Nissan Sentra Service Manual: How to read wiring diagrams

Key to Symbols Signifying Measurements or Procedures

...

Connector symbols

Most of connector symbols in wiring diagrams are shown from the terminal side. Connector symbols shown from the terminal side are enclosed by a single line and followed by the direction mark. ...

Other materials:

Ecm branch line circuit
Diagnosis procedure 1.Check connector Turn the ignition switch off. Disconnect the battery cable from the negative terminal. Check the terminals and connectors of the ecm for damage, bend and loose connection (unit side and connector side). Is the inspection result normal? Yes > ...

Optical sensor
Description The optical sensor measures ambient light and transmits the optical sensor signal to the bcm. Component function check 1.Check optical sensor signal by consult Consult Turn the ignition switch ON. Select opti sen of bcm (head lamp) data monitor item. Turn the lighting swit ...

Slip indicator lamp
Component Function Check 1.CHECK SLIP INDICATOR LAMP FUNCTION Check that slip indicator lamp in combination meter turns ON for approximately 2 seconds after ignition switch is turned ON. Is the inspection result normal? YES >> Inspection End. NO >> Proceed to diagnosis proce ...