Operating Light Control Rheostat does not Change Light Brightness: Procedure
- READ VALUE USING TECHSTREAM (LIGHT CONTROL RHEOSTAT)
- Connect the Techstream to the DLC3.
- Turn the ignition switch to the ON position.
- Turn the Techstream on.
- Enter the following menus: Body Electrical / Combination Meter / Active Test.
- Check the values by referring to the table below.COMBINATION METER:
Tester Display Measurement Item/Range Normal Condition Diagnostic Note Light Control Rheostat Light control rheostat/Min.: 0%, Max.: 100% Light control rheostat switch is Dark (0%) → Bright (100%) - OK
Light brightness can be changed within the specified range by actual operation.
NG → See step 2
OK → REPLACE COMBINATION METER ASSEMBLY
- INSPECT LIGHT CONTROL RHEOSTAT
- Remove the light control rheostat.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
Tester Connection Condition Specified Condition R6-1 (E) - R6-7 (RV) Rheostat knob is in the MAX. position. 8 to 12 kΩ R6-1 (E) - R6-6 (TC) Always 8 to 12 kΩ R6-1 (E) - R6-7 (RV) Rheostat knob is in the MIN. position. Approx. 0 Ω R6-5 (T) - R6-6 (TC) Rheostat knob is in the MAX. position. Approx. 0 Ω R6-5 (T) - R6-6 (TC) Rheostat knob is in the MIN. position. 10 kΩ or higher
NG → REPLACE LIGHT CONTROL RHEOSTAT
OK: Go to next step
- CHECK HARNESS AND CONNECTOR (COMBINATION METER - LIGHT CONTROL RHEOSTAT)
- Disconnect the C9 and R6 connectors.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
Tester Connection Condition Specified Condition C9-13 (RE) - R6-1 (E) Always Below 1 Ω C9-14 (RV) - R6-7 (RV) Always Below 1 Ω C9-15 (RL) - R6-5 (T) Always Below 1 Ω C9-16 (TCAN SW) - R6-6 (TC) Always Below 1 Ω R6-1 (E) - Body ground Always 10 kΩ or higher R6-5 (T) - Body ground Always 10 kΩ or higher R6-6 (TC) - Body ground Always 10 kΩ or higher R6-7 (RV) - Body ground Always 10 kΩ or higher
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK → REPLACE COMBINATION METER ASSEMBLY