Operating Light Control RHeostat Does Not Change Light Brightness

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

DESCRIPTION

When the light control rheostat knob is turned to the left, the combination meter and vehicle interior illumination will dim. When the light control rheostat knob is turned to the right, the combination meter and vehicle illumination will become brighter.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (LIGHT CONTROL RHEOSTAT)

(a) Operate the Techstream according to the display and select the Data List Scan Tool Testing and Procedures.

Combination Meter





OK:

Light brightness can be changed within specified range by manual operation.

NG -- REPLACE COMBINATION METER ASSEMBLY Removal
OK -- Continue to next step.

2. INSPECT LIGHT CONTROL RHEOSTAT

(a) Inspect the light control rheostat.





(1) Remove the light control rheostat Removal.

(2) Measure the resistance according to the table below.

Standard Resistance:





(b) Inspect the ODO/TRIP switch.

(1) Measure the resistance according to the table below.

Standard Resistance:





NG -- REPLACE LIGHT CONTROL RHEOSTAT Removal
OK -- Continue to next step.

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





(a) Disconnect the E77 meter connector.

(b) Disconnect the E9 rheostat connector.

(c) 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.

4. REPLACE COMBINATION METER ASSEMBLY

(a) Replace the combination meter assembly with a new or normally operating one. Perform an operation inspection.

OK:

Combination meter assembly operates normally.

NG -- Go to LIGHTING SYSTEM Service Precautions

OK -- END (COMBINATION METER IS DEFECTIVE)