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

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

DESCRIPTION

If the communication line (EFIO - IMI) to the certification ECU (smart 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	When the communication line (EFIO - IMI) between ECM and certification ECU (smart key ECU assembly) is stuck high output.	Wire harness or connector Certification ECU (Smart key ECU assembly) ECM

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the certification ECU (smart key ECU assembly) is replaced, register the key (See page ).

PROCEDURE

1.	CHECK DTC OUTPUT

(a) Clear the DTCs (See page ).

(b) 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 DIAGNOSTIC TROUBLE CODE CHART

2.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ECM)

(a) Disconnect the certification ECU (smart key ECU assembly) connector.

(b) Disconnect the ECM connector.

Standard Resistance:

for 2GR-FE

Tester Connection	Condition	Specified Condition
D25-35 (EFIO) - A41-40 (IMI)	Always	Below 1 Ω
D25-35 (EFIO) - Body ground	Always	10 kΩ or higher

for 1AR-FE

Tester Connection	Condition	Specified Condition
D25-35 (EFIO) - A49-11 (IMI)	Always	Below 1 Ω
D25-35 (EFIO) - Body ground	Always	10 kΩ or higher

Standard Voltage:

Tester Connection	Condition	Specified Condition
D25-35 (EFIO) - Body ground	Always	Below 1 V

Text in Illustration

*1	Front view of wire harness connector (to Certification ECU (Smart 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 CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Reconnect the certification ECU (smart key ECU assembly) connector.

(b) Reconnect the ECM connector.

Waveform (Reference):

Item	Content
Terminal No. (Symbol)	D25-35 (EFIO) - D25-15 (E)
Tool Setting	5 V/DIV., 100 msec./DIV.
Condition	Engine switch on (IG)

OK:

Waveform is output normally (see illustration).

Result	Proceed to
NG	A
OK (for 2GR-FE)	B
OK (for 1AR-FE)	C

Text in Illustration

Component with harness connected

(Certification ECU (Smart Key ECU Assembly))

GND

REPLACE ECM

4.	REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Replace the certification ECU (smart key ECU assembly) (See page ).

5.	KEY REGISTRATION

(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 (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE)

REPLACE ECM

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART HINT: If a trouble code is stored during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the "See page" bel ...

Short to GND in Immobiliser System Power Source Circuit (B278A)

DESCRIPTION This DTC is stored when the engine switch power source supply line is open or shorted. DTC No. DTC Detection Condition Trouble Area B2 ...

Other materials about Toyota Venza:

Driver Side Seat Belt Warning Light does not Operate
DESCRIPTION When the ignition switch is ON, the center airbag sensor assembly transmits front seat inner belt status signals to the combination meter assembly through CAN. If the driver seat belt is not fastened, the combination meter assembly blinks the ...

Inspection
INSPECTION PROCEDURE 1. INSPECT FRONT SEAT OUTER BELT ASSEMBLY NOTICE: Do not disassemble the retractor. (a) Before installing the front seat outer belt assembly, check the ELR. (1) When the inclination of the retractor is 15° or less, check that the ...

Installation
INSTALLATION PROCEDURE 1. INSTALL BRAKE PEDAL SUPPORT ASSEMBLY (a) Install the brake pedal support assembly to the instrument panel reinforcement with the bolt. Torque: 19 N·m {195 kgf·cm, 14 ft·lbf} ...