The following warning indicates a possible problem in the brake system.
Immediately stop the vehicle in a safe place and contact your Toyota dealer.

If a warning light turns on or a warning buzzer sounds...
Stop the vehicle immediately.Speaker Output Short (B15C3)
DESCRIPTION
This DTC is stored when a malfunction occurs in the speakers.
DTC No.
DTC Detection Condition
Trouble Area
B15C3
A short is detected in the speaker output circuit.
...
Installation
INSTALLATION
PROCEDURE
1. INSTALL BRAKE PEDAL SUPPORT ASSEMBLY
(a) Install the brake pedal support assembly to the instrument panel
reinforcement with the bolt.
Torque:
19 N·m {195 kgf·cm, 14 ft·lbf}
...
Relay
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT STARTER RELAY
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
...