The emergency flashers are used to warn other drivers when the vehicle has to be stopped in the road due to a breakdown, etc.

Press the switch.
All the turn signal lights will flash. To turn them off, press the switch once again.
- Emergency flashers
If the emergency flashers are used for a long time while the engine is not operating, the battery may discharge.
If your vehicle needs to be towedVehicle Speed or Engine Speed Signal Malfunction (C2173/73)
DESCRIPTION
The tire pressure warning ECU receives a vehicle speed signal from the combination
meter and an engine speed signal from the ECM. The tire pressure warning ECU uses
these signals to detect DTCs C2121/21 to C2124/24 (No Signal from Transmitter) ...
Throttle / Pedal Position Sensor "A" Minimum Stop Performance (P2109)
DESCRIPTION
The idle speed is controlled by the Electronic Throttle Control System (ETCS).
The ETCS is comprised of a throttle actuator, which operates the throttle valve,
and a throttle position sensor, which detects the opening amount of the throttle
...
Precaution
PRECAUTION
1. PRECAUTION FOR DISCONNECTING THE BATTERY CABLE
NOTICE:
When disconnecting the cable from the negative (-) battery terminal, initialize
the following systems after the cable is reconnected.
System Name
See Procedure
...