Infiniti G37 Coupe. Manual — part 222
BCS-6
< FUNCTION DIAGNOSIS >
COMBINATION SWITCH READING SYSTEM
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 60 ms interval when BCM is controlled at low power con-
sumption 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.
- 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
INPUT 4
—
INT VOLUME 3
AUTO LIGHT
—
TAIL LAMP
INPUT 5
INT VOLUME 2
—
—
FR FOG
—
System
OUTPUT 1
OUTPUT 2
OUTPUT 3
OUTPUT 4
OUTPUT 5
JPMIA0067GB
JPMIA0068GB
BCS
COMBINATION SWITCH READING SYSTEM
BCS-7
< FUNCTION DIAGNOSIS >
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
• 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
• 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.
JPMIA0073GB
JPMIA0074GB
BCS-8
< FUNCTION DIAGNOSIS >
COMBINATION SWITCH READING SYSTEM
Component Parts Location
INFOID:0000000001612374
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
1.
Combination switch
2.
BCM
A.
Dash side lower (passenger side)
JPMIA0071ZZ
BCS
SIGNAL BUFFER SYSTEM
BCS-9
< FUNCTION DIAGNOSIS >
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
SIGNAL BUFFER SYSTEM
System Diagram
INFOID:0000000001612375
System Description
INFOID:0000000001612376
OUTLINE
BCM has the signal transmission function that outputs/transmits each input/received signal to each unit.
Signal transmission function list
JPMIA0070GB
Signal name
Input
Output
Description
• Ignition switch ON signal
• Ignition switch signal
Push-button ignition switch
(push switch)
• IPDM E/R (CAN)
• Driver seat control unit (CAN)
Inputs the push-button ignition
switch (push switch) signal and
transmits the ignition switch sta-
tus judged with BCM via CAN
communication.
Door switch signal
Any door switch
• Combination meter (via uni-
fied meter and A/C amp.)
(CAN)
• IPDM E/R (CAN)
• Driver seat control unit (CAN)
• AV control unit (CAN)
Inputs the door switch signal
and transmits it via CAN com-
munication.
Trunk switch signal
Trunk room lamp switch
• Combination meter (via uni-
fied meter and A/C amp.)
(CAN)
• AV control unit (CAN)
Inputs the trunk room lamp
switch signal and transmits the
trunk switch signal via CAN
communication.
Oil pressure switch signal
IPDM E/R (CAN)
Combination meter (via unified
meter and A/C amp.) (CAN)
Transmits the received oil pres-
sure switch signal via CAN
communication.
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