RX 300 FWD V6-3.0L (1MZ-FE) (1999)
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Information Bus: Description and Operation
Diagnosis System
DIAGNOSIS SYSTEM
a. As shown in the following illustration, each ECU of this vehicle is connected by communication bus and it transmits each signal by
communication. This communication bus is self-diagnosed by Body No.1 ECU and it memorizes DTC when it detects communication stop to
ECU or communication bus +B short or GND short. There is a possibility that Body No.1 ECU cannot self-diagnose accurately unless it doesn't
work normal. So, please note that the troubleshooting of Body Electrical System should be done after confirming it Body No.1 ECU and Open
door indicator works normal by 2 "BASIC INSPECTION" described later.
