Pre-Collision (Diagnostic Codes & Circuit Tests): Overview Lexus RX III

DESCRIPTION

The seat belt control ECU receives information from the driving support ECU through CAN communication and tightens the seat belt by operating the motor in the front seat outer belt assembly RH.

Scheme 77

The seat belt control ECU receives information from the driving support ECU through CAN communication and tightens the seat belt by operating the motor in the front seat outer belt assembly RH.

The seat belt control ECU receives information from the driving support ECU using CAN communication and tightens the seat belt by operating the motor in the front seat outer belt assembly RH.

The seat belt control ECU receives information from the driving support ECU using CAN communication and tightens the seat belt by operating the motor in the front seat outer belt assembly RH.

The seat belt control ECU receives information from the driving support ECU using CAN communication and tightens the seat by operating the motor in the front seat outer belt assembly RH.

The seat belt control ECU receives information from the driving support ECU using CAN communication and tightens the seat by operating the motor in the front seat outer belt assembly RH.

The seat belt control ECU receives information from the driving support ECU using CAN communication and tightens the seat belt by operating the motor in the front seat outer belt assembly LH.

Scheme 78

The seat belt control ECU receives information from the driving support ECU using CAN communication and tightens the seat belt by operating the motor in the front seat outer belt assembly LH.

The seat belt control ECU receives information from the driving support ECU using CAN communication and tightens the seat belt by operating the motor in the front seat outer belt assembly LH.

The seat belt control ECU receives information from the driving support ECU using CAN communication and tightens the seat belt by operating the motor in the front seat outer belt assembly LH.

The seat belt control ECU receives information from the driving support ECU using CAN communication and tightens the seat belt by operating the motor in the front seat outer belt assembly LH.

The seat belt control ECU receives information from the driving support ECU using CAN communication and tightens the seat belt by operating the motor in the front seat outer belt assembly LH.

The DTCs above are stored during seat belt control ECU self diagnosis.

HINT

1. When DTC B2015 or B2016 is detected, DTCs B2026 and B2027 will not be detected.
2. When DTC B2020 or B2021 is detected, DTCs B2031 and B2032 will not be detected.

The DTCs above are stored during seat belt control ECU self diagnosis.

HINT

1. When DTC B2015 or B2016 is detected, DTCs B2026 and B2027 will not be detected.
2. When DTC B2020 or B2021 is detected, DTCs B2031 and B2032 will not be detected.

If the seat belt control ECU judges that there is a malfunction in its internal circuit as a result of self-diagnosis, or if the power source voltage (+B) is not input to the seat belt control ECU, this DTC will be stored.

If the seat belt control ECU judges that there is a malfunction in its internal circuit as a result of self-diagnosis, or if the power source voltage (+B) is not input to the seat belt control ECU, this DTC will be stored.

This DTC is stored when a malfunction in the vehicle stability control system is detected. This circuit consists of the skid control ECU and seat belt control ECU. Signals are sent from the skid control ECU using the CAN communication.

This DTC is stored when a malfunction in the vehicle stability control system is detected. This circuit consists of the skid control ECU and seat belt control ECU. Signals are sent from the skid control ECU using the CAN communication.

The seat belt control ECU is connected to the main body ECU using CAN communication.

The seat belt control ECU receives vehicle model information from the main body ECU and determines whether the seat belt buckle switch information from the center airbag sensor assembly is for the driver seat or the passenger seat.

DTC B2064 is stored when the CAN communication frame with the main body ECU is normal and communication is available, but the steering wheel position information is not set or varies.

The seat belt control ECU is connected to the main body ECU using CAN communication.

The seat belt control ECU receives vehicle model information from the main body ECU and determines whether the seat belt buckle switch information from the center airbag sensor assembly is for the driver seat or the passenger seat.

DTC B2064 is stored when the CAN communication frame with the main body ECU is normal and communication is available, but the steering wheel position information is not set or varies.

