Toyota Sienna Service Manual: Meter Illumination is Always Dark

Toyota Sienna Service Manual / Meter / Meter / gauge system / On-vehicle inspection / 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 the multiplex communication line.

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK MULTIPLEX COMMUNICATION SYSTEM

Check if MULTIPLEX communication DTC is output

Result

Result

2 CHECK DTC

Check if DTC B1244 is output

Result

Result

3 PERFORM ACTIVE TEST BY INTELLIGENT TESTER

Operate the intelligent tester according to the steps on the display and select "DATA LIST".

MAIN BODY:

MAIN BODY

OK: The meter illumination is dimmed when the DIMMER SIG is ON.

CHECK LIGHTING SETTING

4 REPLACE COMBINATION METER ASSEMBLY

OK: The operation of the combination meter assembly returns to normal.

END

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 ...

Meter Illumination does not Dim at Night

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 EC ...

Other materials:

Removal
1. REMOVE FRONT DOOR WINDOW FRAME MOULDING Remove the screw. Using a heat light, heat the front door window frame moulding between 40 to 60 C (104 to 140 F). NOTICE: Do not heat the front door window frame moulding excessively. Slide the front door window frame moulding upward ...

Installation
1. INSTALL STEERING PAD Support the steering pad with one hand as shown in the illustration. Connect the 2 connectors to the steering pad. NOTICE: When handling the airbag connector, take care not to damage the airbag wire harness. Connect the horn connector. ...

Adjustment procedure
Hold the steering wheel and push the lever down. Adjust to the ideal position by moving the steering wheel horizontally and vertically. After adjustment, pull the lever up to secure the steering wheel. ...