System Description

SYSTEM DIAGRAM 

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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 

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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.

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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 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 - 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.

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• 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.

NOTE: For details of wiper intermittent dial position: Refer to System Description .