Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJKO
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM(for Entry Function): B27A7; Open in Inside Luggage Compartment Electrical Key Oscillator Circuit; 2016 - 2020 MY Sienna [12/2015 -        ]

DTC

B27A7

Open in Inside Luggage Compartment Electrical Key Oscillator Circuit

DESCRIPTION

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

DTC B27A7 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 rear floor) terminals (between CLG7 and CLG6, or CG7B and CLGB).

DTC No.

DTC Detection Condition

Trouble Area

B27A7

Open circuit detected between the certification ECU (smart key ECU assembly) and indoor electrical key oscillator (for rear floor) terminals (between CLG7 and CLG6, or CG7B and CLGB).

  • Indoor electrical key oscillator (for rear 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 2016 - 2020 MY Sienna [12/2015 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM(for Entry Function): HOW TO PROCEED WITH TROUBLESHOOTING ). 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 rear floor).

OK:

Connectors are properly connected.

NG

CONNECT CONNECTORS PROPERLY

OK

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 rear floor) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D88-26 (CLG7) - L12-1 (CLG6)

Always

Below 1 Ω

D88-27 (CG7B) - L12-2 (CLGB)

Always

Below 1 Ω

D88-26 (CLG7) - Body ground

Always

10 kΩ or higher

D88-27 (CG7B) - Body ground

Always

10 kΩ or higher

L12-1 (CLG6) - Body ground

Always

10 kΩ or higher

L12-2 (CLGB) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

D88-15 (E) - Body ground

Always

Below 1 Ω

OK:

Tester Connection

Condition

Specified Condition

D88-26 (CLG7) - D88-15 (E)

  • Engine switch off
  • All doors closed
  • Key not in cabin
  • Door outside handle assembly (lock sensor) not touched

No pulse generation

D88-26 (CLG7) - D88-15 (E)

  • Engine switch off
  • All doors closed
  • Key not in cabin
  • Door outside handle assembly (lock sensor) touched

Pulse generation

D88-27 (CG7B) - D88-15 (E)

  • Engine switch off
  • All doors closed
  • Key not in cabin
  • Door outside handle assembly (lock sensor) not touched

No pulse generation

D88-27 (CG7B) - D88-15 (E)

  • Engine switch off
  • All doors closed
  • Key not in cabin
  • Door outside handle assembly (lock sensor) touched

Pulse generation

Text in Illustration

*a

Component with harness connected

(Certification ECU (Smart Key ECU Assembly))

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2018 - 2020 MY Sienna [11/2017 -        ]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL )

OK

4.

REPLACE INDOOR ELECTRICAL KEY OSCILLATOR (for Rear Floor)

(a) Replace the indoor electrical key oscillator (for rear floor) (See page 2016 - 2020 MY Sienna [12/2015 -        ]; THEFT DETERRENT / KEYLESS ENTRY: ELECTRICAL KEY OSCILLATOR(for Rear Floor): REMOVAL ).

NEXT

5.

CHECK DTC OUTPUT

(a) Clear the DTCs (See page 2016 - 2020 MY Sienna [12/2015 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM(for Entry Function): DTC CHECK / CLEAR ).

(b) Recheck for DTCs.

OK:

DTC B27A7 is not output.

OK

END (INDOOR ELECTRICAL KEY OSCILLATOR WAS DEFECTIVE)

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2018 - 2020 MY Sienna [11/2017 -        ]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL )