Dtc B2789 No Response From Id Box


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

CLEAR DTC

CHECK FOR DTC

DTC B2789 No Response from ID BOX


DESCRIPTION

This DTC is output when LIN communication between the certification ECU and ID code box stops for 10 seconds or more.

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

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc B2789 No Response From Id Box


INSPECTION PROCEDURE

NOTICE:
  1. When using the intelligent tester with the ignition switch off to troubleshoot:
    Connect the intelligent tester to the vehicle and turn a courtesy light switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.
  2. Inspect the fuses and bulbs for circuits related to this system before performing the following inspection procedure.
HINT:
When communication between the ID code box and certification ECU stops, DTC B2785 is also stored.
1.CLEAR DTC

  1. Clear the DTCs (LandCruiser RM000002S8D045X.html).


NEXT


2.CHECK FOR DTC

  1. Check for DTCs (LandCruiser RM000002S8D045X.html).

    OK:
    DTC B2789 is not output.


NG
Go to step 3
OK

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

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

  1. Disconnect the G38 certification ECU connector.

  1. Disconnect the G37 ID code box connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G38-29 (LIN) - G37-3 (LIN1)
    		Always
    		Below 1 Ω
    G38-29 (LIN) or G37-3 (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, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc B2789 No Response From Id Box

  1. Disconnect the G37 ID code box connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G37-8 (GND) - Body ground
    		Always
    		Below 1 Ω

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    G37-1 (+B) - Body ground
    		Always
    		11 to 14 V
Text in Illustration
*a
Front view of wire harness connector
(to ID Code Box)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.REPLACE ID CODE BOX

  1. Temporarily replace the ID code box with a new one.


NEXT


6.CLEAR DTC

  1. Clear the DTCs (LandCruiser RM000002S8D045X.html).


NEXT


7.CHECK FOR DTC

  1. Check for DTCs (LandCruiser RM000002S8D045X.html).

    OK:
    DTC B2789 is not output.


NG
REPLACE CERTIFICATION ECU
OK

END (ID CODE BOX IS DEFECTIVE)