Nissan Sentra B18 (2020-2025) Service Manual: Combination Switch Reading System
System Description
SYSTEM DIAGRAM
OUTLINE
-
The BCM reads the status of the combination switch and recognizes the status of each switch.
-
The BCM has a combination of 6 input terminals (INPUT 1 - 6) and 6 output terminals (OUTPUT 1 - 6) and reads a maximum of 22 switch states.
COMBINATION SWITCH MATRIX
|
System |
INPUT 1 |
INPUT 2 |
INPUT 3 |
INPUT 4 |
INPUT 5 |
INPUT 6 |
|---|---|---|---|---|---|---|
|
OUTPUT 1 |
Check diode 1 |
INT volume 1 |
Front washer switch |
Front wiper LO |
INT volume 2 |
Front wiper OFF |
|
OUTPUT 2 |
High beam switch |
Check diode 2 |
Rear washer switch |
Front wiper HI |
INT volume 3 |
Front wiper MIST |
|
OUTPUT 3 |
Passing switch |
Low beam switch |
Check diode 3 |
Front wiper INT |
Rear wiper INT |
— |
|
OUTPUT 4 |
Rear fog switch |
AUTO light switch |
Turn signal LH |
Check diode 4 |
Rear wiper ON |
— |
|
OUTPUT 5 |
Front fog switch |
Tail lamp switch |
Turn signal RH |
Light OFF switch |
Check diode 5 |
— |
|
OUTPUT 6 |
— |
— |
— |
— |
— |
Check diode 6 |
COMBINATION SWITCH READING FUNCTION
Description
-
The BCM reads the status of the combination switch at 10 ms intervals normally.
-
The BCM operates as follows and judges the status of the combination switch:
-
It operates the transistor on INPUT side in the following order: OUTPUT 6–> 5 –> 4 –> 3 –> 2 –> 1, and outputs voltage waveform.
-
The voltage waveform of OUTPUT corresponding to the formed circuit is input into the interface on the INPUT 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 - 6 to “
- 
” and OUTPUT 1
- 6 to “
- 
”.
Example 1: When a switch (turn signal RH) is turned ON
-
The circuit between INPUT 3 (
) and OUTPUT 5 (
) is formed when the turn signal RH is
turned ON.
-
The BCM detects the combination switch status signal “
” when the signal of INPUT 3
is input
to OUTPUT 5. -
The BCM judges that the turn signal RH is ON when the signal “
” is detected.
Example 2: When multiple switches (front fog switch, turn signal RH) are turned ON
-
The circuits between INPUT 1 (
) and OUTPUT 5 () and between INPUT 3 () and
OUTPUT 5 () are formed when the front fog switch
and turn signal RH are turned ON.
-
The BCM detects the combination switch status signal “
” when the signals of INPUT 1 and INPUT
3 are input to OUTPUT 5. -
The BCM judges that the front fog switch and turn signal RH are ON when the signal “
” is detected.
WIPER INTERMITTENT DIAL POSITION (WITH WIPER INTERMITTENT DIAL POSITION)
The BCM judges the wiper intermittent dial 1 - 5 by the status of INT volume 1, 2 and 3 switches.
|
Wiper intermittent dial position |
Switch status |
||
|---|---|---|---|
|
INT volume 1 |
INT volume 2 |
INT volume 3 |
|
|
1 |
ON |
ON |
OFF |
|
2 |
ON |
OFF |
OFF |
|
3 |
OFF |
OFF |
OFF |
|
4 |
OFF |
OFF |
ON |
|
5 |
OFF |
ON |
ON |
For details of wiper intermittent dial position, refer to System Description.
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