Toyota Venza: Open in Front Floor Electrical Key Oscillator Circuit (B27A5)

Toyota Venza Service Manual / Theft Deterrent / Keyless Entry / Smart Key System(for Entry Function) / Open in Front Floor Electrical Key Oscillator Circuit (B27A5)

DESCRIPTION

The certification ECU (smart key ECU assembly) generates a request signal and sends it to the indoor electrical key oscillator (for front floor). To detect the key inside the cabin, the indoor electrical key oscillator (for front floor) creates a detection area in the cabin.

DTC B27A5 is detected by the certification ECU (smart key ECU assembly) when an open circuit occurs between the certification ECU (smart key ECU assembly) and indoor electrical key oscillator (for front floor) terminals (between CLG5 and CLG3, or CG5B and CLGB).

DTC No.	DTC Detection Condition	Trouble Area
B27A5	Open circuit detected between the certification ECU (smart key ECU assembly) and indoor electrical key oscillator (for front floor) terminals (between CLG5 and CLG3, or CG5B and CLGB).	Indoor electrical key oscillator (for front floor) Certification ECU (smart key ECU assembly) Wire harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The smart key system (for entry function) uses a multiplex communication system (LIN communication system) and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting (See page ). Troubleshoot the smart key system (for entry
function) after confirming that the communication system is functioning properly.

PROCEDURE

1.	CHECK CONNECTOR CONNECTION CONDITION

(a) Turn the engine switch off.

(b) Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and the indoor electrical key oscillator (for front floor).

OK:

Connectors are properly connected.

CONNECT CONNECTORS PROPERLY

2.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - INDOOR ELECTRICAL KEY OSCILLATOR)

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

(b) Disconnect the indoor electrical key oscillator (for front floor) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D25-7 (CLG5) - D27-1 (CLG3)	Always	Below 1 Ω
D25-8 (CG5B) - D27-3 (CLGB)	Always	Below 1 Ω
D25-7 (CLG5) - Body ground	Always	10 kΩ or higher
D25-8 (CG5B) - Body ground	Always	10 kΩ or higher
D27-1 (CLG3) - Body ground	Always	10 kΩ or higher
D27-3 (CLGB) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Certification ECU (Smart Key ECU Assembly))

Front view of wire harness connector

(to Indoor Electrical Key Oscillator (for Front Floor))

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (INDOOR ELECTRICAL KEY OSCILLATOR SIGNAL OUTPUT)

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

(b) Measure the resistance and check for pulses according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D25-15 (E) - Body ground	Always	Below 1 Ω

Standard:

Tester Connection	Condition	Specified Condition
D25-7 (CLG5) - D25-15 (E)	Engine switch off All door closed Key not in cabin Door outside handle assembly (lock sensor) not touched	No pulse generation
D25-7 (CLG5) - D25-15 (E)	Engine switch off All door closed Key not in cabin Door outside handle assembly (lock sensor) touched	Pulse generation
D25-8 (CG5B) - D25-15 (E)	Engine switch off All door closed Key not in cabin Door outside handle assembly (lock sensor) not touched	No pulse generation
D25-8 (CG5B) - D25-15 (E)	Engine switch off All door closed Key not in cabin Door outside handle assembly (lock sensor) touched	Pulse generation

Text in Illustration

*1	Component with harness connected (Certification ECU (Smart Key ECU Assembly))

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

4.	REPLACE INDOOR ELECTRICAL KEY OSCILLATOR (for Front Floor)

(a) Replace the indoor electrical key oscillator (for front floor) (See page ).

5.	CHECK DTC OUTPUT

(a) Clear the DTCs (See page ).

(b) Recheck for DTCs.

OK:

DTC B27A5 is not output.

END (INDOOR ELECTRICAL KEY OSCILLATOR WAS DEFECTIVE)

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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