Nissan Maxima Service and Repair Manual: Body control system

System Description

OUTLINE

• ECU DIAGNOSIS INFORMATION 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 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

BCM control function list

Component Parts Location

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