Operating Light Control Rheostat Does Not Change Light Brightness

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

DESCRIPTION

The meter CPU receives signals to adjust illumination of 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 upwards cancels the above dimmer control.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. SYSTEM CHECK

(a) Turn the ignition switch to ON.

(b) Turn the light control rheostat knob fully upwards.

(c) Turn the light control rheostat knob fully downwards.

(d) Turn the light control rheostat knob fully upwards and while control switch is on TAIL or HEAD.

(e) Check the meter illumination.

Result





B -- READ VALUE USING TECHSTREAM (TAIL CANCEL SW)
A -- Continue to next step.

2. READ VALUE USING TECHSTREAM (RHEOSTAT VALUE)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Combination Meter / Active Test.

(e) Check the values by referring to the table below.

Combination Meter:





OK:

The value displayed on the tester gradually changes according to the rheostat operation.

NG -- CHECK HARNESS AND CONNECTOR (COMBINATION METER - LIGHT CONTROL RHEOSTAT)
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM (TAIL CANCEL SW)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Combination Meter / Data List.

(e) Check the values by referring to the table below.

Combination Meter:





OK:

Condition displayed on the tester is the same as the actual rheostat position.

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

OK -- REPLACE COMBINATION METER ASSEMBLY Removal

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

(a) Disconnect the E1 meter and D4 rheostat connectors.





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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. INSPECT LIGHT CONTROL RHEOSTAT

(a) Remove the light control rheostat with the connector still connected.





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

Standard resistance:





NG -- REPLACE LIGHT CONTROL RHEOSTAT Removal

OK -- REPLACE COMBINATION METER ASSEMBLY Removal

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

(a) Disconnect the E1 meter and D4 rheostat connectors.





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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

7. INSPECT LIGHT CONTROL RHEOSTAT

(a) Remove the light control rheostat with connector still connected.





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

Standard resistance:





NG -- REPLACE LIGHT CONTROL RHEOSTAT Removal

OK -- REPLACE COMBINATION METER ASSEMBLY Removal