Side Gear Backlash
WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
Using a dial gauge, check the backlash of side gear.
Side gear backlash:
0.10 - 0.20 mm (0.004 - 0.008 in)
If the side gear backlash is not within the specification, select the side gear thrust washer and adjust the side gear backlash.