Further strikes are planned at BMW, Audi, Daimler and Porsche.
Demands come ahead of negotiations starting March 9 for automotive and machinery workers.
Unions intend to improve wages and working conditions among German-owned automotive suppliers.
IG Metall chairman says increase is needed to strengthen domestic demand.
3.4% and 2.2% as German auto company faces tough market.
A union representing German metal workers has called on thousands of its members to begin two days of strikes over demands for better pay.
Germany’s main workers’ union says it will demand a raise of 6.5% for its more than two million members in upcoming negotiations with employers.