B2071

PRE-COLLISION: PRE-COLLISION SYSTEM: B2071: Stop Light Control Relay Malfunction
B2071 - Stop Light Control Relay Malfunction

DESCRIPTION

This DTC is stored when a malfunction in the stop light operation relay circuit of 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.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC (CAN COMMUNICATION SYSTEM)

(a) Use the Techstream to check if the CAN communication system is functioning normally Initial Inspection and Diagnostic Overview.

OK:

DTC U0122 is not output.

HINT
DTC U0122: Lost Communication with Skid Control ECU

NG -- GO TO CAN COMMUNICATION SYSTEM (DTC U0122) U0122
OK -- Continue to next step.

2. CHECK DTC (VEHICLE STABILITY CONTROL SYSTEM)

(a) Using the Techstream, enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Code.

(b) Clear the DTCs Pre-Collision System.

(c) Check for DTCs Pre-Collision System.

OK:

DTC C1380 is not output.

HINT
DTC C1380: Stop Light Control Relay Malfunction

NG -- GO TO VEHICLE STABILITY CONTROL SYSTEM (DTC C1380) C1380
OK -- Continue to next step.

3. CHECK DTC (PRE-COLLISION SYSTEM)

(a) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision / Trouble Code.

(b) Clear the DTCs Pre-Collision System.

(c) Check for DTCs Pre-Collision System.

OK:

DTC B2071 is not output.

NG -- REPLACE SEAT BELT CONTROL ECU Removal

OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting