Acts as one of several non-catalytic accessory components of the cytoplasmic dynein 2 complex (dynein-2 complex), a motor protein complex that drives the movement of cargos along microtubules within cilia and flagella in concert with the intraflagellar transport (IFT) system (PubMed:25205765, PubMed:29742051). DYNC2I2 plays a major role in retrograde ciliary protein trafficking and in ciliogenesis (PubMed:30649997, PubMed:29742051, PubMed:30320547). Required also to maintain a functional transition zone (PubMed:30320547). Acts as a negative regulator of the Toll-like and IL-1R receptor signaling pathways. Inhibits the MAP3K7-induced NF-kappa-B activation pathway. Inhibits MAP3K7 phosphorylation at 'Thr-184' and 'Thr-187' upon Il-1 beta stimulation. The cytoplasmic dynein 2 complex consists of two catalytic heavy chains (HCs) and a number of non-catalytic subunits presented by intermediate chains (ICs), light intermediate chains (LICs) and light chains (LCs). Among them, a heavy chain (DYNC2H1), two intermediate chains (DYNC2I2 and DYNC2I1), a light intermediate chain (DYNC2LI1), and a light chain (DYNLT2B) are unique to the cytoplasmic dynein complex 2, but a subset of the light chains are also shared by dynein-1 and dynein-2 complexes (PubMed:25205765, PubMed:31451806). Interacts with DYNC2I1; their C-terminal domains each bind a copy of the heavy chain, and their extended N-terminal regions are held together by an array of light chain dimers (PubMed:29742051, PubMed:31451806). Interacts with DYNLL2; this interaction is essential for dynein-2-mediated retrograde trafficking of ciliary proteins (PubMed:30649997). Interacts with DYNLRB1; this interaction is essential for dynein-2-mediated retrograde trafficking of ciliary proteins (PubMed:30649997). Interacts (via the WD domains) with MAP3K7 and TAB3. Interacts (via WD domains) with TAB2 (via C-terminus). Interacts (via WD domains) with TRAF6 (via TRAF-type domains) (PubMed:19521662). Concentrates around the centrioles and basal bodies also showing axonemal staining. Expressed in several cell lines (at protein level). The disease is caused by variants affecting the gene represented in this entry. Belongs to the dynein light intermediate chain family.