BLIND SPOT MONITORING (BSM) CONTROL MODULE

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Purpose

Functions

Object detection function

•  The blind spot monitoring (BSM) control module detects objects at the rear of the vehicle using radar which detects vehicles at wide angles. The detection range for each radar is as follows.

Note

•  The detection ability of the blind spot monitoring (BSM) control module has limitations. In the following cases, the detection ability may lower and the system may not operate normally.

―  The rear bumper near the blind spot monitoring (BSM) control module has become deformed.

―  Snow, ice or mud adheres to the blind spot monitoring (BSM) control module on the rear bumper.

―  Under bad weather conditions such as rain, snow and fog.

•  Under the following conditions, the blind spot monitoring (BSM) control module cannot detect target objects or it may be difficult to detect them.

―  Stationary objects on a road or a road side such as small, two-wheeled vehicles, bicycles, pedestrians, animals, and shopping carts.

―  Vehicle shapes which do not reflect radar waves well such as empty trailers with a low vehicle height and sports cars.

•  Turn off the system while pulling a trailer or while an accessory such as a bicycle carrier is installed to the rear of the vehicle. Otherwise, the radio waves emitted by the radar will be blocked causing the system to not operate normally.

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•  The blind spot monitoring (BSM) control module emits radar and based on the reflected microwaves and signals from related modules (vehicle speed signal, steering angle signal, yaw rate signal, vehicle wheel speed signal), it calculates the position and relative speed of the detected object and determines whether or not the object is an approaching vehicle.

Blind sport monitoring (BSM) indicator light brightness level change function

•  The blind spot monitoring (BSM) control module dims the blind spot monitoring (BSM) warning indicator lights based on the panel light signal from the instrument cluster. In addition, it cancels the dimming operation using the brightness level change function based on the dimmer cancel signal from the instrument cluster and turns on the blind spot monitoring (BSM) warning indicator lights at normal brightness.

Note

•  If the blind spot monitoring (BSM) warning indicator lights are turned on using the simulation function WRN_IND_R or WRN_IND_L for the blind spot monitoring (BSM) system, the indicator lights turn on at the normal brightness.

Automatic configuration function

•  When the ignition is switched ON (engine off or on) for the first time after the blind spot monitoring (BSM) control module has been replaced, the blind spot monitoring (BSM) control module reads the specification information sent via CAN communication from the instrument cluster and it performs automatic configuration.

Radar emission angle correction function

•  The blind spot monitoring (BSM) control module corrects deviations in the radar emission angles, caused by installation tolerances after related part replacement, by implementing the radar aiming procedure. For the radar aiming implementation timing and procedure, refer to the [BLIND SPOT MONITORING (BSM) AIMING] in the workshop manual.

System operation/non-operation recording function

•  The blind spot monitoring (BSM) control module records the system operation/non-operation status from the blind spot monitoring (BSM) off switch. The system operation/non-operation status recorded by the blind spot monitoring (BSM) control module is not erased, even if the battery power is disconnected.

Structure/Construction

•  The blind spot monitoring (BSM) control module has one integrated transmitter which emits 24 GHz radar and two receivers which receive reflected radio waves.

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Operation

Object detection

•  The blind spot monitoring (BSM) control module calculates the position and relative vehicle speed of the object detected by radar based on the following signals. The blind spot monitoring (BSM) control module (LH) transmits the signals from related modules, received via the instrument cluster, to the blind spot monitoring (BSM) control module (RH) via local CAN communication, and the signals from the blind spot monitoring (BSM) control module (RH) are transmitted to related modules via the instrument cluster.

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•  The blind spot monitoring (BSM) control module emits 24 GHz radar waves from the transmitter integrated in the module, and receives the reflected radar waves using the two built-in receivers. The blind spot monitoring (BSM) control module calculates the distance between the object and vehicle based on the time required to receive the reflected radar waves that were emitted, and it calculates the angle (horizontal angle) of the object with the vehicle based on the phase difference between the arriving reflected waves received by the foyr receivers.

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•  The blind spot monitoring (BSM) control module calculates the detected direction of travel and relative speed with the detecting vehicle based on the signals (vehicle speed signal, steering angle signal, yaw rate signal, vehicle wheel speed signal) received from the related modules, determines whether or not the object is an approaching vehicle, and monitors the approaching vehicle as a monitoring target.

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Fail-safe

Blind spot monitoring (BSM) control module (LH)

Blind spot monitoring (BSM) control module (RH)