Abijam was born of the daughter of Abishalom (15:2b).
Abijam began to reign over Judah in the eighteenth year of Jeroboam king of Israel and reigned three years in Jerusalem (14:31b—15:2a).
Abijam walked in all the sins of his father Rehoboam, and his heart was not perfect with Jehovah like the heart of David his forefather (v. 3).
For David's sake Jehovah gave David a lamp in Jerusalem, raising up his son after him and establishing Jerusalem. Jehovah did this because David did what was upright in the sight of Jehovah, not turning aside from anything that Jehovah had commanded him all the days of his life, except in the matter of Uriah the Hittite (vv. 4-5).
Abijam fought with Jeroboam, slept with his fathers, and was buried in the city of David (vv. 7b-8a).