Combination Switch Reading Function

Description 

• The BCM reads the status of the combination switch at 10 ms intervals normally.

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• 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.

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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.

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• 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.

  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 Front fog switch and Turn signal RH are ON when the signal " " is detected.