Memory Systems

MEMORY SYSTEM
The memory system consists of power left front seat, power mirrors and radio presets. The Memory Heated Seat/mirror Module (MHSMM) also includes the heated seat function. The module is located under the left front seat and receives input from: left manual 8-way seat switch, left seat position sensors, memory switch, both heated seat switches, both heated seat Negative Temperature Coefficients (NTC's) thermistors), PCI bus circuits, and the power mirror sensors. The module uses these inputs to perform the following functions: position the drivers memory seat, both exterior mirrors, actuate the drivers and passenger heated seat heater and send the memory location over the PCI bus.

When a memory button is pressed (either # 1 or # 2) on the memory switch the MHSMM sends a message to the BCM which in turn sends a recall message to the MHSMM and the PCI radio. They will in turn position the drivers seat and both mirrors along with setting the radio presets. If the drivers seat or either exterior mirrors are inoperative from their own respected switches, use the service information and schematic to diagnose the problem

MEMORY MIRRORS
Each outside mirror has a vertical and a horizontal position sensor. The MHSMM provides a 5-volt reference to each position sensor. The sensors share a common ground circuit. The MHSMM monitors the position of the mirrors by measuring the voltage of each signal. When a memory position is set, the MHSMM monitors and stores the position of the outside mirrors. The MHSMM adjusts the mirrors to the appropriate positions when a memory recall message is received from the RKE or is requested from the memory switch.

The power mirror switch during non-memory operation operates both mirrors independently of the MHSMM.

MEMORY HEATED SEAT MIRROR MODULE
EEPROM Refresh Failure
Front Riser Sensor Out of Range High
Front Riser Sensor Out of Range Low
Front Riser Down Position Stuck
Front Riser Up Position Stuck
Horizontal Sensor Out of Range High
Horizontal Forward Position Stuck
Horizontal Sensor Out of Range Low
Horizontal Rearward Position Stuck
Ignition Status Message Not Received
Driver Thermistor Out of Range High
Driver Thermistor Out of Range Low
Driver Heated Seat Switch Open/Shorted to Ground
Driver Heated Seat Switch Stuck in High State
Driver Heated Seat Switch Stuck in Low State
Driver Mirror Vertical Sensor Out of Range High
Driver Mirror Vertical Sensor Out of Range Low
Driver Mirror Horizontal Sensor Out of Range High
Driver Mirror Horizontal Sensor Out of Range Low
Driver Seat Heat Output Shorted to Ground
Driver Seat Heat Output Open
Memory Set "S" Position Stuck
Memory Position #2 Stuck
Memory Position #1 Stuck
PRNDL Display Message Not Received
Rear Riser Down Position Stuck
Rear Riser Up Position Stuck
Rear Riser Sensor Out of Range Low
Rear Riser Sensor Out of Range High
Recliner Down Position Stuck
Recliner Up Position Stuck
Recliner Sensor Out of Range Low
Recliner Sensor Out of Range High
Passenger Heated Seat Switch Open/Shorted to Ground
Passenger Thermistor Out of Range Low
Passenger Thermistor Out of Range High
Passenger Heated Seat Switch Stuck in High State
Passenger Heated Seat Switch Stuck in Low State
Passenger Seat Heat Output Shorted to Ground
Passenger Seat Heat Output Open
Passenger Mirror Horizontal Sensor Out of Range Low
Passenger Mirror Horizontal Sensor Out of Range High
Passenger Mirror Vertical Sensor Out of Range Low
Passenger Mirror Vertical Sensor Out of Range High