DTC 5-1: LEXUS Link Communication Error: Description

This DTC is output when one of the following occurs: 1) the mayday ECU is malfunctioning; 2) the cowl side junction block RH (main body ECU RH) is malfunctioning; or 3) the BEAN line is open or short.

DTC No.	DTC Detection Condition	Trouble Area
5-1	Communication or communication line is abnormal between mayday ECU and other ECU	Mayday ECU Light control switch circuit Cowl side junction block RH (Main body ECU RH) Another BEAN line ECU Wire harness