Dtc B2789 No Response From Id Box

Securities. Lexus Gs430, Gs300. Uzs190 Grs190
Engine Immobiliser. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

CHECK WIRE HARNESS (CERTIFICATION ECU - IMMOBILISER CODE ECU)

CHECK OPERATION OF CERTIFICATION ECU

DTC B2789 No Response from ID BOX


DESCRIPTION

This DTC is output when the certification ECU does not receive LIN communication from the immobiliser code ECU for 10 seconds.

DTC No.
DTC Detection Condition
Trouble Area
B2789
Certification ECU does not receive LIN communication from immobiliser code ECU
  1. Open or short in wire harness between ECUs
  1. Wire harness
  2. Immobiliser code ECU
  3. Certification ECU

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System. Dtc B2789 No Response From Id Box


INSPECTION PROCEDURE

1.CHECK FOR DTC

  1. Delete the DTC (Click here).

  1. Recheck for DTC.

    Result:
    Result
    		Proceed to
    B2789 output reoccurs
    		A
    B2789 output does not reoccur
    		B


B
NORMAL
A


2.CHECK WIRE HARNESS (CERTIFICATION ECU - IMMOBILISER CODE ECU)

Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System. Dtc B2789 No Response From Id Box

  1. Disconnect the V28 and L58 connectors.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    V28-10 (LIN) - L58-3 (LIN1)
    		Below 1 Ω
    V28-10 (LIN) or L58-3 (LIN1) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3.CHECK OPERATION OF CERTIFICATION ECU

  1. After replacing the certification ECU with a normal one, check for DTC.

    Result:
    Result
    		Proceed to
    B2789 output reoccurs
    		A
    B2789 output does not reoccur
    		B


B
REPLACE CERTIFICATION ECU
A

REPLACE IMMOBILISER CODE ECU