Toyota Yaris: Meter / Gauge System / Meter Illumination is Always Dark

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Vehicle Interior / Meter / Gauge / Display / Meter / Gauge System / Meter Illumination is Always Dark

DESCRIPTION

The combination meter assembly receives signals from this circuit to adjust the illumination of the combination meter assembly. The combination meter assembly sets the illumination level based on the user operation of the light control rheostat.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
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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:

The meter illumination dims when the taillights are turned on.
Setting the meter illumination level to maximum brightness cancels the above dimming of the meter illumination.
Setting the meter illumination level to minimum brightness turns off the meter illumination.
The automatic light control sensor sensitivity can be customized.
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PROCEDURE

1.	CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication DTCs are output.

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Result	Proceed to
DTCs are not output	A
DTCs are output	B

GO TO CAN COMMUNICATION SYSTEM

2.	CHECK FOR DTC (LIGHTING SYSTEM)

(a) Check if lighting system DTCs are output.

Body Electrical > Main Body > Trouble Codes

OK:

DTC B124400 is not output.

GO TO DTC B124400

3.	CHECK COMBINATION METER ASSEMBLY

(a) Replace the combination meter assembly with a new one.

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(b) Check the operation.

OK:

The operation of the combination meter assembly returns to normal.

END (COMBINATION METER ASSEMBLY IS DEFECTIVE)

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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