Memory System: Notes

The memory system consists of power left front seat, power mirror(s) 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, exterior mirror(s), 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 side view mirror(s) along with setting the radio presets. If the drivers seat or exterior mirror(s) are inoperative from their own respected switches, use the service information and schematic to diagnose the problem. This article addresses the memory problems only and it is assumed there is not a basic component failure.