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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:

Installation
1. INSTALL LOWER BALL JOINT ASSEMBLY FRONT LH (a) Install the lower ball joint assembly front LH and tighten the nut. Torque: 123 N*m (1,250 kgf*cm, 91 ft.*lbf) (b) Install a new cotter pin. NOTICE: If the holes for the cotter pin are not aligned, tighten the nut further up to 60°. 2. INS ...

Using the mechanical key (vehicles with a smart key system)
To take out the mechanical key, push the release button and take the key out. The mechanical key can only be inserted in one direction, as the key only has grooves on one side. If the key cannot be inserted in a lock cylinder, turn it over and reattempt to insert it. After using t ...

Operation check
1. REMOVE CHECK FUNCTION  Check that the key reminder warning buzzer sounds.  With the driver side door closed, insert the key into the ignition key cylinder and then turn the key to LOCK or ACC.  Check that the buzzer sounds intermittently if the driver side door ...

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