Toyota Tacoma (2015-2018) Service Manual: System Description

Toyota Tacoma (2015-2018) Service Manual / Park Assist / Monitoring / Blind Spot Monitor System / System Description

SYSTEM DESCRIPTION

1. GENERAL

(a) The blind spot monitor system has the blind spot monitor function and rear cross traffic alert function.

(1) Blind spot monitor function

The blind spot monitor function is a function that assists the driver in making the decision to change lanes. The function uses quasi-millimeter wave radar to detect vehicles that are traveling in an adjacent lane in the area that is not reflected in the outer rear view mirror assembly. The function advises the driver of the existence of a vehicle by illuminating the outer rear view mirror indicator on the outer rear view mirror assembly.
If the turn signal switch is operated while the outer rear view mirror indicator on an outer rear view mirror assembly is illuminated, the indicator starts blinking to give additional warning to the driver.

(2) Rear cross traffic alert function

The rear cross traffic alert function is a function that informs the driver of an approaching vehicle from diagonally behind. The function uses quasi-millimeter wave radar to detect the positions of and relative speed to a vehicle. When the function determines that a vehicle is approaching this vehicle, this function informs the driver of it using the indicators and buzzer.

2. FUNCTION OF COMPONENTS

Component	Function
Blind Spot Monitor Sensor	Consists of a 24 GHz radar module and an integrated processing module. Illuminates or blinks the outer rear view mirror indicator on the outer rear view mirror assembly. Sounds the rear cross traffic alert buzzer (blind spot monitor buzzer) when the rear cross traffic alert function is operating. Changes the outer rear view mirror indicator on the outer rear view mirror assembly from illuminated to blinking when a turn signal switch operation signal is received from the windshield wiper switch assembly with the blind spot monitor function operating. Dims the outer rear view mirror indicator on the outer rear view mirror assembly and blind spot monitor indicator on the blind spot monitor main switch assembly (warning canceling switch assembly). Turns on the blind spot monitor indicator on the blind spot monitor main switch assembly (warning canceling switch assembly) when the blind spot monitor main switch assembly (warning canceling switch assembly) is on.
Outer Rear View Mirror Assembly Outer Rear View Mirror (Blind Spot Monitor Indicator)	Turns on or blinks the indicator based on a signal from the blind spot monitor sensor.
Blind Spot Monitor Main Switch Assembly (Warning Canceling Switch Assembly) Blind Spot Monitor Indicator	Turns the blind spot monitor system on or off. Informs the state of the blind spot monitor system by illuminating the blind spot monitor indicator.
Rear Cross Traffic Alert Buzzer (Blind Spot Monitor Buzzer)	Sounds based on a signal from the blind spot monitor sensor.
Combination Meter Assembly Multi-information Display	Displays an error message on the multi-information display if the blind spot monitor detects a malfunction while it is operating. Receives a turn signal from headlight dimmer switch assembly. Sends a turn signal to the blind spot monitor sensor via CAN communication.
Main Body ECU (Multiplex Network Body ECU)	Sends the destination information and the dimmer signal to the blind spot monitor sensor via CAN communication.
Skid Control ECU (Brake Actuator Assembly)	Transmits a vehicle speed signal to the blind spot monitor sensor via CAN communication.
ECM	Sends a shift position signal (R) to the blind spot monitor sensor via CAN communication.*1
Back-up Light Switch Assembly	Sends a shift position signal (R) to the blind spot monitor sensor.*2
Spiral Cable with Sensor Sub-assembly	Detects the angle of the steering wheel and sends the resulting signals to the blind spot monitor sensor via CAN communication.

*1: for Automatic Transmission
*2: for Manual Transmission

3. OPERATION DESCRIPTION

(a) Operation description of the blind spot monitor function

(1) Operation conditions

The blind spot monitor main switch assembly (warning canceling switch assembly) is on.
Vehicle speed is more than approximately 16 km/h (10 mph).

(2) Conditions in which a sensor can detect a vehicle

The blind spot monitor function indicates detection of a vehicle in the detection area when either condition is met:

When a vehicle is detected in an adjacent lane overtaking this vehicle.
When a vehicle is detected entering the detection area because it changed lanes.

