1. Disconnect the negative battery cable..
2. Remove the outer mirror glass..
3. Remove the outer mirror garnish..
4. Remove the screw.

5. Disconnect the connector.
6. Remove the side turn light while detaching tab.
CAUTION:
If the tabs of the side turn light are detached, the side turn light may fall off and be damaged. When detaching the tabs of the side turn light, hold the side turn light with a hand during the servicing.
7. Install in the reverse order of removal.
Side Turn Light Inspection
Vanity Mirror Illumination InspectionAir Fuel Ratio (A/F) Sensor Inspection [Mzr 2.0, Mzr 2.5]
A/F Sensor Inspection
1. Connect the M-MDS to the DLC-2.
2. Switch the ignition to ON.
3. Warm up the engine to normal operating temperature.
4. Access the following PIDs using the M-MDS..
VSS (Vehicle speed)
RPM (Engine speed)
O2S11 (A/F sensor output current)
...
ABS HU/CM Inspection
1. Disconnect the ABS HU/CM connector..
2. Connect the negative battery cable..
3. Attach the tester lead to the ABS HU/CM wiring harness-side connector and
inspect the voltage, continuity, or resistance according to the standard (reference
value) in the table below.
Standard (reference)
...
PKSB (Parking Support Brake)
The Subaru Solterra PKSB (Parking Support Brake) system is engineered
to assist the driver during low-speed maneuvers, such as parking, by issuing warnings
and automatically applying braking force to help reduce potential collision damage
with detected obstacles.
PKSB (Parking Support Brake) ...