Dtc B2789 No Response From Id Box

Communication System. Camry. Acv40 Gsv40
Multiplex Communication. Camry. Acv40 Gsv40

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

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

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

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

CHECK DTC OUTPUT

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 more than 10 seconds.

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 more than 10 seconds.
  1. ID code box (Immobiliser code ECU)
  2. Certification ECU (Smart key ECU assembly)
  3. Wire harness or connector

WIRING DIAGRAM


Camry. Acv40 Gsv40.Multiplex Communication.Lin Communication System. Dtc B2789 No Response From Id Box


INSPECTION PROCEDURE

NOTICE:
  1. If the certification ECU (smart key ECU assembly) is replaced, register the key.
  2. If the ID code box (immobiliser code ECU) is replaced, register the ECU code and ECU communication ID.
  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 (ID CODE BOX - BATTERY AND BODY GROUND)


    Camry. Acv40 Gsv40.Multiplex Communication.Lin Communication System. Dtc B2789 No Response From Id Box

  1. Disconnect the E68 ECU connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E68-8 (GND) - Body ground
    		Always
    		Below 1 Ω
    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E68-1 (+B) - Body ground
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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


    Camry. Acv40 Gsv40.Multiplex Communication.Lin Communication System. Dtc B2789 No Response From Id Box

  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) - E68-3 (LIN1)
    		Always
    		Below 1 Ω
    E74-10 (LIN) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

  1. Replace the ID code box (immobiliser code ECU).


NEXT


4.CHECK DTC OUTPUT

  1. Clear the DTC (CAMRY_ACV40 RM000002XHS00KX.html).

  1. Recheck for DTCs.

    OK:
    DTC B2789 is not output.


NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
OK

END (ID CODE BOX (IMMOBILISER CODE ECU) WAS DEFECTIVE)