Entire Combination Meter does not Operate: Description

This circuit is the power source circuit for the meter.
This circuit provides two types of power sources; one is a constant power source mainly used as a backup power source, and the other is a power source mainly used for signal transmission. The constant power source is mainly used as a backup power source of the meter CPU, however, it is also used for communication.
If a voltage of 12 V is not applied to terminal IG+ when the engine switch is on (IG), the indicator will not operate.