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

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE OF TECHSTREAM (RHEOSTAT VALUE)
(a) Connect Techstream to the DLC3.
(b) Ignition switch on (IG).
(c) Turn the tester 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 as the actual rheostat operation.
NG -- INSPECT LIGHT CONTROL RHEOSTAT
OK -- Continue to next step.
2. CHECK ILLUMINATION
OK:






B -- REPLACE BODY ECU
C -- INSPECT COMBINATION METER ASSEMBLY
A -- REPLACE COMBINATION METER ASSEMBLY
3. REPLACE BODY ECU
HINT: Check illumination circuit before replacing body ECU
Symptom Related Diagnostic Procedures.

OK:
Operation of the light control rheostat returns to normal.
NG -- REPLACE COMBINATION METER ASSEMBLY
OK -- END
4. INSPECT COMBINATION METER ASSEMBLY





(a) Disconnect the E2 connector.
(b) Measure the voltage according to the value(s) in the table below.
Voltage:






NG -- REPLACE COMBINATION METER ASSEMBLY
OK -- CHECK ILLUMINATION
5. INSPECT LIGHT CONTROL RHEOSTAT





(a) Remove the light control rheostat.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






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





(a) Disconnect the E1 and E2 connectors.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE COMBINATION METER ASSEMBLY