Nissan Tiida C11. Manual — part 36
BCS-8
< FUNCTION DIAGNOSIS >
BODY CONTROL SYSTEM
Component Parts Location
INFOID:0000000001451454
• BCM (1) M18, M19, M20 (view with glove box removed)
Power window system
PTC heater control system
HAC-142, "PTC HEATER (300 WATT) : PTC Heater System Description"
System
Refer to
WKIA5663E
BCS
COMBINATION SWITCH READING SYSTEM
BCS-9
< FUNCTION DIAGNOSIS >
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
COMBINATION SWITCH READING SYSTEM
System Diagram
INFOID:0000000001451455
System Description
INFOID:0000000001451456
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
Combination switch circuit
Combination switch INPUT-OUTPUT system list
JPMIA0120GB
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
JPMIA0121GB
BCS-10
< 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 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.
- 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
RR WIPER INT
INT VOLUME 3
AUTO LIGHT
—
TAIL LAMP
INPUT 5
INT VOLUME 2
RR WIPER
RR FOG
FR FOG
—
System
OUTPUT 1
OUTPUT 2
OUTPUT 3
OUTPUT 4
OUTPUT 5
JPMIA0067GB
JPMIA0068GB
BCS
COMBINATION SWITCH READING SYSTEM
BCS-11
< 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.
JPMIA0122GB
JPMIA0123GB
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