Meter Illumination Does Not Dim At Night
Meter Illumination does not Dim at NightDESCRIPTION
In this circuit, the meter CPU receives auto dimmer signals from the main body ECU using the CAN communication lines (CAN MS Bus). When the meter CPU receives an auto dimmer signal, it dims the meter illumination. The main body ECU determines whether it is daytime, twilight, or nighttime based on the waveform transmitted from the automatic light control sensor. If the main body ECU 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.
HINT: When the meter illumination does not dim at night, the light control rheostat position is at the tail cancel position, or there may be a malfunction in automatic light control sensor, main body ECU, CAN communication system, wire harness or connector, or combination meter assembly.
Wiring Diagram:
Step 1:
Step 1 (Continued)-4:
Step 4 (Continued):
INSPECTION PROCEDURE