Toyota Venza manuals

Toyota Venza: Theft Deterrent System Communication Line High Fixation (B279A)

Toyota Venza Service Manual / Theft Deterrent / Keyless Entry / Engine Immobiliser System(w/o Smart Key System) / Theft Deterrent System Communication Line High Fixation (B279A)

DESCRIPTION

If the communication line (EFIO-IMI) to the transponder key ECU assembly is stuck high output (e.g. shorted to +B), the ECM stores this DTC.

DTC No.

DTC Detection Condition

Trouble Area

B279A

Communication line (EFIO-IMI) between the ECM and transponder key ECU assembly is stuck high output.

  • Wire harness or connector
  • Transponder key ECU assembly
  • ECM

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

  • If the transponder key ECU assembly is replaced, register the key and ECU communication ID (See page ).
  • If the ECM is replaced, register the ECU communication ID (See page ).

PROCEDURE

1.

CHECK DTC OUTPUT

(a) Recheck for DTCs (See page ).


HINT:

If any DTCs other than DTC B279A are output, troubleshoot those DTCs first.

Result

Proceed to

DTC B279A is output

A

DTC B279A and other DTCs are output

B


B

GO TO DTC CHART


A

2.

CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM)

(a) Disconnect the transponder key ECU assembly connector.

(b) Disconnect the ECM connector.


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

Standard Resistance:

for 2GR-FE

Tester Connection

Condition

Specified Condition

D22-13 (EFIO) - A41-40 (IMI)

Always

Below 1 Ω

D22-13 (EFIO) - Body ground

Always

10 kΩ or higher

A41-40 (IMI) - Body ground

Always

10 kΩ or higher

for 1AR-FE

Tester Connection

Condition

Specified Condition

D22-13 (EFIO) - A49-11 (IMI)

Always

Below 1 Ω

D22-13 (EFIO) - Body ground

Always

10 kΩ or higher

A49-11 (IMI) - Body ground

Always

10 kΩ or higher

Standard Voltage:

Tester Connection

Condition

Specified Condition

D22-13 (EFIO) - Body ground

Always

Below 1 V

Text in Illustration

*1

Front view of wire harness connector

(to Transponder Key ECU Assembly)

*2

Front view of wire harness connector

(to ECM)

*3

for 2GR-FE

*4

for 1AR-FE


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

3.

CHECK TRANSPONDER KEY ECU ASSEMBLY (OUTPUT)

(a) Reconnect the transponder key ECU assembly connector.

(b) Reconnect the ECM connector.

(c) Using an oscilloscope, check the waveform.

Waveform 1 (Reference):

Item

Content

Terminal No. (Symbols)

D22-13 (EFIO) - D22-16 (GND)

Tool Setting

2 V/DIV., 1 s./DIV.

Condition

Ignition switch ON

Result:

Result

Proceed to

NG

A

OK (for 2GR-FE)

B

OK (for 1AR-FE)

C

Text in Illustration

*1

Component with harness connected

(Transponder Key ECU Assembly)



B

REPLACE ECM


C

REPLACE ECM


A

4.

REPLACE TRANSPONDER KEY ECU ASSEMBLY

(a) Replace the transponder key ECU assembly (See page ).



NEXT

5.

REGISTER KEY

(a) Register the key (See page ).



NEXT

6.

REGISTER ECU COMMUNICATION ID

(a) Register the ECU communication ID (See page ).



NEXT

7.

CHECK DTC OUTPUT

(a) Clear the DTCs (See page ).


(b) Recheck for DTCs (See page ).


OK:

DTC B279A is not output.

Result

Proceed to

OK

A

NG (for 2GR-FE)

B

NG (for 1AR-FE)

C


A

END (TRANSPONDER KEY ECU WAS DEFECTIVE)


B

REPLACE ECM


C

REPLACE ECM

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