Dtc B279A Theft Deterrent System Communication Line High Fixation

Vehicle Interior. Corolla. Zre142 Aze141
Theft Deterrent Keyless Entry. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC OUTPUT

CHECK HARNESS AND CONNECTOR (ID CODE BOX - ECM)

CHECK ECM (INPUT)

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

REGISTER ECU CODE

REGISTER ECU COMMUNICATION ID

CHECK DTC OUTPUT

DTC B279A Theft Deterrent System Communication Line High Fixation


DESCRIPTION

If the communication line (EFIO-IMI) to the ID code box (immobiliser code ECU) is stuck on HI output, the ECM outputs this DTC.

DTC No.
DTC Detection Condition
Trouble Area
B279A
When communication line (EFIO-IMI) between ECM and the immobiliser code ECU is stuck on HI output
  1. Wire harness or connector
  2. ID code box (immobiliser code ECU)
  3. ECM

WIRING DIAGRAM


Corolla. Zre142 Aze141.Theft Deterrent Keyless Entry.Smart Key System (For Entry Function). Dtc B279A Theft Deterrent System Communication Line High Fixation


INSPECTION PROCEDURE

NOTICE:
  1. If the ID code box (immobiliser code ECU) is replaced, register the ECU code and ECU communication ID (COROLLA_ZRE142 RM000000QYF05AX.html).
  2. If the ECM is replaced, register the ECU communication ID (COROLLA_ZRE142 RM000000QYF05AX.html).
1.CHECK DTC OUTPUT

  1. Recheck for DTCs (COROLLA_ZRE142 RM000001GV807OX.html).

    HINT:
    If any DTCs other than DTC B279A are output, troubleshoot those DTCs first.
    Result:
    Result
    		Proceed to
    DTC B279A is output
    		A
    DTC B279A and other DTCs are output
    		B


B
GO TO DTC CHART (COROLLA_ZRE142 RM000000QY6060X.html)
A


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

  1. Disconnect the ID code box (immobiliser code ECU) connector.



  1. Disconnect the ECM connector.


    Corolla. Zre142 Aze141.Theft Deterrent Keyless Entry.Smart Key System (For Entry Function). Dtc B279A Theft Deterrent System Communication Line High Fixation

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E22-6 (EFIO) - A50-11 (IMI)
    		Always
    		Below 1 Ω
    E22-6 (EFIO) - Body ground
    		Always
    		10 kΩ or higher
    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E22-6 (EFIO) - Body ground
    		Always
    		Below 1 V
    A50-11 (IMI) - Body ground
    		Always
    		Below 1 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK ECM (INPUT)

  1. Reconnect the ID code box (immobiliser code ECU) connector.

  1. Reconnect the ECM connector.



  1. Measure the waveform.


    Corolla. Zre142 Aze141.Theft Deterrent Keyless Entry.Smart Key System (For Entry Function). Dtc B279A Theft Deterrent System Communication Line High Fixation

    Waveform (Reference):
    Item
    		Content
    Terminal No. (Symbols)
    		A50-11 (IMI) - B31-105 (E1)
    Tool Setting
    		10 V/DIV., 100 msec./DIV.
    Condition
    		Engine switch on (IG)


NG
Go to step 4
OK

REPLACE ECM (COROLLA_ZRE142 RM000001CN0030X.html)

4.REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

  1. Replace the ID code box (immobiliser code ECU) (COROLLA_ZRE142 RM000003G05004X.html).


NEXT


5.REGISTER ECU CODE

  1. Register the ECU code (COROLLA_ZRE142 RM000000QYF05AX.html).


NEXT


6.REGISTER ECU COMMUNICATION ID

  1. Register the ECU communication ID (COROLLA_ZRE142 RM000000QYF05AX.html).


NEXT


7.CHECK DTC OUTPUT

  1. Clear the DTCs (COROLLA_ZRE142 RM000001GV807OX.html).

  1. Recheck for DTCs.

    OK:
    B279A is not reoutput.


NG
REPLACE ECM (COROLLA_ZRE142 RM000001CN0030X.html)
OK

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