DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK DTC
PERFORM ACTIVE TEST BY INTELLIGENT TESTER
REPLACE COMBINATION METER ASSEMBLY
METER / GAUGE SYSTEM - 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.
WIRING DIAGRAM
INSPECTION PROCEDURE
Check if DTC B1244 is output .
- Result:
| Result | Proceed to |
| B1244 is not output | A |
| B1244 is output | B |
| 3.REPLACE COMBINATION METER ASSEMBLY |
- OK:
- The operation of the combination meter assembly returns to normal.
LEXUS IS250, IS220d / GSE20 ALE20