Lexus IS250 IS220d GSE20 ALE20 - METER

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

SYSTEM CHECK

READ VALUE OF INTELLIGENT TESTER (RHEOSTAT VOL)

READ VALUE OF INTELLIGENT TESTER (TAIL CANCEL SW)

INSPECT LIGHT CONTROL RHEOSTAT

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

READ VALUE OF INTELLIGENT TESTER (TAIL CANCEL SW)

INSPECT LIGHT CONTROL RHEOSTAT

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

METER / GAUGE SYSTEM - Operating Light Control Rheostat does not Change Light Brightness

DESCRIPTION

The meter CPU receives signals for adjusting illumination on the meter and instrument panel from this circuit.
The meter CPU detects the illumination level selected by the user according to the position of the rheostat knob.
  • HINT:
This model is equipped with an Optitron meter, therefore the meter illuminates even in the daytime.
The meter illumination level can be adjusted by turning the rheostat.
The meter illumination dims when the light control switch is turned to the TAIL or HEAD position at night.
Turning the rheostat knob fully clockwise cancels the above dimmer control.

WIRING DIAGRAM

Meter / Gauge System - Operating Light Control Rheostat Does Not Change Light Brightness. METER. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.SYSTEM CHECK
  • Result:
  • ResultProceed to
    Meter illumination does not change when operating the light control rheostat knobA
    Dimmer cancel does not operateB
B
Go to step 7
A
2.READ VALUE OF INTELLIGENT TESTER (RHEOSTAT VOL)

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG).

Turn the tester ON.

Enter the following menus: Diagnosis / Body / Combination Meter / Data List.

Check the values by referring to the table below.

Combination Meter:
ItemMeasurement Item/Range (Display)Normal ConditionDiagnostic Note
Light Control RheostatLight control rheostat/Min.: 0, Max.: 255Light control rheostat switch is Dark (0) → Bright (255)-
  • OK:
  • The value displayed on the tester gradually changes according to the actual rheostat operation.
NG
Go to step 4
OK
3.READ VALUE OF INTELLIGENT TESTER (TAIL CANCEL SW)

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG).

Turn the tester ON.

Enter the following menus: Diagnosis / Body / Combination Meter / Data List.

Check the values by referring to the table below.

Combination Meter:
ItemMeasurement Item/Range (Display)Normal ConditionDiagnostic Note
Tail Cancel SWTail cancel switch is ON/OFFON: Light control rheostat is turned fully clockwise
OFF: Light control rheostat position is except above		-
  • OK:
  • Rheostat position displayed on the tester is the same as the actual rheostat position.
NG
Go to step 7
OK
REPLACE COMBINATION METER ASSEMBLY
4.INSPECT LIGHT CONTROL RHEOSTAT
Meter / Gauge System - Operating Light Control Rheostat Does Not Change Light Brightness. METER. Lexus IS250 IS220d GSE20 ALE20

Remove the light control rheostat with the connector still connected.

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

  • Standard resistance:
  • Tester ConnectionConditionSpecified Condition
    E (J15-1) - RV (J15-4)Turn the rheostat knob fully clockwise8 to 12 kΩ
    E (J15-1) - RV (J15-4)Rheostat knob is between MIN. and MAX.The value changes gradually
    (Between approx. 0 and 8 kΩ)
    E (J15-1) - RV (J15-4)Turn the rheostat knob fully counterclockwiseApprox. 0 Ω
NG
Go to step 7
OK
REPLACE COMBINATION METER ASSEMBLY
7.INSPECT LIGHT CONTROL RHEOSTAT
Meter / Gauge System - Operating Light Control Rheostat Does Not Change Light Brightness. METER. Lexus IS250 IS220d GSE20 ALE20

Remove the light control rheostat with the connector still connected.

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

  • Standard resistance:
  • Tester ConnectionConditionSpecified Condition
    T (J15-2) - TC (J15-3)Turn the rheostat knob fully counterclockwiseBelow 1 Ω
    T (J15-2) - TC (J15-3)Turn the rheostat knob fully clockwise10 kΩ or higher
NG
REPLACE LIGHT CONTROL RHEOSTAT
OK
8.CHECK HARNESS AND CONNECTOR (COMBINATION METER - LIGHT CONTROL RHEOSTAT)
Meter / Gauge System - Operating Light Control Rheostat Does Not Change Light Brightness. METER. Lexus IS250 IS220d GSE20 ALE20

Disconnect the J34 and J15 connectors.

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

  • Standard resistance:
  • Tester ConnectionConditionSpecified Condition
    J34-8 (TC) - J15-2 (TC)AlwaysBelow 1 Ω
    J15-2 (TC) - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE COMBINATION METER ASSEMBLY
LEXUS IS250, IS220d / GSE20 ALE20
METER
Lexus IS250 IS220d GSE20 ALE20
METER / GAUGE SYSTEM