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. CHECK TAILLIGHT
(a) Check that the taillight comes on when the ignition switch is turned to the ON position and light control switch is in the TAIL or HEAD position.
OK:
Taillight comes on.

NG -- GO TO LIGHTING SYSTEM
OK -- Continue to next step.

2. CHECK ILLUMINATION
(a) Check that the illumination of the radio and player, center cluster module switch, etc. can be adjusted by the light control rheostat switch.
OK:
The illumination can be adjusted.

NG -- INSPECT LIGHT CONTROL RHEOSTAT (POWER SOURCE)
OK -- Continue to next step.

3. INSPECT COMBINATION METER ASSEMBLY

(a) Disconnect the C10 connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:

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

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

(a) Disconnect the R13 and C10 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 connector still connected.

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

OK :

HINT: Duty ratio changes as the illumination becomes darker (period "A" shown in the illustration becomes longer).

NG -- REPLACE LIGHT CONTROL RHEOSTAT
OK -- REPLACE COMBINATION METER ASSEMBLY
6. INSPECT LIGHT CONTROL RHEOSTAT (POWER SOURCE)

(a) Disconnect the R13 connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:

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