Basic Inspection 2: Inspection For Looseness Of Power System Terminals
WARNING: This page is about a different car, the 2005 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.
Check battery for looseness on battery positive/negative terminals and ground connection. If looseness is detected, fasten the connections to the specified torque. Make sure battery voltage does not drop and alternator is normal.