Meter Illumination Is Always Dark

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

DESCRIPTION

The meter ECU receives signals from this circuit to adjust the illumination of the meter. The meter ECU sets the illumination level based on the user operation of the light control rheostat.

HINT
* The meter illumination level can be adjusted by operating the light control rheostat.
* The meter illumination dims when the light control switch is turned to the tail, head, or AUTO position at night.
* Setting the meter illumination to maximum brightness cancels the above dimming of the meter illumination.

WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
* The meter illumination can be customized by turning the light control rheostat.
* Setting the meter illumination to minimum brightness turns off the meter illumination when the light control switch is changed to the tail, head, or AUTO position at night.
The meter illumination can be customized by turning the light control rheostat.
* Before starting following inspection, check if the lighting system outputs the DTCs Reading and Clearing Diagnostic Trouble Codes.

PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

(a) Check if a CAN communication DTC is output Diagnosis System.

Result:





B -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
A -- Continue to next step.

2. READ VALUE USING TECHSTREAM (ILLUMINATION RATE INFO)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Data List.

(e) Check the values by referring to the table below.

Main Body





Result:





B -- CHECK LIGHTING SETTING Customize Parameters
A -- Continue to next step.

3. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Replace the main body ECU (multiplex network body ECU) with a new or a normal one Removal.

OK:

The operation of the combination meter assembly returns to normal.

HINT
The meter ECU controls the meter illumination based on an auto dimmer signal from the main body ECU (multiplex network body ECU). When the meter illumination is always dark (very dim), it may be due to the main body ECU (multiplex network body ECU) sending an auto dimmer signal to the meter ECU because of a malfunction in the main body ECU (multiplex network body ECU).

NG -- REPLACE COMBINATION METER ASSEMBLY Removal

OK -- END