Dtc B2789 No Response From Id Box

Power Source Network. Land Cruiser. Urj200, 202 Grj200 Vdj200
Networking. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ID CODE BOX)

CHECK HARNESS AND CONNECTOR (ID CODE BOX - BATTERY AND BODY GROUND)

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

CHECK FOR DTC

DTC B2789 No Response from ID BOX


DESCRIPTION

This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) stops for 10 seconds or more.

DTC Code
DTC Detection Condition
Trouble Area
B2789
No communication between the certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) for 10 seconds or more.
  1. ID code box (immobiliser code ECU)
  2. Certification ECU (smart key ECU assembly)
  3. Harness or connector

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Networking.Lin Communication System. Dtc B2789 No Response From Id Box


INSPECTION PROCEDURE

NOTICE:
When using the intelligent tester with the ignition switch off to troubleshoot:
Connect the intelligent tester to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.
HINT:
DTC B2785 is stored when the communication between the ID code box (immobiliser code ECU) and certification ECU (smart key ECU assembly) stops.
1.CLEAR DTC

  1. Clear the DTC (Click here).


NEXT


2.CHECK FOR DTC

  1. Recheck for DTCs (Click here).

    Result
    Result
    		Proceed to
    DTC B2789 is output
    		A
    DTC B2789 is not output
    		B


B
USE SIMULATION METHOD TO CHECK (Click here)
A


3.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ID CODE BOX)
Land Cruiser. Urj200, 202 Grj200 Vdj200.Networking.Lin Communication System. Dtc B2789 No Response From Id Box

  1. Disconnect the E29 ECU connector.

  1. Disconnect the E28 box connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E29-10 (LIN) - E28-3 (LIN1)
    		Always
    		Below 1 Ω
    E29-10 (LIN) or E28-3 (LIN1) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (ID CODE BOX - BATTERY AND BODY GROUND)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Networking.Lin Communication System. Dtc B2789 No Response From Id Box

  1. Disconnect the E28 box connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E28-8 (GND) - Body ground
    		Always
    		Below 1 Ω
    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E28-1 (+B) - Body ground
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

  1. Temporarily replace the ID code box (immobiliser code ECU) with a new or normally functioning one.

  1. Clear the DTC (Click here).


NEXT


6.CHECK FOR DTC

  1. Recheck for DTCs (Click here).

    Result
    Result
    		Proceed to
    DTC B2789 is output
    		A
    DTC B2789 is not output
    		B


B
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
A

END (ID CODE BOX IS DEFECTIVE)