Meter Illumination is Always Dark [08/2015 - 08/2019]: Description

In this circuit, the combination meter assembly receives auto dimmer signals from the main body ECU (multiplex network body ECU) using the CAN communication system (CAN No. 1 Bus). When the combination meter assembly receives an auto dimmer signal, it dims the meter illumination (warning and indicator lights). The main body ECU (multiplex network 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 (multiplex network body ECU) determines that it is nighttime and the light control switch is in the tail, head or AUTO position, the ECU sends an auto dimmer signal. According to the signal, the combination meter assembly dims the meter illumination.

HINT: 

When the meter illumination is always dark, there may be a malfunction in the light control rheostat, automatic light control sensor, main body ECU, CAN communication system, harness, connector or combination meter assembly.