RM35X0E _58 Vehicle Interior _078337 METER / GAUGE / DISPLAY _0379907 METER / GAUGE SYSTEM J

METER / GAUGE / DISPLAY  METER / GAUGE SYSTEM  Meter Illumination does not Dim at Night  


DESCRIPTION

In this circuit, the combination meter assembly receives auto dimmer signals from the main body ECU (multiplex network body ECU) via CAN communication. 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 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 to the combination meter assembly.

According to this signal, the combination meter assembly dims the meter illumination.

HINT:

When the meter illumination does not dim at night, there may be a malfunction in the automatic light control sensor, main body ECU (multiplex network body ECU), CAN communication system, wire harness, connector, or combination meter assembly.


WIRING DIAGRAM

E407708E01
4.667,1.583 6.542,1.917 1.875,0.333 10 false Combination Meter Assembly 0.698,2.26 2.781,2.563 2.083,0.302 10 false : CAN Communication Line 1.073,1.604 2.719,2.042 1.646,0.438 10 false Main Body ECU (Multiplex Network Body ECU)

CAUTION / NOTICE / HINT

NOTICE:

When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.


HINT:
·

Setting the meter illumination level to maximum brightness prevents the meter illumination from dimming when the light control switch is changed to the tail, head or AUTO position at night. Therefore, check the meter illumination setting before proceeding to the following steps.

·

The automatic light control sensor sensitivity can be customized. (w/ Automatic Light Control System)

w/ Headlight ECU: Click hereVehicle Exterior>LIGHTING (EXT)>LIGHTING SYSTEM (w/ Headlight ECU)>CUSTOMIZE PARAMETERS

w/o Headlight ECU: Click hereVehicle Exterior>LIGHTING (EXT)>LIGHTING SYSTEM (w/o Headlight ECU)>CUSTOMIZE PARAMETERS

·

If the main body ECU (multiplex network body ECU) is replaced, refer to the Service Bulletin.*

*: w/ Entry and Start System



PROCEDURE

2.CHECK FOR DTC (LIGHTING SYSTEM)
a.

Check if lighting system DTCs are output.

w/ Headlight ECU: Click hereVehicle Exterior>LIGHTING (EXT)>LIGHTING SYSTEM (w/ Headlight ECU)>DTC CHECK / CLEAR

w/o Headlight ECU: Click hereVehicle Exterior>LIGHTING (EXT)>LIGHTING SYSTEM (w/o Headlight ECU)>DTC CHECK / CLEAR

Body Electrical > Main Body > Trouble Codes
50001 123
OK:

DTC B1244 is not output.



Result:
Proceed to
OK
NG



OK

3.CHECK COMBINATION METER ASSEMBLY

NG

GO TO DTC B1244

w/ Headlight ECU: Click hereVehicle Exterior>LIGHTING (EXT)>LIGHTING SYSTEM (w/ Headlight ECU)>B1244

w/o Headlight ECU: Click hereVehicle Exterior>LIGHTING (EXT)>LIGHTING SYSTEM (w/o Headlight ECU)>B1244


3.CHECK COMBINATION METER ASSEMBLY
a.

Replace the combination meter assembly with a new one.

Click hereVehicle Interior>METER / GAUGE / DISPLAY>COMBINATION METER>REMOVAL


b.

Check the operation.

OK:

The operation of the combination meter assembly returns to normal.



Result:
Proceed to
OK
NG



OK

END (COMBINATION METER ASSEMBLY IS DEFECTIVE)

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

for LHD:Power Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for LHD)>REMOVAL

for RHD:Power Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for RHD)>REMOVAL