Infiniti G35 (V35). Manual — part 150
BCM (BODY CONTROL MODULE)
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BCM (BODY CONTROL MODULE)
PFP:284B2
System Description
NKS000MZ
BCM (Body Control Module) controls the operation of various electrical units installed on the vehicle.
BCM FUNCTION
BCM has combination switch reading function for reading the operation of combination switches (light, wiper,
washer and 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 display and A/C auto amp., and send
signals to ECM using CAN communication.
COMBINATION SWITCH READING FUNCTION
Description
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BCM reads combination switch (lighting switch, wiper switch) status, and controls various electrical com-
ponent, according to the results.
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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
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BCM activates transistors of output terminals (OUTPUT 1-5) periodically, and allows current to flow in
turn.
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If any (1 or more) switches are turned ON, circuit of output terminals (OUTPUT 1-5) and input terminals
(INPUT 1-5) becomes active.
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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-
age change, and BCM determines that switch is ON.
PKIC6010E
BCS-4
BCM (BODY CONTROL MODULE)
Operation table of BCM and combination switches
BCM reads operation status of combination switch using combinations shown in table below.
NOTE:
Headlamp system has a dual switch.
SKIA8640E
BCM (BODY CONTROL MODULE)
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Sample operation: (When lighting switch 1ST position turned ON)
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When lighting switch 1ST position is turned ON, contact in combination switch turns ON. At this time if
OUTPUT 4 transistor is activated, BCM detects that voltage changes in INPUT 5.
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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
using CAN communication.
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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.
NOTE:
Each OUTPUT terminal transistor is activated at 10 ms intervals. Therefore after switch is turned ON,
electrical loads are activated with a time delay. But this time delay is so short that it cannot be detected by
human senses.
PKIC6036E
BCS-6
BCM (BODY CONTROL MODULE)
Operation mode
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Combination switch reading function has operation modes shown below.
1.
Normal status
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When BCM is not in sleep status, OUTPUT terminals (1-5) send out ON signal every 10 ms.
2.
Sleep status
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When BCM is in sleep status, transistors of OUTPUT 1 and 5 stop the output, and BCM enters low
power mode. Mean while OUTPUT 2, 3, and 4 send out ON signal every 60 ms, and accept only input
from light switch system.
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-47, "CAN System Specification Chart"
.
PKIC4919E
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