DTC    B2781    Open / Short in Steering Lock ECU

for Preparation Click here


DESCRIPTION

The steering lock ECU and steering lock actuator assembly are supplied as a unit.
The steering lock ECU detects the steering lock position through the signals from the lock and unlock sensors.
The steering lock ECU activates the steering lock motor based on permission signals from the power management control ECU*1 (power source control ECU*2) and the certification ECU.
The diagnosis information of the steering lock ECU is transmitted to the tester via the certification ECU because the steering lock ECU is not connected to the CAN communication system.
  1. *1: for 1KR-FE, 1NR-FE
  2. *2: for 1ND-TV

DTC No.
DTC Detection Condition
Trouble Area
B2781
  1. Steering lock motor drive power circuit malfunction
  2. Both lock and unlock position sensors detect [ON]
  1. Steering lock actuator assembly (Steering lock ECU)
  2. Harness or connector of LIN bus line
  3. Certification ECU

INSPECTION PROCEDURE

HINT:
When the engine switch is off, the power management control ECU*1 or power source control ECU*2 may occasionally go into a non-active state called sleep mode. Therefore, before proceeding with the inspection, it is necessary to perform the following step to wake up the ECU.
Connect the intelligent tester to the DLC3 with the engine switch off, and turn any door courtesy switch ON and OFF at 1.5-second intervals until communication between the intelligent tester and the vehicle begins.
  1. *1: for 1KR-FE, 1NR-FE
  2. *2: for 1ND-TV

1.CHECK DTC (CERTIFICATION ECU)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG).

  1. Turn the tester on

  1. Read the DTCs of the certification ECU by following the prompts displayed on the intelligent tester.

OK:
DTC B2785, which indicates malfunctions in the LIN bus line, is not output.

HINT:
If DTC B2785 is output, inspect the LIN communication system (Click here).



NG
INSPECT COMMUNICATION SYSTEM (LIN) (Click here)
OK

REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) (Click here)