-level heating. Pressing the button a second time will select low-level heating. Pressing the button a third time will shut the heating elements off.
The heated seat switch/module energizes an integral solid-state relay, which supplies battery current to the heating elements. When high-temperature heating is selected, the heaters provide a boosted heat level during the first four minutes of operation after heating is activated. The heat output then drops to the normal high-temperature level. If high-level heating is selected, the control system will automatically switch to the low level after two hours of continuous operation. At that time, the number of illuminated LEDs changes from two to one, indicating the change. Operation on the low setting will continue indefinitely until the switch/module button is pushed to turn the system off.