B2071

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

DESCRIPTION

This DTC is output when a malfunction in the stop light control relay circuit. This circuit consists of the distance control ECU and seat belt control ECU. Signals are sent from the distance control ECU to the seat belt control ECU using the CAN communication.





INSPECTION PROCEDURE

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

PROCEDURE

1. CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM)

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

(b) Clear the DTCs Pre-Collision System.

(c) Recheck for DTCs.

OK:

DTC U1101 is not output.

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

2. CHECK DTC OUTPUT (DYNAMIC RADAR CRUISE CONTROL SYSTEM)

(a) Turn the cruise control main switch on.

(b) Drive the vehicle at a speed of 45 km/h (27 mph) or more.

(c) Check DTC for dynamic radar cruise control system Dynamic Radar Cruise Control System.

OK:

Dynamic radar cruise control system DTC is not output.

NG -- GO TO DYNAMIC RADAR CRUISE CONTROL SYSTEM Dynamic Radar Cruise Control System

OK -- REPLACE SEAT BELT CONTROL ECU Removal