Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM1000000026A3A |
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)): B27A713; Rear Floor 2 Electrical Key Oscillator Circuit Open; 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022] |
DTC
|
B27A713
|
Rear Floor 2 Electrical Key Oscillator Circuit Open
|
DESCRIPTION
The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the No. 3 indoor electrical key antenna assembly (inside luggage compartment). For the No. 3 indoor electrical key antenna assembly (inside luggage compartment) to detect when the electrical key transmitter sub-assembly is in the cabin, the signal from the certification ECU (smart key ECU assembly) requesting a response from the electrical key transmitter sub-assembly is transmitted inside the vehicle. DTC B27A713 is stored by the certification ECU (smart key ECU assembly) when an open is detected between the certification ECU (smart key ECU assembly) and No. 3 indoor electrical key antenna assembly (inside luggage compartment) (between terminals CLG7 and ANTE7, or terminals CG7B and CLGB).
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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B27A713
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Rear Floor 2 Electrical Key Oscillator Circuit Open
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An open is detected in the circuit between the certification ECU (smart key ECU assembly) and No. 3 indoor electrical key antenna assembly (inside luggage compartment) (CLG7 - ANTE7, CG7B - CLGB) (1 trip detection logic*).
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-
Certification ECU (smart key ECU assembly)
-
No. 3 indoor electrical key antenna assembly (inside luggage compartment)
-
Harness or connector
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DTC Output Confirmation Operation:
|
-
*: 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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Electrical key transmitter sub-assembly locked inside vehicle
|
-
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Related Data List and Active Test
DTC No.
|
Data List and Active Test
|
B27A713
|
Key diagnostic mode can be used to perform troubleshooting
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
PROCEDURE
(a) Check the vehicle specification.
Result
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Proceed to
|
for Sedan
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A
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except Sedan
|
B
|
A
|
|
|
2.
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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 No. 3 indoor electrical key antenna assembly (inside luggage compartment).
OK:
Connectors are properly connected.
NG |
|
CONNECT CONNECTORS PROPERLY
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OK
|
|
|
3.
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CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT))
|
(a) Disconnect the O174 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the O40 No. 3 indoor electrical key antenna assembly (inside 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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O174-10 (CLG7) - O40-1 (ANTE7)
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Always
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Below 1 Ω
|
O174-9 (CG7B) - O40-2 (CLGB)
|
Always
|
Below 1 Ω
|
(d) Reconnect the O174 certification ECU (smart key ECU assembly) connector.
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
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OK
|
|
|
4.
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CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT))
|
*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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(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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O174-10 (CLG7) - I167-29 (E)
|
Procedure:
-
Door is closed
-
Ignition switch off
-
Electrical key transmitter sub-assembly not inside vehicle
-
Driver door lock sensor touched
|
2 V/DIV., 500 ms./DIV.
|
Pulse generation
(See waveform 1)
|
O174-9 (CG7B) - I167-29 (E)
|
Procedure:
-
Door is closed
-
Ignition switch off
-
Electrical key transmitter sub-assembly not inside vehicle
-
Driver door lock sensor touched
|
2 V/DIV., 500 ms./DIV.
|
Pulse generation
(See waveform 1)
|
|