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CS
POWER SEAT SYSTEM (Continued)
DIAGNOSIS AND TESTING - MEMORY SYSTEM
The most reliable, efficient, and accurate means to
diagnose the memory system requires the use of a
DRB III scan tool and the proper Diagnostic Proce-
dures information. In order to obtain conclusive test-
ing of the memory system, the Programmable
Communications Interface (PCI) data bus network
and all of the electronic modules that provide inputs
to, or receive outputs from the memory system com-
ponents must be checked. The DRB III scan tool can
provide confirmation that the PCI data bus is func-
tional, that all of the electronic modules are sending
and receiving the proper messages on the PCI data
bus, and that the memory system is receiving the
proper hard wired inputs and relaying the proper
hard wired outputs to perform its functions. The scan
tool is used to retrieve any diagnostic trouble codes
(DTC's) that could be related to the memory system.
Following are tests that will help to diagnose the
hard wired components and circuits of the memory
system.
PRELIMINARY TESTS
(1) If any power seat is not operational in any
direction, check the power seat circuit breaker,
located in the Integrated Power Module. If OK, go to
Step 2. Refer to the Power Distribution section for
circuit breaker diagnosis and testing procedure.
(2) Check for proper battery or electrical system
voltage. The CS is equipped with a low-voltage cut-
off feature. If the electrical system voltage drops
below a predetermined set-point (approx. 11.5v), the
power seat system will not function until the proper
system voltage has been restored. If OK, go to Step
3. Refer to the Battery System and/or Charging Sys-
tem section for testing instructions.
(3) Obtain a DRB III scan tool and check for any
stored diagnostic trouble codes recorded in the mem-
ory heated seat adjustable pedal module. Follow the
procedures called out in the proper diagnostic proce-
dures manual to resolve if codes are present.
(4) To check the memory heated seat adjustable
pedal module for proper output, obtain a DRB III
scan tool, energize each seat track motor axis one at
a time. If any axis stops without hitting the end of
travel, the potentiometer signal for that axis may
have an open, short or be mis-wired. Check the wir-
ing to that axis (module to motor). Fix any wiring
problems and retry that axis.
POWER SEAT SYSTEM 8Ns - 25
DRIVER SEAT SWITCH
DESCRIPTION
The driver seat switch assembly includes up to
eight separate switches ganged together in one com-
pact switch assembly (Fig. 1). The switch is located
on the drivers front door trim panel. The driver seat
switch assembly can provide up to six major resistive
multiplexed inputs into the driver door module. The
inputs can include memory, heated seat, power seat,
and foot pedal system requests, depending on how
the vehicle is equipped. 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 Adjustable Pedal Modules in
the Electronic Control Modules section for additional
information.
Fig. 1 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 switch is secured to the back of the front door
trim panel with four clips. The seat switch assembly
cannot be adjusted or repaired. If one switch is dam-
aged or faulty, the entire seat switch assembly must
be replaced.
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