PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:B2071

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

*1	Master Cylinder Solenoid (Skid Control ECU)
*2	Seat Belt Control ECU
*3	CAN Communication Line

PROCEDURE

1. CHECK DTC (CAN COMMUNICATION SYSTEM)

   
   

   1. Use the intelligent tester to check if the CAN communication system is functioning normally (See page for LHD, Click here for RHD).

      Result

      Result	Proceed to
      OK (DTC U0122 is not output)	A
      NG (for LHD)	B
      NG (for RHD)	C

      Tech Tips

      DTC U0122: Lost Communication with Skid Control ECU

   
   

   B

   GO TO CAN COMMUNICATION SYSTEM Click here

   C

   GO TO CAN COMMUNICATION SYSTEM Click here

   A

2. CHECK DTC (VEHICLE STABILITY CONTROL SYSTEM)

   
   

   1. Using the intelligent tester, enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Code.

   2. Clear the DTCs Click here.

   3. Check for DTCs Click here.

      OK
      DTC C1380 is not output.

      Tech Tips

      DTC C1380: Stop Light Control Relay Malfunction

   
   

   NG

   GO TO VEHICLE STABILITY CONTROL SYSTEM (DTC C1380) Click here

   OK

3. CHECK DTC (PRE-CRASH SAFETY SYSTEM)

   
   

   1. Using the intelligent tester, enter the following menus: Body / Pre-Crash / Trouble Code.

   2. Clear the DTCs Click here.

   3. Check for DTCs Click here.

      Result

      Result	Proceed to
      OK (DTC B2071 is not output)	A
      NG (for LHD)	B
      NG (for RHD)	C

   
   

   A

   USE SIMULATION METHOD TO CHECK Click here

   B

   REPLACE SEAT BELT CONTROL ECU Click here

   C

   REPLACE SEAT BELT CONTROL ECU Click here