DTC    B2786    No Response from Steering Lock ECU

for Preparation Click here


DESCRIPTION

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

DTC Code
DTC Detection Condition
Trouble Area
B2786
No communication between the steering lock ECU (steering lock actuator assembly) and 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


B203744E58


INSPECTION PROCEDURE

NOTICE:
  1. If the certification ECU (smart key ECU assembly) is replaced, register the key.
  2. If the steering lock ECU (steering lock actuator assembly) is replaced, register the ECU code.
  3. When using the intelligent tester to troubleshoot with the engine switch off:
    Connect the intelligent tester to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the intelligent tester and vehicle begins.
1.CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BATTERY AND BODY GROUND)


    B191389E10

  1. Disconnect the E69 ECU connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E69-1 (GND) - Body ground
    		Always
    		Below 1 Ω

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E69-7 (B) - Body ground
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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


    B190855E04

  1. Disconnect the E74 ECU connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E74-10 (LIN) - E69-5 (LIN)
    		Always
    		Below 1 Ω
    E74-10 (LIN) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)

  1. Replace the steering lock ECU (steering lock actuator assembly) (Click here).


NEXT


4.CHECK DTC OUTPUT

  1. Clear the DTC (Click here).

  1. Recheck for DTCs.

    OK:
    DTC B2786 is not output.


NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
OK

END (STEERING LOCK ECU WAS DEFECTIVE)