Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001G1ZK
Model Year Start: 2019 Model: RAV4 Prod Date Range: [11/2018 -           ]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, Gasoline Model): B27A8; Open in Outside Luggage Compartment Electrical Key Antenna Circuit; 2019 - 2024 MY RAV4 [11/2018 -        ]

DTC

B27A8

Open in Outside Luggage Compartment Electrical Key Antenna Circuit

DESCRIPTION

The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the electrical key antenna (outside luggage compartment). For the electrical key antenna (outside luggage compartment) to detect when the electrical key transmitter sub-assembly is brought close to the vehicle, the received request signal is transmitted within approximately 1 m (3.28 ft.) of the back door. DTC B27A8 is stored by the certification ECU (smart key ECU assembly) when an open is detected between the certification ECU (smart key ECU assembly) and electrical key antenna (outside luggage compartment) (between terminals CLG8 and ANTE8, or terminals CG8B and CLGB).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B27A8

Open in Outside Luggage Compartment Electrical Key Antenna Circuit

An open is detected in the circuit between the certification ECU (smart key ECU assembly) and electrical key antenna (outside luggage compartment) (CLG8 - ANTE8, CG8B - CLGB) (1 trip detection logic*).
  • Certification ECU (smart key ECU assembly)
  • Electrical key antenna (outside luggage compartment)
  • Harness or connector

DTC Output Confirmation Operation:

  • Any time
  • *: Only output while a malfunction is present and the engine switch is on (IG).

Vehicle Condition and Fail-safe Operation when Malfunction Detected

Vehicle Condition when Malfunction Detected

Fail-safe Operation when Malfunction Detected

Entry lock/unlock operation cannot be performed for back door

-

Related Data List and Active Test

DTC No.

Data List and Active Test

B27A8

Key diagnostic mode can be used to perform troubleshooting

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The smart key system (for Entry Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Entry Function) after confirming that the communication systems are functioning properly.

    Click here 2019 - 2020 MY RAV4 [11/2018 - 08/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING 2021 MY RAV4 [08/2020 - 12/2021]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING 2022 - 2023 MY RAV4 [12/2021 - 10/2023]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING 2024 MY RAV4 [10/2023 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING

  • When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
  • Before replacing the certification ECU (smart key ECU assembly), refer to Registration.

    Click here 2019 MY RAV4 [11/2018 - 10/2019]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION 2020 MY RAV4 [10/2019 - 08/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION 2021 MY RAV4 [08/2020 - 12/2021]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION 2022 - 2024 MY RAV4 [12/2021 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

PROCEDURE

1.

CHECK CONNECTOR CONNECTION

(a) Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and electrical key antenna (outside luggage compartment).

OK:

Connectors are properly connected.

NG

CONNECT CONNECTORS PROPERLY
OK

2.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT))

(a) Disconnect the M7 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the Q15 electrical key antenna (outside luggage compartment) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

M7-13 (CLG8) - Q15-2 (ANTE8)

Always

Below 1 Ω

M7-12 (CG8B) - Q15-1 (CLGB)

Always

Below 1 Ω

(d) Reconnect the M7 certification ECU (smart key ECU assembly) connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT))

*a

Component with harness connected

(Certification ECU (Smart Key ECU Assembly))

*b

Waveform 1

(a) Using an oscilloscope, check the waveform.

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

M7-13 (CLG8) - G54-18 (E)

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside vehicle
  3. All doors closed
  4. Back door opener switch assembly off → on

2 V/DIV., 500 ms/DIV.

Pulse generation

(See waveform 1)

M7-12 (CG8B) - G54-18 (E)

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside vehicle
  3. All doors closed
  4. Back door opener switch assembly off → on

2 V/DIV., 500 ms/DIV.

Pulse generation

(See waveform 1)
  • *: For details about the entry function detection area, refer to Operation Check.

    Click here 2019 - 2023 MY RAV4 [11/2018 - 10/2023]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, Gasoline Model): OPERATION CHECK 2024 MY RAV4 [10/2023 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, Gasoline Model): OPERATION CHECK

OK

REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT) 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]; THEFT DETERRENT / KEYLESS ENTRY: ELECTRICAL KEY OSCILLATOR (for Outside Luggage Compartment): REMOVAL 2019 MY RAV4 RAV4 HV [02/2019 - 10/2019]; THEFT DETERRENT / KEYLESS ENTRY: ELECTRICAL KEY OSCILLATOR (for Outside Luggage Compartment): REMOVAL 2020 MY RAV4 RAV4 HV [10/2019 - 08/2020]; THEFT DETERRENT / KEYLESS ENTRY: ELECTRICAL KEY OSCILLATOR (for Outside Luggage Compartment): REMOVAL 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; THEFT DETERRENT / KEYLESS ENTRY: ELECTRICAL KEY OSCILLATOR (for Outside Luggage Compartment): REMOVAL 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; THEFT DETERRENT / KEYLESS ENTRY: ELECTRICAL KEY OSCILLATOR (for Outside Luggage Compartment): REMOVAL 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; THEFT DETERRENT / KEYLESS ENTRY: ELECTRICAL KEY OSCILLATOR (for Outside Luggage Compartment): REMOVAL 2024 MY RAV4 RAV4 HV [10/2023 -        ]; THEFT DETERRENT / KEYLESS ENTRY: ELECTRICAL KEY OSCILLATOR (for Outside Luggage Compartment): REMOVAL

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2019 MY RAV4 RAV4 HV [02/2019 - 10/2019]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2020 MY RAV4 RAV4 HV [10/2019 - 08/2020]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL 2024 MY RAV4 RAV4 HV [10/2023 -        ]; THEFT DETERRENT / KEYLESS ENTRY: CERTIFICATION ECU: REMOVAL