Description & Operation: Notes

WARNING: Deactivate air bag system before performing any service operation. See AIR BAG RESTRAINT SYSTEMS article. DO NOT apply electrical power to any component on steering column without first deactivating air bag system. Air bag may deploy.

NOTE: The multiplex control system may also be referred to as In-Vehicle Multiplexing System (IVMS), or Local Area Network (LAN) system.

The multiplex control system uses a Body Control Module (BCM) and 5 Local Control Units (LCUs) to manage the following electrical systems in the vehicle: power window control, power door lock control, automatic drive positioner control (driver-side power seat and steering column control), anti-theft system, step light control, illumination control, multi-remote control, auto light control (headlights), warning chime and light control, wiper amplifier control, rear window defogger timer control and self-diagnostic system. See Fig 1 -Figure . See COMPONENT LOCATIONS . Some electrical systems are directly connected to the BCM, while some electrical loads and switches are connected to the appropriate LCU.

The BCM uses 3 data lines connected between BCM and LCUs to establish communication and control with each LCU. System has a sleep/wake-up control mode to turn on/off the communication between BCM and LCUs as necessary to prevent unnecessary power consumption. If BCM determines that a signal from an LCU is malfunctioning, system will set appropriate LCU in fail-safe control mode.

Fig 1: Identifying Inputs & Outputs Of Multiplex Control System (Q45)

Courtesy of NISSAN MOTOR CO., U.S.A.