Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Operating Light Control Rheostat does not Change Light Brightness

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Interior / Meter / Gauge / Display / Meter / Gauge System / 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.
  • When replacing the combination meter assembly, update the ECU security key.

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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 GTS

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

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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 GTS changes with the actual switch operation.

OK

REPLACE COMBINATION METER ASSEMBLY

NG

2.

INSPECT LIGHT CONTROL RHEOSTAT

Click here

NG

REPLACE LIGHT CONTROL RHEOSTAT

OK

3.

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

(a) Disconnect the I5 combination meter assembly connector.

(b) Disconnect the I228 light control rheostat connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I5-11 (SW1) - I228-5 (T)

Always

Below 1 Ω

I5-10 (TC) - I228-3 (TC)

Always

Below 1 Ω

I5-28 (SW2) - I228-4 (RV)

Always

Below 1 Ω

I5-26 (SW3) - I228-2 (E)

Always

Below 1 Ω

I5-11 (SW1) or I228-5 (T) - Body ground

Always

10 kΩ or higher

I5-10 (TC) or I228-3 (TC) - Body ground

Always

10 kΩ or higher

I5-28 (SW2) or I228-4 (RV) - Body ground

Always

10 kΩ or higher

I5-26 (SW3) or I228-2 (E) - Body ground

Always

10 kΩ or higher

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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