(3) Detection area

Vehicles in the following areas can be detected:

Text in Illustration

*a	Vehicles in the following areas can be detected:
*b	Within approximately 3.5 m (11.49 ft.) from the side of the vehicle
*c	Within approximately 3 m (9.85 ft.) behind the rear bumper
*d	Within approximately 1 m (3.29 ft.) forward of the rear bumper

(b) Operation description of the rear cross traffic alert function.

(1) Operation conditions:

The blind spot monitor main switch assembly (warning canceling switch assembly) is on.
The shift lever is in R.
The vehicle speed is less than approximately 8 km/h (5 mph).

(2) Conditions in which a sensor can detect a vehicle

The rear cross traffic alert function indicates detection of a vehicle in the detection area when both conditions are met:

A vehicle is approaching this vehicle from diagonally behind.
The vehicle speed is approximately 8 km/h (5 mph) to 28 km/h (18 mph).

(3) Detection area

Vehicles in the following areas can be detected:

Text in Illustration

*a	Vehicles in the following areas can be detected:
*b	Within approximately 5.5 to 20 m (18.04 to 65.62 ft.) from the side of the vehicle (detection area changes according to vehicle speed)
*c	Within approximately 6 m (19.69 ft.) behind the rear bumper

4. OPERATION OF OUTER REAR VIEW MIRROR INDICATOR AND REAR CROSS TRAFFIC ALERT BUZZER (BLIND SPOT MONITOR BUZZER)

(a) Initial check

(1) When the blind spot monitor main switch assembly (warning canceling switch assembly) is turned on with the ignition switch ON, the outer rear view mirror indicator on each outer rear view mirror assembly illuminates for 3 seconds and the rear cross traffic alert buzzer assembly (blind spot monitor buzzer) sounds for 1 second.

(2) When the ignition switch is turned from off to ON with the blind spot monitor main switch assembly (warning canceling switch assembly) on, the outer rear view mirror indicator on each outer rear view mirror assembly illuminates for 3 seconds.

(b) Operation for each function

(1) Operation for blind spot monitor function

When a sensor detects a vehicle in the blind spot area, the outer rear view mirror indicator on the outer rear view mirror assembly illuminates.
While the sensor is detecting a vehicle in the detection area and the indicator is illuminated, if the turn signal switch is operated, the outer rear view mirror indicator on the outer rear view mirror assembly starts blinking as shown in the illustration.

Text in Illustration

*a	0.125 seconds

(2) Operation for rear cross traffic alert function

When all of the operation conditions for the rear cross traffic alert function are met, the outer rear view mirror indicators on the outer rear view mirror assembly blink for 2.5 seconds and the rear cross traffic alert buzzer (blind spot monitor buzzer) sounds for 2.3 seconds as shown in the illustration.

Text in Illustration

*a	0.125 seconds	*b	2.5 seconds
*c	0.1 seconds	*d	0.4 seconds
*e	2.3 seconds	-	-

Parts Location

PARTS LOCATION ILLUSTRATION ILLUSTRATION ...

System Diagram

SYSTEM DIAGRAM ...

Other materials:

Headlight Relay
Inspection INSPECTION PROCEDURE 1. INSPECT HEADLIGHT RELAY (a) Check the resistance. (1) Using an ohmmeter, measure the resistance between the terminals. Standard: Tester Connection Specified Condition 3-5 10 kΩ or higher ...

Freeze Frame Data
FREEZE FRAME DATA DESCRIPTION (a) Whenever a lane departure alert system is stored, the forward recognition camera stores the current vehicle state (ECU and sensor information) as Freeze Frame Data. CHECK FREEZE FRAME DATA (a) Connect the Techstream to the DLC3. (b) Turn the ignition switch ...

Disassembly
DISASSEMBLY PROCEDURE 1. REMOVE STEERING GEAR OUTLET RETURN TUBE (a) Using a union nut wrench, remove the steering gear outlet return tube. 2. REMOVE STEERING TURN PRESSURE TUBE (a) Using a union nut wrench, remove the 2 pressure tubes. (b) Remove the 4 O-rings from the pressure tubes. 3. ...