Pre-Collision System (Diagnostic Codes): Overview Lexus LX J200

DESCRIPTION

The seat belt control ECU receives information from the master cylinder solenoid (skid control ECU) via the CAN communication line and tightens the seat belt by operating the motor in the front seat outer belt assembly RH or LH.

Scheme 84

Scheme 85

The seat belt control ECU receives information from the master cylinder solenoid (skid control ECU) via the CAN communication line and tightens the seat belt by operating the motor in the front seat outer belt assembly RH or LH.

The seat belt control ECU receives information from the master cylinder solenoid (skid control ECU) via the CAN communication line and tightens the seat belt by operating the motor in the front seat outer belt assembly RH or LH.

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

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.

Scheme 86

This DTC is stored when there is a malfunction in the communication from the millimeter wave radar sensor. This DTC is also stored when the vehicle information sent from the millimeter wave radar sensor is abnormal.

In these cases, perform initialization so that the millimeter wave radar sensor recognizes the vehicle information.

This DTC is stored when the beam axis of the millimeter wave radar sensor is not aligned with the direction the vehicle is traveling. If the beam axis adjustment is not performed after installing a new millimeter wave radar sensor, the pre-collision system DTC B2056 is output, and when the vehicle speed is 40 km/h (25 mph) or more, the dynamic radar cruise control system DTC P1572 is output.

This DTC is stored when the vehicle is driven at a vehicle speed of 5 km/h (3 mph) or more and a malfunction occurs in the yaw rate sensor.

This circuit consists of the yaw rate sensor and seat belt control ECU.

Scheme 87

This DTC is stored when a malfunction occurs in the steering angle sensor.

Scheme 88

The seat belt control ECU receives vehicle speed information from the ECM and master cylinder solenoid (skid control ECU) via CAN communication.

The ECM receives vehicle speed information from the master cylinder solenoid (skid control ECU) through the combination meter.

This DTC is stored when there is a difference in the vehicle speed information from the ECM and master cylinder solenoid (skid control ECU).

Scheme 89

This DTC is stored when a malfunction in the vehicle stability control system is detected. This circuit consists of the master cylinder solenoid (skid control ECU) and seat belt control ECU. Signals are sent from the master cylinder solenoid (skid control ECU) via the CAN communication line.

Scheme 90

When the master cylinder solenoid (skid control ECU) detects a malfunction in the VSC warning buzzer circuit, a malfunction signal is sent to the seat belt control ECU, and this DTC is stored.

This DTC is stored when the master cylinder solenoid (skid control ECU) detects that the brake light relay is malfunctioning and transmits this to the seat belt control ECU via CAN communication.

Scheme 91

This DTC is stored when there is a malfunction in the front seat inner belt buckle switch circuit for the driver side. The seat belt control ECU receives buckle switch condition information from the center airbag sensor via the CAN communication line and controls the pre-collision system.

When DTC B2074 is stored, DTC B1655 is also stored.

Scheme 92

This DTC is stored when there is a malfunction in the front seat inner belt buckle switch circuit for the passenger side. The seat belt control ECU receives buckle switch condition information from the occupant classification ECU and the center airbag sensor via the CAN communication line and controls the pre-collision system.

When DTC B2075 is stored, DTC B1650 is also output.

The seat belt control ECU receives signals from the master cylinder solenoid (skid control ECU) and the center airbag sensor via the CAN communication line.

The distance control ECU receives signals from the ECM via the CAN communication line.

The millimeter wave radar sensor and the distance control ECU transmit the data for general vehicle control and diagnosis function via the CAN communication line.

This circuit supplies power to the seat belt control ECU when the engine switch is on (IG).

Scheme 93

See also:
• REMOVAL