Nissan Altima 2007-2012 Service 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 is a combination of 5 output terminals (OUTPUT 1 - 5) and 5 input terminals (INPUT 1 - 5). It reads a maximum of 20 switch status.

COMBINATION SWITCH MATRIX

NOTE: Headlamp has a dual system switch.

COMBINATION SWITCH READING FUNCTION

Description

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

NOTE: BCM reads the status of the combination switch at 60ms interval when BCM is controlled at low power consumption mode.

• BCM operates as follows and judges the status of the combination switch.

- INPUT 1 - 5 outputs the voltage waveforms of 5 systems simultaneously.

- It operates the transistor on OUTPUT side in the following order: OUTPUT 5 → 4 →3 →2 →1.

- The voltage waveform of INPUT corresponding to the formed circuit changes according to the operation of the transistor on OUTPUT 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 (TURN RH switch) is turned ON

• The circuit between INPUT 1 and OUTPUT 5 is formed when the TURN RH switch is turned ON.

• 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

Example 2: When some switches (turn RH switch, front wiper LO switch) are turned ON

• The circuits between INPUT 1 and OUTPUT 5 and between INPUT 1 and OUTPUT 3 are formed when the TURN RH switch and FR WIPER LOW switch are turned ON.

• 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.

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.

    Body control system
    System Description OUTLINE • BCM (body control module) controls the various electrical components. It inputs the information required to the control from CAN communication and the signal receiv ...

    Signal buffer system
    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:

    CVT position
    Inspection and Adjustment INSPECTION 1. Place selector lever in “P” position, and turn ignition switch ON (engine stop). 2. Make sure that selector lever can be shifted to other than “P” position when brake pedal is depressed. Also make sure that selector lever can be shifted fro ...

    Front wheel hub and knuckle
    Removal and Installation 1. Cotter pin 2. Disc rotor 3. Wheel hub and bearing assembly 4. Splash guard 5. Steering knuckle REMOVAL 1. Remove wheel and tire from vehicle. Refer to WT-66, "Adjustment". 2. Remove brake caliper using power tool, leaving brake caliper hydraulic li ...

    Engine compartment check locations
    QR25DE engine 1. Power steering fluid reservoir 2. Engine coolant reservoir 3. Engine oil filler cap 4. Brake fluid reservoir 5. Air cleaner 6. Fuse block/ Fusible links 7. Battery 8. Engine oil dipstick 9. Radiator cap 10. Drive belt location 11. Windshield-washer fluid reservoir VQ ...