Durango 2WD V8-4.7L (2008)
Memory Positioning Module: Description and Operation
Memory Seat Module - Operation
OPERATION
POWER/MEMORY SEAT
The memory seat module receives input from the 8-way power seat switch, the driver seat position sensors, adjustable pedal control circuits (switch,
sensor, and motor), and the data bus circuit. The memory switch, is wired to the memory mirror module which sends the message over the data bus.
The memory seat module performs the following functions:
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Positions the driver seat (vertical, horizontal, and recliner positions) and adjustable pedals.
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Sends the memory save or recall (#1 or #2) command over the data bus circuit to the memory mirror modules, HVAC, and radio.
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Provides for "linking" the key FOBs to memory.
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Provides for the easy entry/exit feature.
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Provides the tilt mirrors in reverse feature
When a memory button is pressed (#1 or #2) on the memory switch, the driver door memory mirror module sends a recall message to the memory seat
module (MSM). Then the MSM will position the driver seat and adjustable pedals to its preprogrammed location/setting. When the Remote Keyless
Entry (RKE) Transmitter button is pressed, depending on which transmitter (#1 or #2), the SKREEM (RKE Receiver) sends the recall request and FOB
number (#1 or #2) data message. This RKE transmitter function depends on if the MSM is programmed to trigger the recall (linked FOBs).
A memory setting is saved by pressing the "set" button, then pressing either the memory "1" or "2" button within 5 seconds of pressing the "set" button.
A memory setting is recalled by pressing either the memory "1" or "2" button, or by pressing the unlock button on a "linked" Remote Keyless Entry
(RKE) transmitter.
For driver safety, memorized settings can not be recalled if the transmission is in any position other than park or the seat belt is latched.
A key FOB is "linked" to a memory setting by pressing the "set" button and then pressing either the memory "1" or "2" button within 5 seconds of
pressing the set button, then by pressing the "lock" button on the selected key FOB.
The memory system "Easy Entry and /Exit" feature provides the driver with more room to enter or exit the vehicle. The Easy Entry and Exit feature is
disabled when the vehicle leaves the factory. An authorized dealer can enable this feature. When the seat is in a memorized position, it will move
rearward 55 millimeters or to the end of its travel, whichever occurs first, when the key is removed from the ignition switch lock cylinder. The seat will
return to the memory position when the driver turns the vehicle's ignition switch out of the LOCK position.
The memory system "learns" the seat and adjustable pedal motor maximum end positions when the motor reaches the limit of travel in any direction and
stalls. Subsequently, movement will stop just short of that position to avoid extra stress on the motors and mechanisms. If the system learned a maximum
position as a result of an obstruction, as for instance if a large object was placed on the floor behind the seat, the system can relearn the "true" maximum
position through manually operating the power seat after the obstruction is removed.
NOTE: It is normal for the power accessories contained in the memory system to stop at the maximum "learned" position and then continue to
the "true" maximum position when the control switch is released and then applied in the same direction a second time.
Certain functions and features of the memory system rely upon resources shared with other electronic modules in the vehicle over the Controller Area
Network (CAN) bus. The CAN bus allows the sharing of sensor information. This helps to reduce wire harness complexity, internal controller hardware,
and component sensor current loads. At the same time, this system provides increased reliability, enhanced diagnostics, and allows the addition of many
new feature capabilities. For diagnosis of these electronic modules or of the CAN bus, the use of a scan tool and the proper diagnostic information are
needed.
The tilt mirrors in reverse feature provides for tilting the sideview (outside) mirrors down a predetermined angle, providing a better view of the ground
next to the rear portion of the vehicle. The tilt mirrors in reverse feature is disabled when the vehicle leaves the factory. An authorized dealer can enable
this feature. Operation of the tilt mirrors is as follows:
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Sideview mirrors will tilt down when the vehicle transmission is shifted into Reverse.
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Sideview mirrors will return to the original position when the vehicle transmission is shifted out of Reverse.
ADJUSTABLE PEDALS
The pedals swing on a large arc, the radius and angle of which were selected on the basis of ergonomic studies, that puts them in the proper position for
use by the smaller driver - higher and angled upward as well as rearward. Powered by the small electric motor driving a gear train at each pedal,
adjustment is precise, quiet, and smooth throughout the range. A paddle-type switch on the instrument panel to the left of the steering column actuates
the electric motor-driven mechanism through the memory seat module (MSM). Pushing up the paddle brings the pedals closer and vice versa. Movement
