METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: Meter Illumination does not Dim at Night; 2022 - 2023 MY RAV4 RAV4 HV [12/2021

Last Modified: 05-08-2025	6.11:8.1.0	Doc ID: RM1000000021INN
Model Year Start: 2022	Model: RAV4	Prod Date Range: [12/2021 - 10/2023]
Title: METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: Meter Illumination does not Dim at Night; 2022 - 2023 MY RAV4 RAV4 HV [12/2021 - 10/2023]

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

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.
Before replacing the main body ECU (multiplex network body ECU), refer to smart key system (for Start Function).
for HV Model:

Click here

for Gasoline Model:

Click here

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.
Click here

PROCEDURE

1.	CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication DTCs are output.

for HV Model:

Click here

for Gasoline Model:

Click here

Result	Proceed to
CAN communication DTCs are not output.	A
CAN communication DTCs are output.	B

GO TO CAN COMMUNICATION SYSTEM

for HV Model:

Click here

for Gasoline Model:

Click here

2.	CHECK FOR DTC (LIGHTING SYSTEM)

(a) Check if lighting system DTCs are output.

Click here

Body Electrical > Main Body > Trouble Codes

OK:

DTC B1244 is not output.

GO TO DTC B1244

3.	CHECK COMBINATION METER ASSEMBLY

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

Click here

(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)