LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 1999 >> DeVille Base >> Repair and Diagnosis >> Accessories & Equipment >> Memory Modules >> Memory System >> Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Memory System: Description

NOTE: For additional information about power seats, see appropriate POWER SEATS article. For additional information about power mirrors, see appropriate POWER MIRRORS article.

The memory seat and mirror system allows the driver's seat to be set in 4 preset positions: MEMORY 1, MEMORY 2, EXIT 1 and EXIT 2. The Memory Seat Module (MSM) controls movement of 3 seat position motors, 2 lumbar support motors and one recline motor. The Memory Mirror Module (MMM) controls movement of 2 left mirror motors and 2 right mirror motors. All motors have a position sensor, and work independently of each other. On DeVille, MMM receives manual seat operation inputs from left seat switch. MMM then sends a message over the class 2 serial data line to MSM. MSM then supplies voltage to appropriate seat motors. On Eldorado, MSM receives manual seat operation inputs directly from the left seat switch. MSM then supplies voltage to appropriate seat motors.

REGULAR PRODUCTION OPTION (RPO) CODES (1)

RPO Code Description
AL2 4-Way Power Lumbar Support
AM3 2-Way Power Lumbar Support With Massage
(1) RPO label is located on rear wall on passenger's side of trunk.