Infiniti QX56 (JA60). Manual — part 98
BCS
COMBINATION SWITCH READING SYSTEM
BCS-11
< FUNCTION DIAGNOSIS >
[BCM]
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
1.
BCM M18, M19, M20 (view with in-
strument panel removed)
2.
Combination switch (lighting and
turn signal switch) M28
3.
Combination switch (wiper and
washer switch) M28
BCS-12
< FUNCTION DIAGNOSIS >
[BCM]
SIGNAL BUFFER SYSTEM
SIGNAL BUFFER SYSTEM
System Diagram
INFOID:0000000005146389
System Description
INFOID:0000000005146390
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.
BCS
POWER CONSUMPTION CONTROL SYSTEM
BCS-13
< FUNCTION DIAGNOSIS >
[BCM]
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
POWER CONSUMPTION CONTROL SYSTEM
System Diagram
INFOID:0000000005146391
System Description
INFOID:0000000005146392
OUTLINE
• BCM incorporates a power consumption control function that reduces the power consumption according to
the vehicle status.
• BCM switches the status (control mode) by itself with the power saving control function. It performs the sleep
request to each unit (PDM E/R, combination meter and Intelligent Key unit) that operates with the ignition
switch OFF.
Normal mode (wake-up)
- CAN communication is normally performed with other units
- Each control with BCM is operating properly
CAN communication sleep mode (CAN sleep)
- CAN transmission is stopped
- Control with BCM only is operating
Low power consumption mode (BCM sleep)
- Low power consumption control is active
- CAN transmission is stopped
LOW POWER CONSUMPTION CONTROL WITH BCM
BCM reduces the power consumption with the following operation in the low power consumption mode.
• The reading interval of the each switches changes from 10 ms interval to 20 ms interval.
Sleep mode activation
• BCM receives the sleep-ready signal (ready) from IPDM E/R, combination meter and Intelligent Key unit via
CAN communication.
• BCM transmits the sleep wake up signal (sleep) to each unit when all of the CAN sleep conditions are ful-
filled.
• Each unit stops the transmission of CAN communication with the sleep wake up signal. BCM is in CAN com-
munication sleep mode.
• BCM is in the low power consumption mode and perform the low power consumption control when all of the
BCM sleep conditions are fulfilled with CAN sleep condition.
AWMIA0082GB
BCS-14
< FUNCTION DIAGNOSIS >
[BCM]
POWER CONSUMPTION CONTROL SYSTEM
Sleep condition
Wake-up operation
• BCM transmits sleep wake up signal (wake up) to each unit when any condition listed below is established,
and then goes into normal mode from low power consumption mode.
• Each unit starts transmissions with CAN communication by receiving sleep wake up signals. Each unit trans-
mits wake up signals to BCM with CAN communication to convey the start of CAN communication.
Wake-up condition
CAN sleep condition
BCM sleep condition
• Receiving the sleep-ready signal (ready) from all units
• Ignition switch: OFF
• Vehicle security system alarm: No operation
• Warning lamp: No operation
• Warning chime: No operation
• Stop lamp switch: OFF
• Key switch status: No change for 2 seconds
• Hazard warning lamp: No operation
• Exterior lamp: OFF
• Door lock status: No change for 2 seconds
• CONSULT-III communication status: No communication
• Door switch status: No change for 2 seconds
The controls only BCM are completed.
(Interior room lamp battery saver: Time out etc.)
BCM wake-up condition
• Ignition switch: OFF
→ ACC or ON
• Stop lamp switch: ON (Depress brake pedal)
• Any door switch: OFF
→ ON
• Lighting switch: OFF
→ 1ST or PASS
• Hazard switch: OFF
→ ON
• Back door opener switch OFF
→ ON
• Remote keyless entry receiver: Receiving
• Intelligent Key unit: Receiving
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