From Ross-Tech Wiki

18010/P1602/005634 - Power Supply B+ Terminal 30: Voltage too Low

Possible Causes

  • Cables on the Battery were removed
  • Battery weak (voltage)
  • Generator Malfunction

Possible Solutions

  • Check Battery Cables
  • Check/Replace Battery
  • Check/Replace Generator

Special Notes

  • If multiple Control Module have Power Supply Faults stored, it's most likely to be one common Problem like the ones shown above. Otherwise when only one or two Control Modules have such Codes stored you better start searching at the individual Power Supply of these Modules.
  • Terminal 30 means unswitched battery power that is supplied even when the ignition is off. This is not referring to any physical terminal numbered 30.