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 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 Description
OUTLINE
ECU DIAGNOSIS INFORMATION controls the various electrical
components. It inputs the information required to
the control from CAN communication and the signal rece ...
System Diagram
System Description
OUTLINE
BCM has the signal transmission function that outputs/transmits each
input/received signal to each unit.
Signal transmission function list
...
Other materials:
Subwoofer
Description
The AV control unit sends audio signals to the BOSE speaker amp. The BOSE
speaker amp. amplifies the
audio signals before sending them to the subwoofers using the audio signal
circuits.
Diagnosis Procedure
1.CONNECTOR CHECK
Check the AV control unit, BOSE speaker amp. and subwo ...
Explanation of scheduled maintenance items
The following descriptions are provided to give
you a better understanding of the scheduled
maintenance items that should be regularly
checked or replaced. The maintenance schedule
indicates at which mileage/time intervals each
item requires service.
In addition to scheduled maintenance, you ...
Charging system
System Diagram
System Description
The generator provides DC voltage to operate the vehicle's electrical system
and to keep the battery charged.
The voltage output is controlled by the IC regulator.
Component Description
...