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Revision: 2006 November2007 350Z
BCM (BODY CONTROL MODULE)PFP:284B2
System DescriptionNKS0009N
BCM (Body Control Module) controls the operation of various electrical units installed in 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 unified meter and A/C amp., and send
signals to ECM using CAN communication.
COMBINATION SWITCH READING FUNCTION
Description
BCM reads combination switch (lighting switch, wiper switch) status, and controls various electrical com-
ponent, according to the results.
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
BCM activates transistors of output terminals (OUTPUT 1 - 5) periodically and, allows current to flow in
turn.
If any (1 or more) switches are turned ON, circuit of output terminals (OUTPUT 1 - 5) and input terminals
(INPUT 1 - 5) becomes active.
At this time, transistors of output terminals (OUTPUT 1 - 5) are activated to allow current to flow. When
voltage of input terminals (INPUT 1 - 5) corresponding to that switch changes, interface in BCM detects
voltage change, and BCM determines that switch is ON.
PKIC4861E
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BCM (BODY CONTROL MODULE)
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Sample Operation (When lighting switch 1ST position is turned ON)
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.
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 lighting switch (1ST position) ON signal to IPDM E/R using
CAN communication.
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 time delay. But this time delay is so short that it cannot be detected by
human senses.
SKIB7456E
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CONSULT-III Function (BCM)NKS0009R
CONSULT-III can display each diagnostic item using the diagnostic test mode shown following.
ITEMS OF EACH PART
NOTE:
CONSULT-III displays systems equipped in the vehicle.
×: Applicable
NOTE:
This item is displayed, but should not be used.BCM diagnostic test item Check item, diagnostic test mode Content
Inspection by partWORK SUPPORT Changes setting of each function.
SELF-DIAG RESULTS BCM performs self-diagnosis of CAN communication.
DATA MONITOR Displays the input data of BCM in real time.
ACTIVE TEST Gives a drive signal to a load to check the operation.
CAN DIAG SUPPORT MNTRThe result of transmit/receive diagnosis of CAN com-
munication can be read.
ECU PART NUMBER BCM part number can be read.
System and item CONSULT-III displayDiagnostic test mode (Inspection by part)
WORK
SUPPORTSELF−
DIAG
RESULTSDATA
MONI-
TORCAN
DIAG
SUP-
PORT
MNTRACTIVE
TESTECU
PA RT
NUM-
BERCON-
FIGU-
RATION
BCM BCM×× × ×
×
NOTE
Power door lock system DOOR LOCK×××
Rear window defogger REAR DEFOGGER××
Warning chime BUZZER××
Room lamp timer INT LAMP×××
Remotecontrol entry system MULTI REMOTE ENT×××
Headlamp HEAD LAMP×××
Wiper WIPER×××
Turn signal lamp
Hazard lampFLASHER××
Blower fan switch signal
A/C switch signalAIR CONDITONER×
Combination switch COMB SW×
NVIS IMMU××
Interior lamp battery saver BATTERY SAVER×× ×
Trunk lid TRUNK××
Vehicle security system THEFT ALM×××
Retained power control RETAINED PWR×××
Oil pressure switch SIGNAL BUFFER
×
NOTE×
Low tire pressure warning
system AIR PRESSURE
MONITOR××× ×
Panic alarm system PANIC ALARM×