Combination Switch Reading Function

Description

• BCM reads the status of the combination switch at 10 ms interval normally.
  Fig 1: Combination Switch Reading Timing Pattern

  Courtesy of NISSAN NORTH AMERICA, INC.
  NOTE: BCM reads the status of the combination switch at 60 ms interval when BCM is controlled at low power consumption control mode.
• BCM operates as follows and judges the status of the combination switch.
  • It operates the transistor on OUTPUT side in the following order: OUTPUT 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.
    Fig 2: Transistor Input/Output Blinking Pattern

    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 - 5 to "1 - 5" and OUTPUT 1 - 5 to "A - E".

Example 1: When a switch (TURN RH switch) is turned ON

• The circuit between OUTPUT 4 and INPUT 5 is formed when the TAIL LAMP switch is turned ON.
  Fig 3: Combination Switch Reading Operation Diagram (Turn RH Switch On)

  Courtesy of NISSAN NORTH AMERICA, INC.
  NOTE:

  • *: If so equipped.
  • TAIL LAMP switch links lighting switch 1ST and 2ND positions.
• 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, FR WIPER LOW switch) are turned ON

• The circuits between OUTPUT 5 and INPUT 1 and between OUTPUT 3 and INPUT 1 are formed when the TURN RH switch and FR WIPER LOW switch are turned ON.
  Fig 4: Combination Switch Reading Operation Diagram (Turn RH Switch And Front Wiper Low Switch Turned On)

  Courtesy of NISSAN NORTH AMERICA, INC.
  NOTE:

  • *: If so equipped.
  • TAIL LAMP switch links lighting switch 1ST and 2ND positions.
• 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.