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BODY CONTROL SYSTEM

K ELECTRICAL

SECTION
BODY CONTROL SYSTEM
BCS B

E
CONTENTS
PRECAUTIONS ......................................................... 2 . SYSTEMS CONTROLLED BY BCM, COMBINA- F
Precautions for Supplemental Restraint System TION METER AND IPDM E/R .............................. 8 .
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- MAJOR COMPONENTS AND CONTROL SYS-
SIONER" ................................................................. 2
. TEM ...................................................................... 9
. G
BCM (BODY CONTROL MODULE) .......................... 3 . CAN Communication Unit ...................................... 10 .
System Description ................................................. 3 . Schematic .............................................................. 11
.
BCM FUNCTION .................................................. 3 . CONSULT-II Function (BCM) ................................ 13 .
H
COMBINATION SWITCH READING FUNCTION 3 ..... CONSULT-II BASIC OPERATION ...................... 13 .
CAN COMMUNICATION CONTROL ................... 6 . ITEMS OF EACH PART ..................................... 14 .
BCM STATUS CONTROL .................................... 7 . WORK SUPPORT .............................................. 15 .
SYSTEMS CONTROLLED BY BCM DIRECTLY 8 ..... CAN DIAG SUPPORT MNTR ............................ 15 . I
SYSTEMS CONTROLLED BY BCM AND IPDM CAN Communication Inspection Using CONSULT-
E/R ....................................................................... 8
. II (Self-Diagnosis) .................................................. 15
.
SYSTEMS CONTROLLED BY BCM AND COM- Check BCM Power Supply and Ground Circuit ..... 16 . J
BINATION METER ............................................... 8 . Removal and Installation of BCM .......................... 17 .
SYSTEMS CONTROLLED BY BCM AND INTEL- REMOVAL .......................................................... 17.
LIGENT KEY UNIT ............................................... 8 . INSTALLATION .................................................. 17 .
BCS

Revision: 2006 January BCS-1 2006 M35/M45
PRECAUTIONS

PRECAUTIONS PFP:00001

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" NKS003XG

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING:
q To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer.
q Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.
q Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.

Revision: 2006 January BCS-2 2006 M35/M45
BCM (BODY CONTROL MODULE)

BCM (BODY CONTROL MODULE) PFP:284B2
A
System Description NKS003XH

BCM (Body Control Module) controls the operation of various electrical units installed on the vehicle.
BCM FUNCTION B
BCM has combination switch reading function for reading the operation of combination switches (light, wiper,
washer, turn signal) in addition to a function for controlling the operation of various electrical components. Also
it has an interface function allowing it to receive signals from the combination meter, and send signals to ECM C
using CAN communication.
COMBINATION SWITCH READING FUNCTION
D
Description
q BCM reads combination switch (lighting switch, wiper switch) status, and controls various electrical com-
ponent according to the result.
E
q BCM reads information of a maximum of 20 switches by combining five output terminals (OUTPUT 1-5)
and five input terminals (INPUT 1-5).
Operation Description F
q BCM activates transistors of output terminals (OUTPUT 1-5) periodically, and allows current to flow in
turn.
q If any (1 or more) switches are turned ON, circuit of output terminals (OUTPUT 1-5) and input terminals G
(INPUT 1-5) becomes active.
q At this time, transistors of output terminals (OUTPUT 1-5) are activated to allow current to flow. When volt-
age of input terminals (INPUT 1-5) corresponding to that switch changes, interface in BCM detects volt- H
age change, and BCM determines that switch is ON.

BCS

PKIC0270E

Revision: 2006 January BCS-3 2006 M35/M45
BCM (BODY CONTROL MODULE)

Operation Table of BCM and Combination Switches
BCM reads operation status of combination switch using combinations shown in table below.

PKIC0276E

NOTE:
Headlamp system has a dual switch.

Revision: 2006 January BCS-4 2006 M35/M45
BCM (BODY CONTROL MODULE)

Sample Operation:
q When lighting switch 1ST position is turned ON, contact in combination switch turns ON. At this time if A
OUTPUT 4 transistor is activated, BCM detects that voltage changes in INPUT 5.
q When OUTPUT 4 transistor is ON, BCM detects that voltage changes in INPUT 5, and judges that lighting
switch 1ST position is ON. Then BCM sends tail lamp and clearance lamp request signal to IPDM E/R B
using CAN communication.
q When OUTPUT 4 transistor is activated again, BCM detects that voltage changes in INPUT 5, and recog-
nizes that lighting switch 1ST position is continuously ON. C

PKIC0271E
I
NOTE:
Each OUTPUT terminal transistor is activated at 10 ms intervals. Therefore after switch is turned ON, electri-
cal loads are activated with time delay. But this time delay is so short that it cannot be detected by human
J
senses.

BCS

Revision: 2006 January BCS-5 2006 M35/M45
BCM (BODY CONTROL MODULE)

Operation Mode
Combination switch reading function has operation modes shown below.
1. Normal status
q When BCM is not in sleep status, OUTPUT terminals (1-5) send out ON signal every 10 ms.

2. Sleep status
q When BCM is in sleep status, transistors of OUTPUT 1 stop the output, and BCM enters low power
mode. Mean while OUTPUT 2-5 send out ON signal every 60 ms, and accept only input from lighting
switch (except turn signal switch) system.

PKIC0272E

CAN COMMUNICATION CONTROL
CAN communication allows a high rate of information transmission through the two communication lines (CAN
L line, CAN H line) connecting the various control units in the system. Each control unit transmits/receives
data but selectively reads required data only. For details of signals that are transmitted/received by BCM via
CAN communication, refer to LAN-34, "CAN Communication Unit" .

Revision: 2006 January BCS-6 2006 M35/M45
BCM (BODY CONTROL MODULE)

BCM STATUS CONTROL
BCM changes its status depending on the operation status in order to save power consumption. A
1. CAN communication status
q With ignition switch ON, CAN communicates with other control units normally.
B
q Control by BCM is being operated properly.

q When ignition switch is OFF, switching to sleep mode is possible.

q Even when ignition switch is OFF, if CAN communication with IPDM E/R and combination meter is
C
active, CAN communication status is active.
2. Sleep transient status
q This status shuts down CAN communication when ignition switch is turned OFF.
D
q It transmits sleep request signal to IPDM E/R and combination meter.

q Two seconds after CAN communication of all control units stops, sleep transient status switches to CAN
communication inactive status. E
3. CAN communication inactive status
q With ignition switch OFF, CAN communication is not active.

q With ignition switch OFF, control performed only by BCM is active. F
q Three seconds after CAN communication of all control units stops, CAN communication inactive status
switches to sleep status.
4. Sleep status G
q BCM is activated with low power mode.

q CAN communication is not active.
H
q When CAN communication operation is detected, it switches to CAN communication status.

q When a state of the following switches changes, it switches to CAN communication status.

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