These DTCs are stored when a malfunction is detected in the driver side buckle switch circuit or passenger side buckle switch circuit.

Scheme 79

These DTCs are stored when a malfunction is detected in the driver side buckle switch circuit or passenger side buckle switch circuit.

This DTC is stored when CAN communication between the driving support ECU and skid control ECU (brake actuator) is interrupted.

This circuit consists of the driving support ECU, skid control ECU (brake actuator) and seat belt control ECU. DTC B2085 is stored when the seat belt control ECU detects an interruption in CAN communication between the driving support ECU and skid control ECU (brake actuator).

This DTC is stored when CAN communication between the driving support ECU and skid control ECU (brake actuator) is interrupted.

This circuit consists of the driving support ECU, skid control ECU (brake actuator) and seat belt control ECU. DTC B2085 is stored when the seat belt control ECU detects an interruption in CAN communication between the driving support ECU and skid control ECU (brake actuator).

The seat belt control ECU receives collision information from the driving support ECU and skid control ECU via CAN communication, and tightens the seat belt by operating the motor inside the front seat outer belt.

When the driving support ECU detects a malfunction in the dynamic radar cruise control system and pre-collision system, the malfunction information is sent to the seat belt control ECU, which outputs this DTC.

When DTC B2090 is detected, other DTCs are also stored by the driving support ECU (dynamic radar cruise control system and pre-collision system).

The seat belt control ECU receives collision information from the driving support ECU and skid control ECU via CAN communication, and tightens the seat belt by operating the motor inside the front seat outer belt.

When the driving support ECU detects a malfunction in the dynamic radar cruise control system and pre-collision system, the malfunction information is sent to the seat belt control ECU, which outputs this DTC.

When DTC B2090 is detected, other DTCs are also stored by the driving support ECU (dynamic radar cruise control system and pre-collision system).

The driving support ECU uses the millimeter wave radar sensor to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU calculates the risk of a collision and operates the pre-collision system when it determines that the risk is high.

The driving support ECU uses the millimeter wave radar sensor to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU calculates the risk of a collision and operates the pre-collision system when it determines that the risk is high.

When a new driving support ECU is installed, it receives vehicle specification information (destination, steering wheel position, 2WD or AWD information, etc.) from the main body ECU, ECM and combination meter assembly and memorizes the information.

DTC C1A02 is stored when the driving support ECU receives the vehicle specification information from the main body ECU and combination meter but cannot record it.

When a new driving support ECU is installed, it receives vehicle specification information (destination, steering wheel position, 2WD or AWD information, etc.) from the main body ECU, ECM and combination meter assembly and memorizes the information.

DTC C1A02 is stored when the driving support ECU receives the vehicle specification information from the main body ECU and combination meter but cannot record it.

The driving support ECU uses the millimeter wave radar sensor to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU sends pre-collision control operation signals.

When the millimeter wave radar sensor is replaced with a new one, it acquires the country specification information from the driving support ECU. Also, when the driving support ECU is replaced with a new one, it receives country specification information from the main body ECU. When country specification information in the sensor, ECU and/or main body ECU do not match, DTC C1A0A is output.

The driving support ECU uses the millimeter wave radar sensor to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU sends pre-collision control operation signals.

When the millimeter wave radar sensor is replaced with a new one, it acquires the country specification information from the driving support ECU. Also, when the driving support ECU is replaced with a new one, it receives country specification information from the main body ECU. When country specification information in the sensor, ECU and/or main body ECU do not match, DTC C1A0A is output.

The driving support ECU uses the millimeter wave radar sensor to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU sends pre-collision control operation signals.

When the driving support ECU receives information that there is a malfunction in the millimeter wave radar sensor, DTC C1A10 is stored.

The driving support ECU uses the millimeter wave radar sensor to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU sends pre-collision control operation signals.

When the driving support ECU receives information that there is a malfunction in the millimeter wave radar sensor, DTC C1A10 is stored.

The driving support ECU uses the millimeter wave radar sensor to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU sends pre-collision control operation signals.

