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
The meter ECU (meter circuit plate No.3) receives signals from this circuit to adjust the illumination of the meter, and instrument panel. The meter ECU (meter circuit plate No.3) sets the illumination level based on the user operation of the light control rheostat.
HINT
* The meter illumination level can be adjusted by operating the light control rheostat.
* The meter illumination dims when the light control switch is turned to the tail or head position at night.
* Setting the meter illumination to maximum brightness cancels the above dimming of the meter illumination.
* Setting the meter illumination to minimum brightness turns off the meter illumination when the light control switch is changed to the tail or head position.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. SYSTEM CHECK
(a) Confirm the symptoms.
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 power switch on (IG).
(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:
The value displayed on the Techstream gradually changes as the actual rheostat knob operation.
NG -- INSPECT 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 power switch on (IG).
(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
HINT
The tail cancel switch is operated by turning the light control rheostat knob fully upward
OK:
Condition displayed on the Techstream is the same as the actual light control rheostat knob position.
NG -- INSPECT LIGHT CONTROL RHEOSTAT
OK -- REPLACE COMBINATION METER ASSEMBLY (NO. 3 METER CIRCUIT PLATE) Disassembly
4. INSPECT LIGHT CONTROL RHEOSTAT
(a) Remove the light control rheostat.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPLACE LIGHT CONTROL RHEOSTAT Removal
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (NO. 3 METER CIRCUIT PLATE - LIGHT CONTROL RHEOSTAT)
(a) Disconnect the L27 and L59 connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE COMBINATION METER ASSEMBLY (NO. 3 METER CIRCUIT PLATE) Disassembly
6. READ VALUE USING TECHSTREAM (TAIL CANCEL SW)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(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
HINT
The tail cancel switch is operated by turning the light control rheostat knob fully upward
OK:
Condition displayed on the Techstream is the same as the actual light control rheostat knob position.
NG -- INSPECT LIGHT CONTROL RHEOSTAT
OK -- Continue to next step.
7. INSPECT LIGHT CONTROL RHEOSTAT
(a) Remove the light control rheostat.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPLACE LIGHT CONTROL RHEOSTAT Removal
OK -- Continue to next step.
8. CHECK HARNESS AND CONNECTOR (NO. 3 METER CIRCUIT PLATE - LIGHT CONTROL RHEOSTAT)
(a) Disconnect the L27 and L59 connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE COMBINATION METER ASSEMBLY (NO. 3 METER CIRCUIT PLATE) Disassembly