Driver Heated Seat Switch

The heated seat switches are located on the outboard seat cushion side shield of the driver and passenger front seats.

Heated Seat Switch:

The momentary, bidirectional rocker-type heated seat switch provides a resistor-multiplexed signal to the Memory Heated Seat/Mirror Module (MHSMM) via a hard-wired MUX circuit. Each switch has a center neutral position and momentary Low and High positions so that both the driver and the front seat passenger can select a preferred level of seat heating. Each heated seat switch contains two Light-Emitting Diode (LED) indicator lamps, which indicate the selected mode of the seat heater (HI/LO). Each switch also contains a incandescent bulb, which provides dimmer controlled back lighting of the switch when the headlamps or park lamps are on.

The two LED indicator lamps and the incandescent bulb in each heated seat switch cannot be repaired or replaced. If the LED indicator lamps or back lighting bulb are faulty or damaged, the complete heated seat switch must be replaced.

The heated seat switches receive battery current through a fused ignition switch output (run) circuit when the ignition switch is in the On position. Depressing the heated seat switch rocker to its momentary High or Low position provides a hardwired resistance signal to the Memory Heated Seat/Mirror Module (MHSMM). This signal tells the module to energize the heated seat element of the selected seat and maintain the requested temperature setting. If the heated seat switch is depressed to a different position (LO or HI) than the currently selected state, the module will change states to support the new selection. If a heated seat switch is depressed a second time, the module interprets the second input as a request to turn the seat heater OFF".

The HI and LO LED indicator lamps in the heated seat switches receive battery current through a fused ignition switch output (run) circuit when the ignition switch is in the On position. The ground side of each indicator lamp is controlled by the memory heated seat/mirror module. One side of the incandescent back lighting bulb is connected to ground at all times. The other side of the incandescent bulb is connected to the fused panel lamps dimmer switch signal circuit. These bulbs are energized when the park lamps or headlamps are turned on, and their illumination intensity is controlled by the panel lamps dimmer switch.