System Description

WARNING: This page is about a different car, the 2018 Infiniti Q60. However, it is still accessible from the selected car via links, so may be relevant.

"B" terminal circuit supplies power to charge the battery and to operate the vehicle's electrical system.
"L" terminal circuit controls the charge warning lamp. The charge warning lamp illuminates when the ignition switch is set to ON or START. When the alternator is providing sufficient voltage with the engine running, the charge warning lamp will go off. If the charge warning lamp illuminates with the engine running, a malfunction is indicated.
Refer to Charge Warning Lamp (VR30DDTT Models) .
"S" terminal circuit detects the battery voltage to adjust the alternator output voltage with the IC voltage regulator.