2. Kohanim attending a funeral/burial of non-seven relatives:

Memorial service:[1] It is forbidden for a Kohen to attend a memorial service that is taking place indoors, if the body is found in the room. It is permitted for him to attend an outdoors service, so long as he remains at least a four Amos [196 cm] distance from the body and does not stand under any item hovering over the deceased.

Funeral procession: It is permitted for a Kohen to attend a funeral procession so long as he remains at least a four Amos [196 cm] distance from the deceased.[2] In addition, he must beware not to walk under any item that hovers over the deceased.[3]

Entering the cemetery:[4] It is forbidden for a Kohen to enter a cemetery unless he remains at least a four Amos distance from any graves, or walks around with a surrounding wall like structure that is at least 10 Tefachim high, in which case he must only distance himself 4 Tefachim [32 cm] from the graves.[5] In addition, he must beware not to walk under any item that hovers over the graves.[6] If the above conditions are adhered to, then he may enter even into a gated cemetery.

Car:[7] A Kohen who remains in his car is protected from any impurity, and he may thus enter the cemetery grounds in his car and remain inside it throughout the burial.

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[1] Michaber 369:1; 371:1 in greater detail

[2] Michaber 371:5; See above Halacha 1

[3] Michaber 369:1; 371:1 in greater detail

[4] See Nitei Gavriel 130:20

[5] Michaber 371:5

[6] Michaber 369:1; 371:1 in greater detail

[7] Igros Kodesh 6:348, printed in Shulchan Menachem 5:331