Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001G1ZJ
Model Year Start: 2019 Model: RAV4 Prod Date Range: [11/2018 -           ]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function, Gasoline Model): B27A4; Open in Rear Door Electrical Antenna Circuit, Front Passengers Side; 2019 - 2024 MY RAV4 [11/2018 -        ]

DTC

B27A4

Open in Rear Door Electrical Antenna Circuit, Front Passengers Side

DESCRIPTION

The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the rear door outside handle assembly RH (electrical key antenna) at intervals of 0.25 seconds. For the rear door outside handle assembly RH (electrical key antenna) to detect when the electrical key transmitter sub-assembly is brought close to the vehicle, a signal requesting a response from the electrical key transmitter sub-assembly is transmitted within approximately 1 m (3.28 ft.) of the rear door at intervals of 0.25 seconds. DTC B27A4 is stored by the certification ECU (smart key ECU assembly) when an open circuit is detected between the certification ECU (smart key ECU assembly) and rear door outside handle assembly RH (electrical key antenna) (between terminals CLG4 and ANT1, or terminals CG4B and ANT2).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B27A4

Open in Rear Door Electrical Antenna Circuit, Front Passengers Side

An open circuit is detected in the circuit between the certification ECU (smart key ECU assembly) and rear door outside handle assembly RH (CLG4 - ANT1, CG4B - ANT2) (This is detected by the malfunction detection circuit in the certification ECU (smart key ECU assembly)) (1 trip detection logic*).
  • Certification ECU (smart key ECU assembly)
  • Rear door outside handle assembly RH
  • Harness or connector

DTC Output Confirmation Operation:

  • Any time
  • *: Only output while a malfunction is present.

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 rear door RH

-

Related Data List and Active Test

DTC Code

Data List and Active Test

B27A4

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 rear door outside handle assembly RH.

OK:

Connectors are properly connected.

NG

CONNECT CONNECTORS PROPERLY
OK

2.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - REAR DOOR OUTSIDE HANDLE ASSEMBLY RH)

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

(b) Disconnect the K6 rear door outside handle assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

M7-9 (CLG4) - K6-6 (ANT1)

Always

Below 1 Ω

M7-8 (CG4B) - K6-4 (ANT2)

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 REAR DOOR OUTSIDE HANDLE ASSEMBLY RH)

*a

Component with harness connected

(Certification ECU (Smart Key ECU Assembly))

*b

Waveform 1

*c

Waveform 2

*d

Waveform 3

*e

Waveform 4

-

-

(a) Using an oscilloscope, check the waveform.

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

M7-9 (CLG4) - G54-18 (E)

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought inside detection area*)

5 V/DIV., 500 ms/DIV.

Pulse generation

(See waveform 1)

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought outside detection area*)

5 V/DIV., 100 ms/DIV.

Pulse generation

(See waveform 2)

M7-8 (CG4B) - G54-18 (E)

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought inside detection area*)

5 V/DIV., 500 ms/DIV.

Pulse generation

(See waveform 3)

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought outside detection area*)

5 V/DIV., 100 ms/DIV.

Pulse generation

(See waveform 4)
  • *: 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 REAR DOOR OUTSIDE HANDLE ASSEMBLY RH 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]; DOOR / HATCH: REAR DOOR: DISASSEMBLY 2019 MY RAV4 RAV4 HV [02/2019 - 10/2019]; DOOR / HATCH: REAR DOOR: DISASSEMBLY 2020 MY RAV4 RAV4 HV [10/2019 - 08/2020]; DOOR / HATCH: REAR DOOR: DISASSEMBLY 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; DOOR / HATCH: REAR DOOR: DISASSEMBLY 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; DOOR / HATCH: REAR DOOR: DISASSEMBLY 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; DOOR / HATCH: REAR DOOR: DISASSEMBLY 2024 MY RAV4 RAV4 HV [10/2023 -        ]; DOOR / HATCH: REAR DOOR: DISASSEMBLY

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