The north African territory is controlled by Morocco and claimed by Polisario Front separatists backed by Algeria.
Rights groups had pressed the United Nations to task the peacekeepers of the UN Mission in the Western Sahara, MINURSO, with human rights monitoring -- a move fiercely opposed by Morocco.
The Security Council extended the mission's mandate, which began in 1991 and was due to expire at the end of the month, for a year without changes.
It also called on the parties to "cooperate fully" with MINURSO operations and to continue to negotiate on the region's status without conditions.
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Unlike last year, the measure did not involve diplomatic arm wrestling between Washington and Rabat.
But Morocco's King Mohammed VII did intervene with UN Secretary General Ban Ki-moon and the Moroccan ambassador to the United Nations was replaced during negotiations on the resolution.
In an early report, Ban had suggested that a "mechanism" be put in place to allow the US mission to monitor human rights in Western Sahara while the political process remains at a standstill.