Check "S" Terminal Circuit

WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK "S" TERMINAL CONNECTION
Check to see if "S" terminal is clean and tight.

OK or NG
1. OK: GO TO 2.
2. NG: Repair "S" terminal connection. Confirm repair by performing complete Battery/Starting/Charging system test.
CHECK GENERATOR "S" TERMINAL CIRCUIT
Check voltage between generator connector F1 terminal S (Y/B) and ground using a digital circuit tester.

Battery voltage should exist.

OK or NG
1. OK: GO TO 3.
2. NG: Check the following.
  - 10A fuse (No. 26, located in fuse and fusible link box)
  - Harness for open or short between generator and fuse
    
    Fig 1: Measuring Voltage Between Generator Connector F1 Terminal S (Y/B) And Ground
    Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK "S" TERMINAL CONNECTION QUALITY (VOLTAGE DROP TEST)
Check voltage between generator connector F1 terminal S (Y/B) and battery positive terminal using a digital tester.

With engine running at idle and warm: Less than 0.2V

OK or NG
1. OK: Replace the generator. Confirm repair by performing complete Battery/Starting/Charging system test.
2. NG: Check harness between the battery and the generator for poor continuity.
  
  Fig 2: Measuring Voltage Between Generator Connector F1 Terminal S (Y/B) And Battery
  Courtesy of NISSAN MOTOR CO., U.S.A.