Nissan Pathfinder (2009 year). Instruction — part 83
BCS
BODY CONTROL SYSTEM
BCS-5
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FUNCTION DIAGNOSIS
BODY CONTROL SYSTEM
System Description
INFOID:0000000003935246
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 com-
ponents. It also has the signal transmission function as the passed point of signal and the power consump-
tion 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 set-
tings.
BCM control function list
System
Refer to
Combination switch reading system
Signal buffer system
Power consumption control system
Auto light system
Turn signal and hazard warning lamp system
Headlamp system
Front fog lamp system (if equipped)
Daytime running light system
Interior room lamp control system
Step lamp system
Interior room lamp battery saver system
Front wiper and washer system
Rear wiper and washer system
Warning chime system
WCS-4, "WARNING CHIME SYSTEM : System Diagram"
Door lock system
• WITH INTELLIGENT KEY SYSTEM:
• WITHOUT INTELLIGENT KEY SYSTEM:
UNLOCK SWITCH : System Diagram"
(NATS) Nissan anti-theft system
• WITH INTELLIGENT KEY SYSTEM:
• WITHOUT INTELLIGENT KEY SYSTEM:
Vehicle security system
• WITH INTELLIGENT KEY SYSTEM:
• WITHOUT INTELLIGENT KEY SYSTEM:
Rear window defogger system
Remote keyless entry system
DLK-215, "REMOTE KEYLESS ENTRY : System Diagram"
Intelligent Key system (if equipped)
DLK-45, "CONSULT-III Function (INTELLIGENT KEY)"
Power window system
RAP (retained accessory power) system
BCS-28, "RETAINED PWR : CONSULT-III Function (BCM - RETAINED
PWR)"
TPMS (tire pressure monitoring system)
2009 Pathfinder
BCS-6
< FUNCTION DIAGNOSIS >
BODY CONTROL SYSTEM
Component Parts Location
INFOID:0000000003935247
• BCM M18, M19, M20 (view with instrument panel removed)
LKIA0564E
2009 Pathfinder
BCS
COMBINATION SWITCH READING SYSTEM
BCS-7
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COMBINATION SWITCH READING SYSTEM
System Diagram
INFOID:0000000003935248
System Description
INFOID:0000000003935249
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 combination of 5 output terminals (OUTPUT 1 - 5) and 5 input terminals (INPUT 1 - 5). It reads a
maximum of 20 switch status.
COMBINATION SWITCH MATRIX
LIIA0757E
2009 Pathfinder
BCS-8
< FUNCTION DIAGNOSIS >
COMBINATION SWITCH READING SYSTEM
Combination switch circuit
Combination switch INPUT-OUTPUT system list
NOTE:
Headlamp has a dual system switch.
COMBINATION SWITCH READING FUNCTION
Description
• BCM reads the status of the combination switch at 10 ms interval normally.
NOTE:
BCM reads the status of the combination switch at 20 ms interval when BCM is controlled at low power con-
sumption control mode.
• BCM operates as follows and judges the status of the combination switch.
- INPUT 1 - 5 outputs the voltage waveforms of 5 systems simultaneously.
- It operates the transistor on OUTPUT side in the following order: OUTPUT 5
→
4
→
3
→
2
→
1.
System
OUTPUT 1
OUTPUT 2
OUTPUT 3
OUTPUT 4
OUTPUT 5
INPUT 1
—
FR WASHER
FR WIPER LOW
TURN LH
TURN RH
INPUT 2
FR WIPER HI
—
FR WIPER INT
PASSING
HEADLAMP 1
INPUT 3
INT VOLUME 1
RR WASHER
—
HEADLAMP 2
HI BEAM
INPUT 4
RR WIPER INT
INT VOLUME 3
AUTO LIGHT
—
TAIL LAMP
INPUT 5
INT VOLUME 2
RR WIPER
—
FR FOG
—
LIIA0760E
JPMIA0067GB
2009 Pathfinder
BCS
COMBINATION SWITCH READING SYSTEM
BCS-9
< FUNCTION DIAGNOSIS >
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- The voltage waveform of INPUT corresponding to the formed circuit changes according to the operation of
the transistor on OUTPUT side if any (1 or more) switches are ON.
- It reads this change of the voltage as the status signal of the combination switch.
Operation Example
In the following operation example, the combination of the status signals of the combination switch is replaced
as follows: INPUT 1 - 5 to “1 - 5” and OUTPUT 1 - 5 to “A - E”.
Example 1: When a switch (TURN RH switch) is turned ON
• The circuit between INPUT 1 and OUTPUT 5 is formed when the TURN RH switch is turned ON.
• BCM detects the combination switch status signal “1E” when the signal of OUTPUT 5 is input to INPUT 1.
• BCM judges that the TURN RH switch is ON when the signal “1E” is detected.
Example 2: When some switches (turn RH switch, front wiper LO switch) are turned ON
JPMIA0068GB
ALMIA0260GB
2009 Pathfinder
BCS-10
< FUNCTION DIAGNOSIS >
COMBINATION SWITCH READING SYSTEM
• The circuits between INPUT 1 and OUTPUT 5 and between INPUT 1 and OUTPUT 3 are formed when the
TURN RH switch and FR WIPER LOW switch are turned ON.
• BCM detects the combination switch status signal “1CE” when the signals of OUTPUT 3 and OUTPUT 5 are
input to INPUT 1.
• BCM judges that the TURN RH switch and FR WIPER LOW switch are ON when the signal “1CE” is
detected.
WIPER INTERMITTENT DIAL POSITION SETTING (FRONT WIPER INTERMITTENT OPERATION)
BCM judges the wiper intermittent dial 1 - 7 by the status of INT VOLUME 1, 2 and 3 switches.
Component Parts Location
INFOID:0000000003935250
ALMIA0261GB
Wiper intermittent
dial position
Intermittent
operation delay
interval
INT VOLUME switch ON/OFF status
INT VOLUME 1 switch
INT VOLUME 2 switch
INT VOLUME 3 switch
1
Short
↑
↓
Long
ON
ON
ON
2
ON
ON
OFF
3
ON
OFF
OFF
4
OFF
OFF
OFF
5
OFF
OFF
ON
6
OFF
ON
ON
7
OFF
ON
OFF
ALMIA0308ZZ
2009 Pathfinder
BCS
COMBINATION SWITCH READING SYSTEM
BCS-11
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1.
BCM M18, M19, M20 (view with low-
er instrument panel LH removed)
2.
Combination switch (lighting and
turn signal switch) M28
3.
Combination switch (wiper and
washer switch) M28
2009 Pathfinder
BCS-12
< FUNCTION DIAGNOSIS >
SIGNAL BUFFER SYSTEM
SIGNAL BUFFER SYSTEM
System Diagram
INFOID:0000000003935251
System Description
INFOID:0000000003935252
OUTLINE
BCM has the signal transmission function that outputs/transmits each input/received signal to each unit.
Signal transmission function list
ALMIA0263GB
Signal name
Input
Output
Description
Oil pressure switch signal
IPDM E/R (CAN)
Combination meter (CAN)
Transmits the received oil pres-
sure switch signal via CAN
communication.
2009 Pathfinder
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