Chief Executive Makoto Uchida said turnaround plan is in place, with details to be released in May.
Ghosn and another board member Greg Kelly were formally charged last week with falsifying financial reports.
Japanese media and some analysts have raised the possibility that the charges against Carlos Ghosn were engineered to sideline him.
Ghosn and fellow Nissan executive Greg Kelly were charged Dec. 10.
Allegations also concern a representative director, unreported income combined is $44 million.
Investing $2.2 billion, will share platforms, purchasing and technology.
Japanese automaker has recovered from disasters, but the global economy is highly uncertain.