Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Outside Luggage Compartment (Back Door) Electrical key Antenna Circuit Open (B27A813)

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System (for Entry Function, Gasoline Model) / Outside Luggage Compartment (Back Door) Electrical key Antenna Circuit Open (B27A813)

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 B27A813 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

B27A813

Outside Luggage Compartment (Back Door) Electrical key Antenna Circuit Open

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 ignition switch is ON.
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

B27A813

Key diagnostic mode can be used to perform troubleshooting

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When using the GTS with the ignition switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
  • The smart key system (for Entry Function) uses the 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

  • Before replacing the certification ECU (smart key ECU assembly), refer to Precaution.

    Click here

  • 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 O200 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the S11 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

O200-4 (CLG8) - S11-2 (ANTE8)

Always

Below 1 Ω

O200-3 (CG8B) - S11-1 (CLGB)

Always

Below 1 Ω

(d) Reconnect the O200 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

*c

Waveform 2

-

-

(a) Using an oscilloscope, check the waveform.

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

O200-4 (CLG8) - I222-29 (E)

Procedure:

  1. Ignition 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)

O200-3 (CG8B) - I222-29 (E)

Procedure:

  1. Ignition 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 2)
OK

REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT)

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    READ NEXT:

     Lost Communication With ECM/PCM "A" Missing Message (U010087,U012987,U014087,U015587,U023087,U111787)

    DESCRIPTION These DTCs are stored when there is a CAN communication malfunction between the certification ECU (smart key ECU assembly and ECM, No. 2 skid control ECU (brake actuator assembly), main bo

     All Door Entry Lock/Unlock Functions and Wireless Functions do not Operate

    DESCRIPTION If the entry lock and wireless door lock operations cannot be performed, the electrical key and tire pressure warning ECU and receiver may be malfunctioning, or there may be wave interfere

     All Door Entry Lock/Unlock Functions do not Operate, but Wireless Functions Operate

    DESCRIPTION When the wireless operation can be used to lock and unlock the doors, communication between the electrical key and tire pressure warning ECU and receiver and certification ECU (smart key E

    SEE MORE:

     Hydraulic Pressure Unit Component Internal Failure (P094296)

    DESCRIPTION Refer to DTC P02CB11. Click here DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate Note P094296 Hydraulic Pressure Unit Component Internal Failure 1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Tim

     Right Electric Parking Brake Actuator Control Circuit Open (C061013)

    DESCRIPTION DTC No. Detection Item DTC Detection Condition Trouble Area Memory Note C061013 Right Electric Parking Brake Actuator Control Circuit Open Diagnosis Condition: Electric

    © 2020-2024 Copyright www.tcorollacross.com