1. Disconnect the negative battery cable..
2. Remove the sunvisor..
3. Verify that the continuity between the vanity mirror illumination terminals is as indicated in the table.

If not as indicated in the table, inspect the bulb. If there is no malfunction, replace the sunvisor.

Vanity Mirror Illumination Bulb Removal/Installation
Power Outer Mirror Switch InspectionGauges and meters
In the Subaru Solterra, the gauges and meters are designed to provide
the driver with clear, real-time driving information, helping to maintain awareness
of vehicle performance, battery condition, and overall system status during every
journey.
Meter display
■ Locations of gauges and meter ...
Fan Switch Inspection [Manual Air Conditioner]
1. Disconnect the negative battery cable..
2. Remove the following parts:
a. Upper panel.
b. Shift lever knob (MTX).
c. Selector lever knob (ATX).
d. Shift panel.
e. Side wall.
f. Console.
g. Front scuff plate.
h. Front side trim.
i. Dashboard under cover.
j. Glove compartment. ...
Drive Belt Auto Tensioner Inspection [Mzr 2.3 Disi Turbo]
1. Remove the aerodynamic under cover No.2 and splash shield as a single unit..
2. Remove the drive belt..
3. Verify that the drive belt auto tensioner moves smoothly in the operational
direction.
Replace the drive belt auto tensioner if necessary..
4. Rotate the drive belt ...