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Toyota Sienna Service Manual: Operating Light Control Rheostat does not Change Light Brightness

Toyota Sienna Service Manual / Meter / Meter / gauge system / On-vehicle inspection / Operating Light Control Rheostat does not Change Light Brightness

DESCRIPTION

The meter CPU receives signals for adjusting illumination on the meter from this circuit. The meter CPU detects the illumination level selected by the user according to the position of the rheostat knob.

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 READ VALUE OF INTELLIGENT TESTER (LIGHT RHEOSTAT)

  1. Connect the intelligent tester to the DLC3.
  2.  Turn the switch to the ON position.
  3.  Turn the tester ON.
  4.  Enter the following menus: DIAGNOSIS / OBD/MOBD / METER / DATA LIST.
  5.  Check the values by referring to the table below.

METER:

METER

OK: Light brightness displayed on the tester is almost the same as the actual light brightness.

REPLACE COMBINATION METER ASSEMBLY

2 CHECK HARNESS AND CONNECTOR (LIGHT CONTROL RHEOSTAT CIRCUIT)

CHECK HARNESS AND CONNECTOR (LIGHT CONTROL RHEOSTAT CIRCUIT)

  1. Disconnect the C10 connectors.
  2. Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

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

Standard voltage

Standard voltage

REPLACE COMBINATION METER ASSEMBLY

Driver Side Seat Belt Warning Light does not Operate
DESCRIPTION When turning the ignition switch to the ON position, the combination meter assembly communicates with the supplemental restraint system by the multiplex communication system. Unless ...

Meter Illumination is Always Dark
DESCRIPTION  Confirm that the vehicle is equipped with the optitron meter, then check this circuit. The combination meter assembly receives a auto dimmer signal from the body ECU by t ...

Other materials:

Power slide door touch sensor
INSPECTION 1. INSPECT POWER SLIDE DOOR TOUCH SENSOR LH Check the resistance of the sensor. Resistance If the result is not as specified, replace the sensor. 2. INSPECT POWER SLIDE DOOR TOUCH SENSOR RH Check the resistance of the sensor. Resistance If the result is not a ...

Disassembly
1. REMOVE NO. 1 HEADLIGHT BULB (HALOGEN HEADLIGHT)  Turn in the direction indicated by the arrow and remove the No. 1 headlight bulb. 2. REMOVE DISCHARGE HEADLIGHT BULB (DISCHARGE HEADLIGHT) Turn in the direction indicated by the arrow and disconnect the socket. ...

Taking out the jack and tools
Remove the cover. Remove the adapter socket. Remove the jack. Remove the wheel nut wrench. ...

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