System Description

SYSTEM DIAGRAM 

Courtesy of NISSAN NORTH AMERICA, INC.

OUTLINE 

• The BCM reads the status of the combination switch and recognizes the status of each switch.
• The BCM has a combination of 5 input terminals (INPUT 1 - 5) and 6 output terminals (OUTPUT 1 - 6) and reads a maximum of 18 switch states.

COMBINATION SWITCH MATRIX 

Courtesy of NISSAN NORTH AMERICA, INC.

System	INPUT 1	INPUT 2	INPUT 3	INPUT 4	INPUT 5	INPUT 6
OUTPUT 1	-	INT VOLUME 1	FR WASHER	FR WIPER LO	INT VOLUME 2	NO WIPER
OUTPUT 2	HI BEAM	-	-	FR WIPER HI	INT VOLUME 3	FR WIPER MIST
OUTPUT 3	PASSING	HEADLAMP	-	FR WIPER INT	-	-
OUTPUT 4	-	AUTO LIGHT	TURN LH	-	-	-
OUTPUT 5	FR FOG	TAIL LAMP	TURN RH	NO LIGHT	-	-

COMBINATION SWITCH READING FUNCTION 

Description 

• The BCM reads the status of the combination switch at 10 ms intervals normally.
  NOTE: The BCM reads the status of the combination switch at 60 ms intervals when BCM is controlled at low power consumption control mode.

  Courtesy of NISSAN NORTH AMERICA, INC.

• 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 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.

    Courtesy of NISSAN NORTH AMERICA, INC.

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 - 5 to " - ". Example 1: When a switch (TURN RH) is turned ON

• The circuit between INPUT 3 ( ) and OUTPUT 5 ( ) is formed when the TURN RH switch is turned ON.

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• The BCM detects the combination switch status signal " " when the signal of INPUT 3 is input to OUTPUT 5.
• BCM judges that the TURN RH switch is ON when the signal " " is detected.

Example 2: When some switches (FR FOG, TURN RH) are turned ON

• The circuits between INPUT 1 ( ) and OUTPUT 5 ( ) and between INPUT 3 ( ) and OUTPUT 5 ( ) are formed when the FR FOG switch and TURN RH switch are turned ON.

  Courtesy of NISSAN NORTH AMERICA, INC.

• 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 FR FOG switch and TURN RH switch 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