DTC    B2786    No Response from Steering Lock ECU

for Preparation Click here


DESCRIPTION

This DTC is output when LIN communication between the certification ECU (smart key ECU assembly) and the steering lock ECU (steering lock actuator assembly) stops for more than 10 seconds.

DTC No.
DTC Detection Condition
Trouble Area
B2786
No communication between the steering lock ECU (steering lock actuator assembly) and the certification ECU (smart key ECU assembly) for more than 10 seconds
  1. Steering lock ECU (steering lock actuator assembly)
  2. Certification ECU (smart key ECU assembly)
  3. Wire harness or connector

WIRING DIAGRAM


B191390E03


INSPECTION PROCEDURE

NOTICE:
  1. If the certification ECU (smart key ECU assembly) is replaced, register the keys and ECU communication ID (Click here).
  2. If the steering lock ECU (steering lock actuator assembly) is replaced, register the ECU code (Click here).
1.CLEAR DTC
  1. Clear the DTC (Click here).


NEXT


2.CHECK FOR DTC
  1. Recheck for the DTC (Click here).

    OK:
    B2786 is not output.


NG
Go to step 3
OK

USE SIMULATION METHOD TO CHECK (Click here)  

3.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - STEERING LOCK ECU)


    B164470E04
  1. Disconnect the E36 and E39 ECU connectors.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    Condition
    Specified Condition
    E36-10 (LIN) - E39-5 (LIN)
    Always
    Below 1 Ω
    E36-10 (LIN) - Body ground
    Always
    10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU BATTERY VOLTAGE AND GROUND)


    B191389E02
  1. Measure the resistance and voltage according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    Condition
    Specified Condition
    E39-1 (GND) - Body ground
    Always
    Below 1 Ω

    Standard Voltage:
    Tester Connection
    Condition
    Specified Condition
    E39-7 (B) - Body ground
    Always
    11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.REPLACE STEERING LOCK ECU
  1. Replace the steering lock ECU (steering lock actuator assembly).


NEXT


Go to step 4

6.CHECK FOR DTC
  1. Clear the DTC (Click here).

  1. Recheck for the DTC.

    OK:
    B2786 is not output.


NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (Click here)
OK

END (STEERING LOCK ECU IS DEFECTIVE)