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.

    How to follow trouble diagnoses
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    Abbreviation List The following ABBREVIATIONS are used: ...

    Other materials:

    B210a steering lock condition switch
    Description There are 2 switches in the electronic steering column lock. IPDM E/R compares those 2 switches conditions to judge the present steering status and transmit the result to BCM via CAN communication. DTC Logic DTC DETECTION LOGIC NOTE: • If DTC B210A is displayed with DTC U10 ...

    Combination switch input circuit
    Diagnosis Procedure 1. CHECK INPUT 1 - 5 SYSTEM CIRCUIT FOR OPEN 1. Turn the ignition switch OFF. 2. Disconnect the BCM and combination switch. 3. Check continuity between BCM harness connector and combination switch harness connector. Does continuity exist? YES >> GO TO 2 NO ...

    On-vehicle repair
    TRANSMISSION CONTROL MODULE Exploded View 1. TCM 2. Bracket 3. Battery Removal and Installation REMOVAL 1. Disconnect the battery negative terminal. Refer to PG-139, "Removal and Installation". 2. Remove the fresh air intake tube (upper) EM-25, "Removal and Installat ...