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:

Unlock Position Sensor Signal Circuit
DESCRIPTION The unlock position sensor is one of the components comprising the steering lock ECU (steering lock actuator assembly). The sensor switch contact closes when the steering lock is released. The steering lock release signal is then sent to the ...

Motor Circuit Malfunction (C1521,C1531-C1534,C1554)
DESCRIPTION If the power steering ECU detects these DTCs, it will shut off the motor relay circuit (built into the power steering ECU) and stop power assist. However, power assist continues if DTC C1533 or C1534 is stored. DTC No. D ...

Monitor Drive Pattern
MONITOR DRIVE PATTERN 1. TEST MONITOR DRIVE PATTERN FOR ECT CAUTION: Perform this drive pattern on a level surface and strictly observe the posted speed limits and traffic laws while driving. HINT: Performing this drive pattern is one method to simulate ...