Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001FP5G
Model Year Start: 2019 Model: RAV4 Prod Date Range: [11/2018 - 10/2022]
Title: METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: Operating Light Control Rheostat does not Change Light Brightness; 2019 - 2022 MY RAV4 RAV4 HV [11/2018 - 10/2022]

Operating Light Control Rheostat does not Change Light Brightness

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 switch.

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.

HINT:

  • The meter illumination level can be adjusted by pressing the light control rheostat switch.
  • 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.

PROCEDURE

1.

READ VALUE USING TECHSTREAM

(a) Using the Techstream, read the Data List.

Click here 2019 - 2020 MY RAV4 RAV4 HV [11/2018 - 08/2020]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: DATA LIST / ACTIVE TEST 2021 - 2022 MY RAV4 RAV4 HV [08/2020 - 10/2022]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: DATA LIST / ACTIVE TEST

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Meter Day Mode Switch

Light control rheostat (tail cancel switch) signal

OFF or ON

OFF: Light control rheostat (tail cancel switch) off

ON: Light control rheostat (tail cancel switch) on

-

Rheostat value

Light control rheostat input signal

Min.: 0.00%, Max.: 100.02% or Unset

Light control rheostat dark (0.00%) → bright (100.02%)

-

Body Electrical > Combination Meter > Data List

Tester Display

Meter Day Mode Switch

Rheostat value

OK:

Light control rheostat condition displayed on the Techstream changes with the actual switch operation.

OK

REPLACE COMBINATION METER ASSEMBLY

NG

2.

INSPECT LIGHT CONTROL RHEOSTAT

(a) Remove the light control rheostat.

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; METER / GAUGE / DISPLAY: LIGHT CONTROL RHEOSTAT: REMOVAL

(b) Inspect the light control rheostat.

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; METER / GAUGE / DISPLAY: LIGHT CONTROL RHEOSTAT: INSPECTION

NG

REPLACE LIGHT CONTROL RHEOSTAT

OK

3.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - LIGHT CONTROL RHEOSTAT)

(a) Disconnect the G18 combination meter assembly connector.

(b) Disconnect the G108 light control rheostat connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

G18-34 (SW1) - G108-5 (T)

Always

Below 1 Ω

G18-17 (TC) - G108-3 (TC)

Always

Below 1 Ω

G18-16 (SW2) - G108-4 (TR)

Always

Below 1 Ω

G18-11 (SW3) - G108-2 (E)

Always

Below 1 Ω

G18-34 (SW1) or G108-5 (T) - Body ground

Always

10 kΩ or higher

G18-17 (TC) or G108-3 (TC) - Body ground

Always

10 kΩ or higher

G18-16 (SW2) or G108-4 (TR) - Body ground

Always

10 kΩ or higher

G18-11 (SW3) or G108-2 (E) - Body ground

Always

10 kΩ or higher

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR