The following warning indicates the possibility of damage to the vehicle that may lead to an accident. Immediately stop the vehicle in a safe place and contact your Toyota dealer.

Stop the vehicle immediately. Continuing to drive the vehicle may be dangerous.
Have the vehicle inspected immediately.Brake Signal Malfunction (B2284)
DESCRIPTION
The power management control ECU receives brake signal information from 2 sources.
It receives a signal from the stop light switch assembly via a direct line, and
a signal from the ECM via CAN. If the information from these 2 sources is incons ...
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use the following procedure to troubleshoot the front power seat control
system (w/ Memory).
*: Use the Techstream.
PROCEDURE
1.
VEHICLE BROUGHT TO WORKSHOP
...
Inspection
INSPECTION
PROCEDURE
1. INSPECT DRIVE MONITOR SWITCH
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
3 (E) - ...