Nissan Altima (L32) 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.
Parking, license plate and tail lamps
System Diagram System Description • BCM (Body Control Module) controls parking, license plate and tail lamps operation. • IPDM E/R (Intelligent Power Distribution Module Engine Room) op ...Other materials:
Power window main switch
Reference Value
TERMINAL LAYOUT
PHYSICAL VALUES
MAIN POWER WINDOW AND DOOR LOCK/UNLOCK SWITCH
Wiring Diagram
Fail Safe
FAIL-SAFE CONTROL
Switches to fail-safe control when malfunction is detected in encoder signal
that detects up/down speed and
direction of door glass. S ...
Precaution
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER"
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”,
used along
with a front seat belt, helps to reduce the risk or severity of injury to the
dr ...
B2108 steering lock relay
Description
The steering lock relay ON signal is transmitted to IPDM E/R by BCM via CAN
communication.
IPDM E/R turns the steering lock relay ON and transmits the release of the
steering to BCM.
DTC Logic
DTC DETECTION LOGIC
NOTE:
• If DTC B2108 is displayed with DTC U1000, first perf ...