Meter Illumination is Always Dark: Description
- In this circuit, the meter CPU receives auto dimmer signals from the main body ECU RH using the BEAN lines.
- When the meter CPU receives an auto dimmer signal, it dims the meter illumination.
- The main body ECU RH determines whether it is daytime, twilight, or nighttime based on the waveform transmitted from the automatic light control sensor.
- If the main body ECU RH determines that it is daytime, the ECU does not send auto dimmer signals.
- Therefore, the meter illumination (warning and indicator lights) will not dim even if the driver accidentally turns the light control switch to the TAIL or HEAD position in daytime.