B2057

PRE-COLLISION: PRE-COLLISION SYSTEM: B2057: Yaw Rate Sensor
B2057 - Yaw Rate Sensor

DESCRIPTION

This DTC is stored when a malfunction in the yaw rate and acceleration sensor is detected. This circuit consists of the yaw rate and acceleration sensor and seat belt control ECU. Signals are sent from the yaw rate and acceleration sensor using CAN communication.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* When the seat belt control ECU is replaced with a new one, Initialization must be performed Pre-Collision System.
* When the distance control ECU is replaced with a new one, Initialization must be performed Installation.

PROCEDURE

1. CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM)

(a) Clear the DTCs Dynamic Radar Cruise Control System.

(b) Turn the cruise control main switch on.

(c) Recheck for DTCs.

OK:

CAN communication system DTC is not output.

NG -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
OK -- Continue to next step.

2. CHECK DTC OUTPUT (VEHICLE STABILITY CONTROL SYSTEM)

(a) Turn the engine switch off.

(b) Start the engine.

(c) Drive the vehicle at a speed of 30 km/h (19 mph) or more, turn the steering wheel, and decelerate the vehicle (depress the brake pedal).

(d) Check for vehicle stability control system DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

Vehicle stability control system DTC is not output.

NG -- GO TO VEHICLE STABILITY CONTROL SYSTEM Vehicle Stability Control System
OK -- Continue to next step.

3. REPLACE DISTANCE CONTROL ECU

(a) Replace the distance control ECU Removal.

(b) Initialize the distance control ECU Installation.

NEXT -- Continue to next step.

4. CHECK DTC OUTPUT (PRE-COLLISION SYSTEM)

(a) Clear the DTCs Pre-Collision System.

(b) Drive the vehicle.

(c) Recheck for DTCs.

OK:

DTC B2057 is not output.

NG -- REPLACE SEAT BELT CONTROL ECU Components

OK -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) How To Proceed With Troubleshooting