Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM1000000026XCM |
Model Year Start: 2023 |
Model: Corolla |
Prod Date Range: [09/2022 -
] |
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): B27A513; Front Floor Electrical Key Oscillator Circuit Open; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ] |
DTC
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B27A513
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Front Floor Electrical Key Oscillator Circuit Open
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DESCRIPTION
The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the No. 1 indoor electrical key antenna assembly (front floor). For the No. 1 indoor electrical key antenna assembly (front floor) 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 B27A513 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. 1 indoor electrical key antenna assembly (front floor) (between terminals CLG5 and ANTE5, or terminals CG5B 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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B27A513
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Front Floor 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. 1 indoor electrical key antenna assembly (front floor) (CLG5 - ANTE5, CG5B - CLGB) (1 trip detection logic*).
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-
Certification ECU (smart key ECU assembly)
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No. 1 indoor electrical key antenna assembly (front floor)
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Wire harness or connector
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DTC Output Confirmation Operation:
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-
*: Only output while a malfunction is present.
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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When electrical key transmitter sub-assembly is in front seat area:
-
Power source mode does not change when power switch pressed
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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
|
B27A513
|
Key diagnostic mode can be used to perform troubleshooting
|
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 No. 1 indoor electrical key antenna assembly (front floor).
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) - NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR))
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(a) Disconnect the I167 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the I34 No. 1 indoor electrical key antenna assembly (front floor) 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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I167-4 (CLG5) - I34-1 (ANTE5)
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Always
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Below 1 Ω
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I167-5 (CG5B) - I34-2 (CLGB)
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Always
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Below 1 Ω
|
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 NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR))
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(a) Connect the I167 certification ECU (smart key ECU assembly) connector.
*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
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*c
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For 30 seconds after any door closed
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*d
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After 30 seconds or more have elapsed since any door closed
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(b) 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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I167-4 (CLG5) - I167-29 (E)
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Procedure:
-
Ignition switch off
-
Electrical key transmitter sub-assembly not inside vehicle
-
Within 30 seconds of closing any door
|
2 V/DIV., 500 ms./DIV.
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Pulse generation
(See waveform)
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I167-5 (CG5B) - I167-29 (E)
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Procedure:
-
Ignition switch off
-
Electrical key transmitter sub-assembly not inside vehicle
-
Within 30 seconds of closing any door
|
2 V/DIV., 500 ms./DIV.
|
Pulse generation
(See waveform)
|
|