Nissan Maxima Service and Repair Manual: Combination switch reading system
System Diagram

System Description
OUTLINE
- BCM reads the status of the combination switch (light, turn
signal, wiper and washer) and recognizes the status of each switch.
- BCM has a combination of 5 output terminals (OUTPUT 1 - 5) and 5
input terminals (INPUT 1 - 5) and reads a maximum of 20 switch states.
COMBINATION SWITCH MATRIX
Combination switch circuit

Combination switch INPUT-OUTPUT system list


COMBINATION SWITCH READING FUNCTION
Description
- BCM reads the status of the combination switch at 10ms intervals
normally.

NOTE: BCM reads the status of the combination switch
at 60ms intervals when BCM is controlled at low power consumption 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 1 → 2 →3 →4 →5 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.

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 (TAIL LAMP) is turned ON
- The circuit between OUTPUT 4 and INPUT 5 is formed when the TAIL
LAMP is turned ON.

- BCM detects the combination switch status signal "5D" when the signal of
OUTPUT 4 is input to INPUT 5
- BCM judges that the TAIL LAMP switch is ON when the signal "5D" is
detected.
Example 2: When some switches (TRUN RH, TAIL LAMP) are turned ON
- The circuits between OUTPUT 1 and INPUT 5 and between OUTPUT 4 and
INPUT 5 are formed when the TURN RH switch and TAIL LAMP switch are
turned ON.

- BCM detects the combination switch status signal "5AD" when the signals
of OUTPUT 1 and OUTPUT 4 are input to INPUT 5.
- BCM judges that the TURN RH switch and TAIL LAMP switch are ON when the
signal "5AD" is detected.
WIPER INTERMITTENT DIAL POSITION SETTING (FRONT WIPER INTERMITTENT OPERATION)
BCM judges the wiper intermittent dial 1 - 7 by the status of INT VOLUME 1,
2, and 3 switches.

System Diagram
System Description
BCM (Body Control Module) controls parking, license plate and tail lamps
operation.
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COMMON ITEM
COMMON ITEM : CONSULT Function (BCM - COMMON ITEM)
APPLICATION ITEM
CONSULT performs the following functions via CAN communication with BCM
SYSTEM APPLICATION
BCM can perform the fo ...
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