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8Ns - 30
POWER SEAT SYSTEM
LUMBAR CONTROL SWITCH (Continued)
Fig. 2 CS Driver Seat Switch Assembly
1 - Memory Position #2
2 - Memory Position #1
3 - Memory Set Switch
4 - Power Seat Recline Switch
5 - Power Lumbar Switch
6 - Adjustable Foot Pedal Switch
7 - Power Seat Cushion Switch
OPERATION
When the lumbar control switch is moved forward
or rearward, a resistance signal is sent to the Driver
Door Module via hard wired connections. The driver
door module then sends the request to the Memory
Heated Seat Adjustable Pedal Module (MHSAPM)
via the PCI data bus circuit. The MHSAPM is
responsible for controlling the 12v battery feed and
ground path to the lumbar motor to control the seat
back power lumbar mechanism accordingly.
DIAGNOSIS AND TESTING - LUMBAR
CONTROL SWITCH
(1) The lumbar control switch used on CS vehicles
is incorporated into the driver seat switch assembly.
For diagnostic routine (Refer to 8 - ELECTRICAL/
POWER SEATS/DRIVER SEAT SWITCH - DIAGNO-
SIS AND TESTING).
MEMORY SET SWITCH
DESCRIPTION
The memory set switch is one of eight separate
switches ganged together in driver seat switch
assembly. The switch is located on the drivers front
door trim panel (Fig. 3). The memory set switch will
flash red when pressed until a position button is
pressed or it times out. The driver seat switch assem-
bly can provide up to six major resistive multiplexed
inputs into the driver door module. The inputs can
include memory, heated seat, seat front up/down and
foot pedal forward, seat rear up/down and pedal
backwards, seat forward/backward and lumbar aft.,
recline forward/backward and lumbar backwards. All
inputs are hardwired resistive mux to the driver door
module to decode axis direction or seat heat level.
Refer to Driver Door or Memory Heated Seat Adjust-
able Pedal Modules in the Electronic Control Mod-
ules section for additional information.
Fig. 3 CS Driver Seat Switch Assembly
1 - Memory Position #2
2 - Memory Position #1
3 - Memory Set Switch
4 - Power Seat Recline Switch
5 - Power Lumbar Switch
6 - Adjustable Foot Pedal Switch
7 - Power Seat Cushion Switch
The memory set switch cannot be adjusted or
repaired and, if faulty or damaged, the complete
driver seat switch assembly must be replaced.
CS
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