Nissan Altima 2007-2012 Service Manual: Body control system

System Description

OUTLINE

• BCM (body control module) controls the various electrical components. It inputs the information required to the control from CAN communication and the signal received from each switch and sensor.

• BCM has combination switch reading function for reading the operation status of combination switches (light, turn signal, wiper and washer) in addition to a function for controlling the operation of various electrical components.

It also has the signal transmission function as the passed point of signal and the power saving control function that reduces the power consumption with the ignition switch OFF.

• BCM is equipped with the diagnosis function that performs the diagnosis with CONSULT-III and various settings.

CAN communication control

In CAN communication, control units are connected with 2 communication lines (CAN-L, CAN-H) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives the data but selectively reads required information only.

CAN communication signal

Refer to the LAN-25, "CAN Communication Signal Chart".

BCM control function list

Component Parts Location

1. BCM M16, M17, M18, M19, M20, M21 (view with instrument panel removed) (coupe shown, sedan similar)

    Combination switch reading system
    System Diagram System Description OUTLINE • BCM reads the status of the combination switch (light, turn signal, wiper and washer) and recognizes the status of each switch. • BCM is a c ...

    Other materials:

    Service data and specifications (SDS)
    Steering Wheel Steering Angle Steering Column STEERING COLUMN LENGTH TILT MECHANISM OPERATING RANGE Steering Gear STEERING OUTER SOCKET AND INNER SOCKET RACK STROKE Oil Pump Steering Fluid ...

    P1801 Vias control solenoid valve 2
    Description The VIAS control solenoid valve 2 cuts the intake manifold vacuum signal for power valve 2 control. It responds to ON/OFF signals from the ECM. When the solenoid is OFF, the vacuum signal from the intake manifold is cut. When the ECM sends an ON signal the coil pulls the plunger ...

    BCM branch line circuit
    Diagnosis Procedure INSPECTION PROCEDURE 1.CHECK CONNECTOR 1. Turn the ignition switch OFF. 2. Disconnect the battery cable from the negative terminal. 3. Check the terminals and connectors of the BCM for damage, bend and loose connection (unit side and connector side). Is the inspec ...