Lyon were pushing for a return to winning ways in the league after they drew 1-1 with Montpellier before the winter break.
Pablo Chavarría handed the visitors a surprise lead in the 34th minute with his fourth league goal of the campaign.
However, Lyon secured a point thanks to a strike from Burkina Faso international Bertrand Traore with 20 minutes remaining.
Rayo Vallecano 3-2 Celta Vigo
Rayo Vallecano boosted their survival hopes with a 3-2 win over Celta Vigo on Friday evening.
Raúl de Tomás broke the deadlock for the hosts, before Nestor Araijo and Maximiliano Gomez hit back for Celta inside the opening 20 minutes.
However, it was to be De Tomas' day as he netted two more goals (37th and 77th minute) to seal the win and his hat-trick.