Failing to investigate the cause of the following warnings may lead to the system operating abnormally and possibly cause an accident.
Have the vehicle inspected by your Toyota dealer immediately.


Stop the vehicle immediately.
Follow the correction procedures.System Diagram
SYSTEM DIAGRAM
Communication Table
Transmitting ECU
Receiving ECU
Signal
Communication Method
Skid control ECU
AWD control ECU
Wheel speed sensor signal
Stop ...
Driver Side Door ECU Communication Stop (B2321)
DESCRIPTION
This DTC is stored when LIN communication between the power window regulator
motor assembly (for driver side) and main body ECU (driver side junction block assembly)
stops for more than 10 seconds.
DTC No.
DTC Detection ...
Inspection
INSPECTION
PROCEDURE
1. INSPECT REAR NO. 3 SPEAKER ASSEMBLY (for 13 Speakers)
(a) With the speaker installed, check that there is no looseness or other abnormalities.
(b) Check that there is no foreign matter in the speaker, no tears on the speaker
cone ...