The following items must be initialized for normal system operation in cases such as after the battery is reconnected, or maintenance is performed on the vehicle.

Initialization
For ownersBrake Switch "A" / "B" Correlation (P0504)
DESCRIPTION
The stop light switch is a duplex system that transmits 2 signals: STP and ST1-.
These 2 signals are used by the ECM to monitor whether or not the brake system is
working properly. If signals which indicate the brake pedal is being depressed a ...
LVL Terminal Circuit
DESCRIPTION
By connecting terminals LVL and CG of the DLC3, the headlight leveling
ECU assembly initializes the height control sensor signal.
WIRING DIAGRAM
PROCEDURE
1.
CHECK HARNESS AND CONNECTOR (DLC3 - HEADLIGH ...
System Voltage (P0560)
DESCRIPTION
The battery supplies electricity to the ECM even when the ignition switch is
off. This power allows the ECM to store data such as DTC history, freeze frame data
and fuel trim values. If the battery voltage falls below a minimum level, the stor ...