Meter Illumination Is Always Dark

METER: METER / GAUGE SYSTEM: Meter Illumination is Always Dark
- 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





INSPECTION PROCEDURE

PROCEDURE

1. CHECK MULTIPLEX COMMUNICATION SYSTEM

(a) Check if MULTIPLEX communication DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result:





NG -- REPLACE CIRCUITS INDICATED BY OUTPUT DTCS
OK -- Continue to next step.

2. CHECK DTC

(a) Check if DTC B1244 is output Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- GO TO LIGHTING SYSTEM
A -- Continue to next step.

3. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Operate Techstream according to the steps on the display and select "Data List".

Main Body:





OK:

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

NG -- REPLACE COMBINATION METER ASSEMBLY

OK -- CHECK LIGHTING SETTING

4. REPLACE COMBINATION METER ASSEMBLY

OK:

The operation of the combination meter assembly returns to normal.

NG -- REPLACE BODY ECU

OK -- END