Description & Operation

WARNING: This page is about a different car, the 2002 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Vehicles are equipped with air bag supplemental restraint system. Before attempting any repairs involving steering column, instrument panel or related components, see SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM in AIR BAG RESTRAINT SYSTEMS article.

CAUTION: When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.

NOTE: The body ECU is also referred to as the instrument ECU.

The multiplex communication system includes the following systems:

Automatic Light Control
Door Lock Control
Interior Light
Light Auto Turn Off
Rear Wiper and Washer
Wireless Door Lock Control

Communication is made among the instrument, power seat, remote control mirror and telescopic ECUs (Electronic Control Unit). When the ECU receives a signal from related switches, i.e., the driving position memory switch, the instrument ECU (body ECU) sends signals to the power seat, remote control mirror and telescopic ECUs, and moves each part to the position set by the driving position memory switch.