Memory Seat and Mirror System

MEMORY SEAT AND MIRROR SYSTEM
Memory Seat and Mirror System is available only on Town and Country (Luxury Class) vehicles.

The Memory Seat/Mirror Module (MSMM) is mounted under the driver's seat, on the inboard upper track with Torx head screws. The MSMM provides the driver with an adjustable seat, recliner, and power side view mirror positioning control that remembers stored positions and will recall those positions on command.

The MSMM reads all seat and recliner switch inputs and operates the seat and recliner motors in response to switch actuation. The MSMM monitors position sensing potentiometers (mounted on the motors) for seat and recliner positioning.

Soft stops are set each time the track is physically stalled (i.e. an obstruction in the seat's path). This is used by the MSMM to not run the motor into a stall condition on subsequent movement. However, this can unduly restrict the seat's range of travel if the stall was due to something other than the true end of travel.

The MSMM operates the power side view mirror motors through solid state drivers (electronic switches) in the recall mode only, and follows the glass face position by means of rheostats built into the motor pack assembly of the mirrors. Normal electrical operation of the mirrors is accomplished by actuation of the power mirror switch.

The MSMM monitors the memory switches and has the capability to store desired positions in nonvolatile memory in response to a valid input sequence. Refer to Memory Selector Switches (1, 2, and S) and Remote Keyless Entry (RKE) Data Link. The memory seat/mirror module also can activate the previously described motors in response to a recall request from an individual memory switch.

The MSMM monitors a data link from the BCM and will respond to stored information or modify stored information when requested by a valid data stream.

The MSMM is connected to the system through a seat wiring harness that interfaces with all of the components within the seat structure, and with electrical distribution wiring harness connections to the non-seat mounted components. The module operates the seat and recliner motors through relays: four dedicated to track forward/rearward, track front up/down, track rear up/down, and recliner forward/ rearward. A fifth relay controls the direction of operation of those motors.

MEMORY SELECTOR SWITCH
The Memory Selector Switch is mounted on the driver's door trim panel within easy reach of the driver. It provides a means to set or recall either of two positions of seat, recliner, and side view mirrors as chosen by the driver.

The inputs from this switch to the MSMM is a ground level signal.
1. Adjust the seat, recliner and side view mirrors to the desired position.
2. Press momentarily and release memory switch.
3. Press momentarily and release the memory switch 1 or 2. Do NOT press any switch for 10 seconds.

For Fob linking, see Remote Keyless Entry (RKE) Data Link.
4. To program the second driver's position, follow the above sequence.
5. To recall either of the programmed positions momentarily press and release either memory switch 1 or 2.

Definition: Momentarily and Release
The MSMM has switch input timing requirements of a minimum press momentarily time of 250 milliseconds (1/4 second) and a maximum hold time of 5 seconds. When buttons must be operated in order, the time between button actuation must be less than 5 seconds that must be met for proper operation of the system.

POWER SIDE VIEW MIRROR POSITION SENSING
The mirror switch on the instrument panel operates the outside rear view mirrors independently of the MSMM. The MSMM activates the mirror motors only when in its recall mode.

The side view mirrors have position sensing rheostats built into each side view mirror vertical and horizontal motor assembly. These rheostats provide a sense voltage to the MSMM that indicates where the mirror is moving to or where its position is at when the MSMM is activated but the mirror motor is not moving.

AUTOMATIC DAY/NIGHT MIRROR SYSTEM
An automatic dimming inside day/night rear view mirror and an automatic dimming driver side outside rear view mirror are available factory-installed options on this model. Following is a general description of this optional equipment.

The automatic day/night mirror is able to automatically change its reflectance. A thin layer of electrochromic material between two pieces of conductive glass make up the face of the mirror. Two photocell sensors are used to monitor light levels and adjust the reflectance of the mirror to reduce the glare of headlamps approaching the vehicle from the rear.

The ambient photocell sensor faces forward, to detect the outside light levels. A second sensor faces rearward to detect the light level received through tie vehicles back window. When the difference between the two light levels becomes too great (the light level received at the rear of the mirror is much higher than that at the front of the mirror), the mirror begins to darken.

The mirror switch allows the driver a manual control of whether the automatic dimming feature is operational. When AUTO is selected a small Light- Emitting Diode (LED), to the right of the mirror switch, is illuminated. The automatic dimming feature will only operate when the ignition switch is in the On position. The mirror also senses the backup lamp circuit, and will automatically disable its self-dimming feature whenever the transmission gear selector is in the Reverse position.

NOTE: The mirror always defaults to an ON state upon ignition.

The driver side automatic mirror is standard with the automatic inside mirror. The signal to control the dimming of that mirror is generated by the automatic day/night inside rear view mirror circuitry. That signal is then delivered to the driver side outside rear view mirror on a hard wired circuit.

The automatic day/night mirror cannot be repaired. If faulty or damaged, the entire inside rear view mirror assembly must be replaced.