Power Seat Control Module: Description and Operation

The Memory Seat Module (MSM) is located underneath the driver seat, towards the front and on the outboard side. It is used in conjunction with the other modules in the memory system to recall the seat to one of two preset seat functional adjustments (horizontal, vertical, and recliner). The switch for the memory seat programming and selection mounts on the driver door trim panel. The MSM also controls the adjustable pedals, both for the memory and manual functionality. The adjustable accelerator and brake pedals are available on SLT and Limited models. On Limited, their positioning can be stored for recall by the memory system, allowing for two drivers to have unique, pre-programmed settings.

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:

- Positions the driver seat (vertical, horizontal, and recliner positions) and adjustable pedals.
- Sends the memory save or recall (#1 or #2) command over the data bus circuit to the memory mirror modules, HVAC, and radio.
- Provides for "linking" the key FOBs to memory.
- Provides for the easy entry/exit feature.
- 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.

Easy Entry and Exit provides the driver with more room for entry or exit from the vehicle. The Easy Entry and Exit feature is disabled when the vehicle leaves the factory. An authorized dealer can enable this feature. Operation of the Easy Entry and Exit function is as follows:

- If the seat is in a memorized position, it will move back a predetermined distance when the driver removes the key from the ignition switch. This new position for the seat is the Easy Exit position for that driver. The seat may not move to an easy entry/exit position, if it is already position at or behind a predetermined point for the seat. This limited travel avoids obstructed customer exit/entry from behind the driver's rear door post.
- The seat will move forward to a memory position when the driver turns the vehicle's ignition switch out of the LOCK position.
- 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:
- Sideview mirrors will tilt down when the vehicle transmission is shifted into Reverse.
- 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 stops when the switch is released. MSM logic prevents pedal adjustment when the automatic speed control (cruise control) is set (controlling speed), and when the transmission is in reverse. This feature protects against a loss of reference position when neither foot is on the pedal.