Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJKL
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM(for Entry Function): B27A2; Open in Front Passenger Side Electrical Antenna Circuit; 2016 - 2020 MY Sienna [12/2015 -        ]

DTC

B27A2

Open in Front Passenger Side Electrical Antenna Circuit

DESCRIPTION

The certification ECU (smart key ECU assembly) generates a request signal and sends it to the door electrical key oscillator built into the front door outside handle assembly (for front passenger side) at 0.25-second intervals. To detect a key near the front passenger door, the front door outside handle assembly (for front passenger side) creates a detection area with a radius of approximately 1.0 m (3.28 ft.) from the front passenger door at 0.25-second intervals.

DTC B27A2 is detected by the certification ECU (smart key ECU assembly) if an open circuit is detected between the certification ECU (smart key ECU assembly) and front door outside handle assembly (for front passenger side) terminals (between CLG2 and ANT1, or CG2B and ANT2).

DTC No.

DTC Detection Condition

Trouble Area

B27A2

Open circuit detected between the certification ECU (smart key ECU assembly) and front door outside handle assembly (for front passenger side) terminals (between CLG2 and ANT1, or CG2B and ANT2).

  • Front door outside handle assembly (for front passenger side)
  • 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 front door outside handle assembly (for front passenger side).

OK:

Connectors are properly connected.

NG

CONNECT CONNECTORS PROPERLY

OK

2.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - FRONT DOOR OUTSIDE HANDLE)

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

(b) Disconnect the front door outside handle assembly (for front passenger side) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D88-5 (CLG2) - o1-6 (ANT1)

Always

Below 1 Ω

D88-6 (CG2B) - o1-3 (ANT2)

Always

Below 1 Ω

D88-5 (CLG2) - Body ground

Always

10 kΩ or higher

D88-6 (CG2B) - Body ground

Always

10 kΩ or higher

o1-6 (ANT1) - Body ground

Always

10 kΩ or higher

o1-3 (ANT2) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK HARNESS AND CONNECTOR (FRONT DOOR OUTSIDE HANDLE - BODY GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

o1-2 (GND) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Front view of wire harness connector

(to Front Door Outside Handle Assembly (for Front Passenger Side))

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (DOOR 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

D88-5 (CLG2) - D88-15 (E)

  • Engine switch off
  • All doors closed
  • Key not in cabin

No pulse generation

D88-5 (CLG2) - D88-15 (E)

  • Engine switch off
  • All doors closed
  • Key not in cabin
  • All doors locked by wireless lock function

Pulse generation

D88-6 (CG2B) - D88-15 (E)

  • Engine switch off
  • All doors closed
  • Key not in cabin

No pulse generation

D88-6 (CG2B) - D88-15 (E)

  • Engine switch off
  • All doors closed
  • Key not in cabin
  • All doors locked by wireless lock function

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

5.

REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY (for Front Passenger Side)

(a) Replace the front door outside handle assembly (for front passenger side) (See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; DOOR / HATCH: SLIDE DOOR: DISASSEMBLY 2018 MY Sienna [11/2017 - 08/2018]; DOOR / HATCH: SLIDE DOOR: DISASSEMBLY 2019 - 2020 MY Sienna [08/2018 -        ]; DOOR / HATCH: SLIDE DOOR: DISASSEMBLY ).

NEXT

6.

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 B27A2 is not output.

OK

END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY 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 )