"We suggested holding negotiations next Monday, but there has been no answer yet," Alexei Etmanov said.
Around 1,000 workers at the factory halted production on November 20 demanding a 30% pay rise. However, on November 28, some 600-700 workers crossed the picket line and production was partially resumed.
Earlier this week Etmanov said that workers were planning to hold a number of rallies and demonstrations in St. Petersburg and the surrounding Leningrad Region, as talks on a pay raise had failed to produce results.
A previous dispute between management and employees was resolved after a one-day strike in March 2007, when the plant's administration made concessions, concluding a new collective labor contract providing higher wages and increased employment benefits.
Average wages at the U.S. auto giant's sole Russian plant are about 21,000 rubles ($860) a month.