Nissan Pathfinder (2005 year). Instruction — part 87
BCM (BODY CONTROL MODULE)
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2005 Pathfinder
BCM (BODY CONTROL MODULE)
PFP:284B2
System Description
EKS009Q3
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BCM (Body Control Module) controls the operation of various electrical units installed on the vehicle.
BCM FUNCTION
BCM has a combination switch reading function for reading the operation of combination switches (light, wiper
washer, turn signal) in addition to the function for controlling the operation of various electrical components.
Also, it functions as an interface that receives signals from the A/C control unit, and sends signals to ECM
using CAN communication.
COMBINATION SWITCH READING FUNCTION
1.
Description
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BCM reads combination switch (light, wiper) status, and controls various electrical components accord-
ing 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).
2.
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) of the switches are turned ON, circuit of output terminals (OUTPUT 1-5) and input ter-
minals (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
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.
3.
BCM - Operation table of combination switch
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BCM reads operation status of combination switch by the combination shown in the following table.
LIIA0757E
BCS-4
BCM (BODY CONTROL MODULE)
2005 Pathfinder
NOTE:
Headlamp has a dual system switch.
4.
Example 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 lighting
switch 1st position is ON. Then BCM sends tail lamp ON signal to IPDM E/R using CAN communica-
tion.
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When OUTPUT 4 transistor is activated again, BCM detects that voltage changes in INPUT 5 and rec-
ognizes that lighting switch 1st position is continuously ON.
SKIA4959E
BCM (BODY CONTROL MODULE)
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2005 Pathfinder
NOTE:
Each OUTPUT terminal transistor is activated at 10ms intervals. Therefore, after a switch is turned ON,
electrical loads are activated with a time delay. But this time delay is so short that it cannot be noticed.
5.
Operation mode
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Combination switch reading function has operation modes as follows:
Normal status
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When BCM is not in sleep status, OUTPUT terminals (1-5) each turn ON-OFF every 10 ms.
Sleep status
LIIA0760E
BCS-6
BCM (BODY CONTROL MODULE)
2005 Pathfinder
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When BCM is in sleep mode, transistors of OUTPUT 1 and 5 stop the output, and BCM enters low-cur-
rent-consumption mode. OUTPUTS (2, 3, and 4) turn ON-OFF at 60ms intervals, and receives lighting
switch input only.
CAN COMMUNICATION CONTROL
CAN communication allows a high rate of information through the two communication lines (CAN-L, CAN-H)
connecting the various control units in the system. Each control unit transmits/receives data, but selectively
reads required data only.
BCM STATUS CONTROL
BCM changes its status depending on the operation status in order to save power consumption.
1.
CAN communication status
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With ignition switch ON, CAN communicates with other control units normally.
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Control by BCM is being operated properly.
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When ignition switch is OFF, switching to sleep mode is possible.
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Even when ignition switch is OFF, if CAN communication with IPDM E/R and combination meter is
active, CAN communication status is active.
2.
Sleep transient status
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This status shuts down CAN communication when ignition switch is turned OFF.
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It transmits sleep request signal to IPDM E/R and combination meter.
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Two seconds after CAN communication of all control units stops, CAN communication switches to inac-
tive status.
3.
CAN communication inactive status
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With ignition switch OFF, CAN communication is not active.
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With ignition switch OFF, control performed only by BCM is active.
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Three seconds after CAN communication of all control units stops, CAN communication switches to
inactive status.
4.
Sleep status
LIIA1994E
BCM (BODY CONTROL MODULE)
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2005 Pathfinder
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BCM is activated with low current consumption mode.
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CAN communication is not active.
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When CAN communication operation is detected, it switches to CAN communication status.
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When a state of the following switches changes, it switches to CAN communication state:
–
Key switch
–
Hazard switch
–
Door lock/unlock switch
–
Front door switch (LH, RH)
–
Rear door switch (LH, RH)
–
Back door switch
–
Combination switch (passing, lighting switch 1st position, front fog lamp)
–
Keyfob (lock/unlock signal)
–
Door lock assembly LH (key cylinder switch)
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When control performed only by BCM is required by switch, it shifts to CAN communication inactive
mode.
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Status of combination switch reading function is changed.
SYSTEMS CONTROLLED BY BCM DIRECTLY
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Power door lock system. Refer to
BL-16, "POWER DOOR LOCK SYSTEM"
.
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Remote keyless entry system. Refer to
BL-40, "REMOTE KEYLESS ENTRY SYSTEM"
.
●
Power window system. Refer to
.
NOTE
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Sunroof system. Refer to
.
NOTE
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Room lamp timer. Refer to
.
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Warning chime system. Refer to
.
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Turn signal and hazard warning lamps system. Refer to
LT-74, "TURN SIGNAL AND HAZARD WARNING
.
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Rear wiper and washer system. Refer to
WW-37, "REAR WIPER AND WASHER SYSTEM"
.
NOTE:
Power supply only. No system control.
SYSTEMS CONTROLLED BY BCM AND IPDM E/R
●
Panic system. Refer to
BL-40, "REMOTE KEYLESS ENTRY SYSTEM"
.
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NVIS (NATS) system. Refer to
BL-99, "NVIS(NISSAN Vehicle Immobilizer System-NATS)"
.
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Headlamp, tail lamp, auto light and battery saver control systems. Refer to
,
or
LT-31, "HEADLAMP (FOR CANADA) -
.
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Front wiper and washer system. Refer to
WW-4, "FRONT WIPER AND WASHER SYSTEM"
.
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Rear window defogger system. Refer to
.
MAJOR COMPONENTS AND CONTROL SYSTEM
System
Input
Output
Remote keyless entry system
Keyfob
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All door locking actuator
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Back door opener actuator
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Turn signal lamp (LH, RH)
Power door lock system
Front power door lock/unlock
switch (LH, RH)
All door locking actuator
Power supply (IGN) to power window
and sunroof
Ignition power supply
Power supply to power window and sunroof system
Power supply (BAT) to power window
and sunroof
Battery power supply
Power supply to power window and sunroof system
Panic alarm
●
Key switch
●
Keyfob
IPDM E/R
BCS-8
BCM (BODY CONTROL MODULE)
2005 Pathfinder
CAN Communication System Description
EKS009Q4
Refer to
.
Auto light system
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Optical sensor
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Combination switch
IPDM E/R
Battery saver control
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Ignition switch
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Combination switch
IPDM E/R
Headlamp
Combination switch
IPDM E/R
Tail lamp
Combination switch
IPDM E/R
Fog lamp
Combination switch
IPDM E/R
Turn signal lamp
Combination switch
●
Turn signal lamp
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Combination meter
Hazard lamp
Hazard switch
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Turn signal lamp
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Combination meter
Room lamp timer
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Key switch
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Keyfob
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Main power window and door
lock/unlock switch
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Front door switch LH
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All door switch
Interior room lamp
Key warning chime
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Key switch
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Front door switch LH
Combination meter (warning buzzer)
Light warning chime
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Combination switch
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Key switch
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Front door switch LH
Combination meter (warning buzzer)
Vehicle-speed-sensing intermittent
wiper
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Combination switch
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Combination meter
IPDM E/R
Rear window defogger
Rear window defogger switch
IPDM E/R
Air conditioner switch signal
Front air control
ECM
Blower fan switch signal
Front air control
ECM
System
Input
Output
BCM (BODY CONTROL MODULE)
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2005 Pathfinder
Schematic
EKS009Q5
WIWA0572E
BCS-10
BCM (BODY CONTROL MODULE)
2005 Pathfinder
WIWA0573E
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