Pacifica V6-3.8L VIN L (2005)
Seat Heater Switch: Description and Operation
Heated Seat Switches - 2ND Row Seats
2nd Row Heated Seat Switches And Bezel
The two momentary, bidirectional rocker-type heated seat switches provide a resistive multi-plexed signal to the heated seat module via a hard-wired
mux circuit. Each switch has a center neutral position and Low and High position so that both 2nd row seat passengers can select a preferred level of seat
heating. Each heated seat switch has two Light-Emitting Diode (LED) indicator lamps, which indicate the selected mode (Low or High) of the system.
These indicator lamps also provide diagnostic feedback for the 2nd row heated seat system. Each switch also contains an incandescent bulb, which
provides back lighting of the switch when the headlamps or park lamps are on.
The heated seat switches are both mounted in the 2nd row seat center console. The two switches are snapped into mounting holes in the console switch
bezel. The heated seat switches are differentiated by the keyway in the electrical connector receptacle on the backs of the switches and a keyway on the
switch housing. The wire harness connectors for the heated seat switches are keyed to match the connector receptacles on the switches so that the two
heated seat switches can only be connected to the proper heated seat electrical.
The two LED indicator lamps and the incandescent bulb in each heated seat switch cannot be repaired. If the indicator lamps or back lighting bulb are
faulty or damaged, the individual heated seat switch must be replaced.
The 2nd row 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 High or Low position provides a hard-wired resistance signal to the heated seat module. This
signals 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 (Low or High) than the currently selected state, the heated seat module will change states to support the new selection. If
a heated seat switch is depressed a second time, the heated seat module interprets the second input as a request to turn the seat heater OFF.
The ground side of each LED indicator lamp is controlled by the heated seat module. This control of the switch indicator lamps also allows the module
to provide diagnostic feedback to the vehicle operator or technician to indicate heated seat system faults by flashing the indicator lamps on and off. Refer
to Heated Seat System Diagnosis and Testing for more information.