Nissan Altima 2007-2012 Service Manual: How to read wiring diagrams

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.

• 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-

• For detail, refer to following GI-11, "Description".



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

A vehicle is in the “normal” condition when:

• ignition switch is “OFF”, • doors, hood and trunk lid/back door are closed, • pedals are not depressed, and • parking brake is released.


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.

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    Location of Antenna 1. In-line connectors M87, M501 2. Audio unit harness 3. Audio unit 4. Satellite antenna 5. Audio antenna feeder 6. Satellite radio antenna feeder 7. Window Antenna 8. Antenna amp. 9. Satellite radio tuner Window Antenna Repair ELEMENT CHECK 1. Attach probe circuit ...

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    Checking bulbs
    With all doors closed, apply the parking brake and place the ignition switch to the ON position without starting the engine. The following lights will come on: The following lights (if equipped) come on briefly and then go off: If any light fails to come on, it may indicate a burned-out b ...