DTC    B2789    No Response from ID BOX

for Preparation Click here


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 No.
DTC Detection Condition
Trouble Area
B2789
No communication between 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. Wire harness or connector
  4. ECU-B2 fuse

WIRING DIAGRAM


B273275E02


INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  2. If the certification ECU (smart key ECU assembly) is replaced, register the key.
  3. If the ID code box (immobiliser code ECU) is replaced, register the ECU code and ECU communication ID.
  4. When using the intelligent tester to troubleshoot with the power 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)

  1. Disconnect the H22 ID code box connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H22-8 (GND) - Body ground
    		Always
    		Below 1 Ω

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    H22-1 (+B) - Body ground
    		Power switch off
    		11 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. Disconnect the H1*1 or H143*2 certification ECU (smart key ECU assembly) connector.

    1. *1: w/ Entry Function
    2. *2: w/o Entry Function

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

    Standard Resistance:
    w/ Entry Function 
    Tester Connection
    		Condition
    		Specified Condition
    H1-29 (LIN) - H22-3 (LIN1)
    		Always
    		Below 1 Ω
    H1-29 (LIN) - Body ground
    		Always
    		10 kΩ or higher
    w/o Entry Function 
    Tester Connection
    		Condition
    		Specified Condition
    H143-29 (LIN) - H22-3 (LIN1)
    		Always
    		Below 1 Ω
    H143-29 (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 (Click here).

  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)