When the vehicle is determined to be driving in a straight line or on a slow curve based on signals from the yaw rate sensor etc., the millimeter wave radar sensor performs a self diagnosis to check if the sensor beam axis is deviated from the vehicle movement direction. When the millimeter wave radar sensor beam axis is deviated, the driving support ECU detects this, and stores DTC C1A11.

After installing a new millimeter wave radar sensor, if the sensor beam axis adjustment is not performed, DTC C1A14 is stored.

The driving support ECU uses the millimeter wave radar sensor to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU sends pre-collision control operation signals.

When the vehicle is determined to be driving in a straight line or on a slow curve based on signals from the yaw rate sensor etc., the millimeter wave radar sensor performs a self diagnosis to check if the sensor beam axis is deviated from the vehicle movement direction. When the millimeter wave radar sensor beam axis is deviated, the driving support ECU detects this, and stores DTC C1A11.

After installing a new millimeter wave radar sensor, if the sensor beam axis adjustment is not performed, DTC C1A14 is stored.

The skid control ECU receives vehicle stability signals from the yaw rate sensor and sends the signals to the driving support ECU and ECM. If the skid control ECU detects that the yaw rate sensor is malfunctioning, the skid control ECU sends a malfunction signal to the driving support ECU, and the driving support ECU stores DTC C1A46. Also, when DTC C1A46 is stored, the skid control ECU stores DTC C1435 at the same time.

The skid control ECU receives vehicle stability signals from the yaw rate sensor and sends the signals to the driving support ECU and ECM. If the skid control ECU detects that the yaw rate sensor is malfunctioning, the skid control ECU sends a malfunction signal to the driving support ECU, and the driving support ECU stores DTC C1A46. Also, when DTC C1A46 is stored, the skid control ECU stores DTC C1435 at the same time.

The skid control ECU receives steering rotation angle information from the steering angle sensor, and sends the information to the driving support ECU through the CAN communication line.

When DTC C1A47 is detected, DTC C1433 is also stored in the "ABS/VSC/TRAC".

The skid control ECU receives steering rotation angle information from the steering angle sensor, and sends the information to the driving support ECU through the CAN communication line.

When DTC C1A47 is detected, DTC C1433 is also stored in the "ABS/VSC/TRAC".

The driving support ECU uses the millimeter wave radar sensor to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU sends pre-collision control operation signals.

These DTCs are stored when a communication malfunction occurs between the sensors and ECUs that detect collisions, or between ECUs that perform the pre-collision control.

The driving support ECU uses the millimeter wave radar sensor to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU sends pre-collision control operation signals.

These DTCs are stored when a communication malfunction occurs between the sensors and ECUs that detect collisions, or between ECUs that perform the pre-collision control.

The driving support ECU sends information on steering angle and steering direction to the millimeter wave radar sensor. The millimeter wave radar sensor then sends information on the presence, distance, and relative speed of objects ahead to the driving support ECU. The driving support ECU sends this information to the ECM and performs cruise control.

Scheme 80

The driving support ECU sends information on steering angle and steering direction to the millimeter wave radar sensor. The millimeter wave radar sensor then sends information on the presence, distance, and relative speed of objects ahead to the driving support ECU. The driving support ECU sends this information to the ECM and performs cruise control.

The driving support ECU sends vehicle speed and vehicle condition information to the millimeter wave radar sensor. The millimeter wave radar sensor then sends information on the presence, distance, and relative speed of objects ahead to the driving support ECU. The driving support ECU sends this information to the ECM and performs cruise control.

Scheme 81

The driving support ECU sends vehicle speed and vehicle condition information to the millimeter wave radar sensor. The millimeter wave radar sensor then sends information on the presence, distance, and relative speed of objects ahead to the driving support ECU. The driving support ECU sends this information to the ECM and performs cruise control.

This circuit supplies power to the seat belt control ECU.

Scheme 82

This circuit supplies power to the seat belt control ECU.