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

GO TO DTC CHART

2.	CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM)

(a) Disconnect the transponder key ECU assembly connector.

(b) Disconnect the ECM connector.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK TRANSPONDER KEY ECU ASSEMBLY (OUTPUT)

(a) Reconnect the transponder key ECU assembly connector.

(b) Reconnect the ECM connector.

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)

REPLACE ECM

4.	REPLACE TRANSPONDER KEY ECU ASSEMBLY

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

5.	REGISTER KEY

(a) Register the key (See page ).

6.	REGISTER ECU COMMUNICATION ID

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

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

END (TRANSPONDER KEY ECU WAS DEFECTIVE)

REPLACE ECM

Engine Immobiliser System Malfunction (B2799)

DESCRIPTION This DTC is stored when one of the following occurs: 1) the ECM detects errors in its own communications with the transponder key ECU assembly; 2) the ECM detects errors in the commun ...

Push Switch / Key Unlock Warning Switch Malfunction (B2780)

DESCRIPTION This DTC is stored if the transponder key ECU assembly does not detect that the unlock warning switch assembly is ON even when the ignition switch is ON. Under normal conditions, the ...

Other materials about Toyota Venza:

SRS Warning Light Remains ON
DESCRIPTION The SRS warning light is located on the combination meter assembly. When the SRS is normal, the SRS warning light comes on for approximately 6 seconds after the ignition switch is turned from off to ON, and then goes off automatically. If ther ...

Diagnosis System
DIAGNOSIS SYSTEM 1. DESCRIPTION The ECM controls the cruise control system of the vehicle. The data and DTCs relating to the cruise control system can be read from the DLC3 of the vehicle. If either DTC or CRUISE OK is not displayed on the multi-informat ...

Lost Communication with Power Source Control (B278C)
DESCRIPTION This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and power management control ECU stops for more than 10 seconds. DTC Code DTC Detection Condition Trouble Area ...