DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK CAN COMMUNICATION SYSTEM
PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DIMMER SWITCH)
REPLACE COMBINATION METER ASSEMBLY
CHECK COMBINATION METER ASSEMBLY
METER / GAUGE SYSTEM - Meter Illumination is Always Dark
DESCRIPTION
w/ Multi-information Display:
In this circuit, the combination meter assembly receives auto dimmer signals from the main body ECU using the CAN communication lines. When the combination meter assembly 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 the daytime.
- When the meter illumination does not dim at night, the light control rheostat position is in the TAIL cancel position, or there may be a malfunction in the automatic light control sensor, main body ECU, CAN communication system, wire harness or connector, or combination meter.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.CHECK CAN COMMUNICATION SYSTEM |
Check for DTCs ().
Result| Result | Proceed to |
| DTC is not output | A |
| CAN communication system (for LHD) DTC is output | B |
| CAN communication system (for RHD) DTC is output | C |
| Lighting system DTC (B1244) is output | D |
| | Go to CAN COMMUNICATION SYSTEM ()
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| | Go to CAN COMMUNICATION SYSTEM ()
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| 2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DIMMER SWITCH) |
Operate the intelligent tester according to the display and select Active Test.
Main Body| Tester Display | Test Part | Control Range | Diagnostic Note |
| Dimmer Signal | Illumination dimming operation | ON or OFF | - |
- OK:
- Meter illumination is dimmed when the dimmer switch is ON.
- Refer to the sensitivity setting in the customization table of the automatic light control system ().
| OK | |
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| CHECK LIGHTING SETTING ()
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| 3.REPLACE COMBINATION METER ASSEMBLY |
Temporarily replace the combination meter with a new one ().
| 4.CHECK COMBINATION METER ASSEMBLY |
Check that the operation of the combination meter returns to normal ().
- OK:
- Operation of combination meter returns to normal.
| | REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH) |
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| OK | |
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| END (COMBINATION METER IS DEFECTIVE) |
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