Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM1000000026A2K |
Model Year Start: 2023 |
Model: GR Corolla |
Prod Date Range: [09/2022 - 11/2022] |
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Entry Function (except TMMMS Made)): B27A813; Outside Luggage Compartment (Back Door) Electrical key Antenna Circuit Open; 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022] |
DTC
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B27A813
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Outside Luggage Compartment (Back Door) Electrical key Antenna Circuit Open
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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*1 or luggage compartment door*2. 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).
-
*1: except Sedan
-
*2: for Sedan
DTC No.
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Detection Item
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DTC Detection Condition
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Trouble Area
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Note
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B27A813
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Outside Luggage Compartment (Back Door) Electrical key Antenna Circuit Open
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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*).
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-
Certification ECU (smart key ECU assembly)
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Electrical key antenna (outside luggage compartment)
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Harness or connector
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DTC Output Confirmation Operation:
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-
*: 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
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Fail-safe Operation when Malfunction Detected
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except Sedan:
-
Entry lock/unlock operation cannot be performed for back door
for Sedan:
-
Entry lock/unlock operation cannot be performed for luggage compartment door
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-
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Related Data List and Active Test
DTC No.
|
Data List and Active Test
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B27A813
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Key diagnostic mode can be used to perform troubleshooting
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
PROCEDURE
1.
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CHECK CONNECTOR CONNECTION
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(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 |
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CONNECT CONNECTORS PROPERLY
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OK
|
|
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2.
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CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT))
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(a) Disconnect the O174 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the O39 electrical key antenna (outside luggage compartment) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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O174-4 (CLG8) - O39-2 (ANTE8)
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Always
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Below 1 Ω
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O174-3 (CG8B) - O39-1 (CLGB)
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Always
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Below 1 Ω
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(d) Reconnect the O174 certification ECU (smart key ECU assembly) connector.
NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR
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OK
|
|
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3.
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CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT))
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*a
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Component with harness connected
(Certification ECU (Smart Key ECU Assembly))
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*b
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Waveform 1
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*c
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Waveform 2
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-
|
-
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(a) Using an oscilloscope, check the waveform.
OK:
Tester Connection
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Condition
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Tool Setting
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Specified Condition
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O174-4 (CLG8) - I167-29 (E)
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Procedure:
except Sedan:
-
Ignition switch off
-
Electrical key transmitter sub-assembly brought outside vehicle
-
All doors closed
-
Back door opener switch sub-assembly off → on
for Sedan:
-
Ignition switch off
-
Electrical key transmitter sub-assembly brought outside vehicle
-
All doors closed
-
Luggage electrical key switch off → on
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5 V/DIV., 50 ms./DIV.
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Pulse generation
(See waveform 1)
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O174-3 (CG8B) - I167-29 (E)
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Procedure:
except Sedan:
-
Ignition switch off
-
Electrical key transmitter sub-assembly brought outside vehicle
-
All doors closed
-
Back door opener switch sub-assembly off → on
for Sedan:
-
Ignition switch off
-
Electrical key transmitter sub-assembly brought outside vehicle
-
All doors closed
-
Luggage electrical key switch assembly off → on
|
5 V/DIV., 50 ms./DIV.
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Pulse generation
(See waveform 2)
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|