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Nissan Sentra B18 (2020-2025) Service Manual: How to Read Wiring Diagrams

Connector Symbols

Connector symbols

Most of the 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.

  • Connector symbols shown from the harness side are enclosed by a double line and followed by the direction mark.

  • Certain systems and components, especially those related to OBD, may use a new style slide-locking type harness connector. For description and how to disconnect, refer to PG section, “Description”, “HARNESS CONNECTOR”.

  • Male and female terminals

    Connector guides for male terminals are shown in black and female terminals in white in wiring diagrams.

Sample/wiring Diagram -Example-

Sample/wiring diagram -example-

Each section includes wiring diagrams.

Description

No.

Item

Description

1

Power supply

  • This means the power supply of fusible link or fuse.

2

Fuse

  • “/” means the fuse.

3

Current rating of fusible link/fuse

  • This means the current rating of the fusible link or fuse.

4

Number of fusible link/fuse

  • This means the number of fusible link or fuse location.

5

Fusible link

  • “X” means the fusible link.

6

Connector number

  • Alphabetic characters show to which harness the connector is placed.

  • Numeric characters show the identification number of connectors.

7

Switch

  • This shows that continuity exists between terminals 1 and 2 when the switch is in the A position. Continuity exists between terminals 1 and 3 when the switch is in the B position.

8

Circuit (Wiring)

  • This means the wiring.

9

Shielded line

  • The line enclosed by broken line circle shows shield wire.

10

Connectors

  • This means that a transmission line bypasses two connectors or more.

11

Option abbreviation

  • This means the Nissan Sentra vehicle specifications which lays out the circuit between “”.

12

Relay

  • This shows an internal representation of the relay.

13

Optional splice

  • The open circle shows that the splice is optional depending on Nissan Sentra vehicle application.

14

Splice

  • The shaded circle “” means the splice.

15

System branch

  • This shows that the circuit is branched to other systems.

16

Page crossing

  • This circuit continues to an adjacent page.

17

Component name

  • This shows the name of a component.

18

Terminal number

  • This means the terminal number of a connector.

19

Ground (GND)

  • This shows the ground connection.

20

Explanation of option description

  • This shows an explanation of the option abbreviation used on the same page.

SWITCH POSITIONS

Switches are shown in wiring diagrams as if the Nissan Sentra vehicle is in the “normal” condition.

A vehicle is in the “normal” condition when:

  • Ignition switch OFF

  • Doors, hood and trunk lid/back door are closed

  • Pedals are not depressed

  • Parking brake is released

MULTIPLE SWITCH

The continuity of multiple switch is described in two ways as shown below.

  • The switch chart is used in schematic diagrams.

  • The switch diagram is used in wiring diagrams.

Connector Information

Connector Information

Description

No.

Item

Description

1

Connector number

  • Alphabetic characters show to which harness the connector is placed.

  • Numeric characters show the identification number of connectors.

2

Connector type

: Connector model

: Cavity

: Male (M) and female (F) terminals

: Connector color

: Special type

3

Connector color

  • This means the color of a connector.

4

Terminal number

  • This means the terminal number of a connector.

5

Wire color

  • This shows a code for the color of the wire.

B = Black

W = White

R = Red

G = Green

L = Blue

Y = Yellow

LG = Light Green

BG or BE = Beige

BR = Brown

LA = Lavender

OR or O = Orange

P = Pink

PU or V (Violet) = Purple

GY or GR = Gray

SB = Sky Blue

CH = Dark Brown

DG = Dark Green

  • When the wire color is striped, the base color is given first followed by the stripe color as shown below:

    Example: L/W = Blue with White Stripe

6

Connector

  • This means the connector information.

  • This unit-side is described by the connector symbols.
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