Nissan Altima (L32) 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:
C1729 vehicle speed signal
Description
The vehicle speed signal is not being detected by the BCM.
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.CHECK SELF-DIAGNOSTIC RESULTS
1. On SELECT DIAG MODE, select the SELF-DIAG RESULT screen.
2. Check display contents on SELF DIAG RESULT screen.
Is the CAN C ...
P0447 evap canister vent control
valve
Description
The EVAP canister vent control valve is located on the EVAP canister
and is used to seal the canister vent.
This solenoid valve responds to signals from the ECM. When the
ECM sends an ON signal, the coil in the solenoid valve is energized.
A plunger will then move to seal the c ...
Engine coolant
Changing Engine Coolant
WARNING:
• To avoid being scalded, never change the coolant when the engine is hot.
• Wrap a thick cloth around cap and carefully remove the cap. First, turn the
cap a quarter of a turn to
release built-up pressure. Then push down and turn the cap all the way to
...
