DTC    B2786    No Response from Steering Lock ECU

for Preparation Click here


DESCRIPTION

The certification ECU also outputs DTCs when communication with the steering lock actuator assembly is interrupted for more than a specified time.

DTC No.
DTC Detection Condition
Trouble Area
B2786
Communication malfunction occurs between the certification ECU and the steering lock actuator assembly.
  1. Harness or connector
  2. Certification ECU
  3. Steering lock actuator assembly

WIRING DIAGRAM


E175958E01


INSPECTION PROCEDURE

HINT:
When using the intelligent tester, repeatedly turn either front door courtesy light switch off-and-on at intervals of 1.5 seconds or less until communication between the intelligent tester and vehicle begins.

NOTICE:
  1. Inspect the fuses for this circuit before starting this inspection procedure.
  2. Refer to the Service Bulletin for the installation position of the certification ECU.

1.CLEAR DTC

  1. Clear DTCs (Click here).


NEXT


2.CHECK FOR DTC

  1. Check for DTCs (Click here).
    Result 
    Result
    		Proceed to
    DTC B2786 is output
    		A
    B2786 and B2785 are output
    		B

    HINT:
    When both B2786 and B2785 are output at the same time, troubleshoot B2785 first.



B
DIAGNOSTIC TROUBLE CODE CHART (Click here)
A


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


    E175959E01

  1. Disconnect the D34 certification ECU connector.

  1. Disconnect the D33 steering lock actuator assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D34-29 (LIN) - D33-5 (LIN)
    		Always
    		Below 1 Ω
    D33-5 (LIN) - Body ground
    		Always
    		10 KΩ or higher

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    D33-5 (LIN) - Body ground
    		Always
    		Below 0.5 V

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Certification ECU)
    *2
    		Front view of wire harness connector
    (to Steering Lock Actuator Assembly)

  1. Reconnect the certification ECU connector.

  1. Reconnect the steering lock actuator assembly connector.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BATTERY AND BODY GROUND)


    E175960E01

  1. Disconnect the D33 steering lock actuator assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    D33-7 (B) - Body ground
    		Always
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D33-1 (GND) - Body ground
    		Always
    		Below 1 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Steering Lock Actuator Assembly)

  1. Reconnect the steering lock actuator assembly connector.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


5.REPLACE STEERING LOCK ACTUATOR ASSEMBLY NORMAL ONE

  1. Replace the steering lock actuator assembly with a normally functioning part (Click here).

  1. Clear DTCs (Click here).


NEXT


6.RECONFIRM DTC OUTPUT

  1. Recheck for DTCs (Click here).
    Result 
    Result
    		Proceed to
    DTC B2786 is not output
    		A
    DTC B2786 is output
    		B



B
REPLACE CERTIFICATION ECU
A

END (STEERING LOCK ACTUATOR ASSEMBLY MALFUNCTION)