DESCRIPTION Based on changes in the power source voltage, the main body ECU (multiplex network body ECU) can detect if the auxiliary battery has been disconnected and reconnected. WIRING DIAGRAM  CAUTION / NOTICE / HINT NOTICE:
PROCEDURE
(a) Disconnect the 4F instrument panel junction block assembly connector. (b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(a) Remove the main body ECU (multiplex network body ECU). Click here
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Lane Departure Alert System (w/ Steering Control)(for Hv Model): Communication Error from FCM to Driving Support ECU (C1A72)
DESCRIPTION If a communication error between the driving support ECU assembly and forward recognition camera is detected, DTC C1A72 is stored. DTC No. Detection Item DTC Detection Condition Trouble Area C1A72 Communication Error from FCM to Driving Support ECU 2 seconds after the power switch is tur ...
