- Power source mode does not charge when engine switch pressed
- Electrical key transmitter sub-assembly locked inside vehicle
| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM1000000028KA8 |
| Model Year Start: 2023 | Model: GR Corolla | Prod Date Range: [11/2022 - ] |
| Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): B27A713; Rear Floor 2 Electrical Key Oscillator Circuit Open; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [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. 2 indoor electrical key antenna assembly (inside luggage compartment)*1 or No. 3 indoor electrical key antenna assembly (inside luggage compartment)*2. For the No. 2 indoor electrical key antenna assembly (inside luggage compartment)*1 or No. 3 indoor electrical key antenna assembly (inside luggage compartment)*2 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. 2 indoor electrical key antenna assembly (inside luggage compartment)*1 or No. 3 indoor electrical key antenna assembly (inside luggage compartment)*2 (between terminals CLG7 and ANTE7, or terminals CG7B and CLGB).
- *1: for G16E-GTS
- *2: except G16E-GTS
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Note |
|---|---|---|---|---|
|
B27A713 |
Rear Floor 2 Electrical Key Oscillator Circuit Open |
An open is detected in the circuit between the certification ECU (smart key ECU assembly) and No. 2 indoor electrical key antenna assembly (inside luggage compartment)*1 or No. 3 indoor electrical key antenna assembly (inside luggage compartment)*2 (CLG7 - ANTE7, CG7B - CLGB) (1 trip detection logic*3). |
|
DTC Output Confirmation Operation:
|
- *1: for G16E-GTS
- *2: except G16E-GTS
- *3: 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 |
|---|---|
|
When electrical key transmitter sub-assembly is in rear floor: |
- |
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
NOTICE:
-
The smart key system (for Start 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 Start Function) after confirming that the communication systems are functioning properly.
Click here
![2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 - ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING](/t3Portal/stylegraphics/info.gif)
-
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 Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Smart Key (CAN). 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.
-
Before replacing the certification ECU (smart key ECU assembly), refer to Registration.
Click here
- After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
PROCEDURE
|
1. |
SYSTEM CHECK |
(a) Check the vehicle specification.
|
Result |
Proceed to |
|---|---|
|
except Sedan (for G16E-GTS) |
A |
|
except Sedan (except G16E-GTS) |
B |
|
for Sedan |
C |
| B |
|
| C |
|
|
|
2. |
CHECK CONNECTOR CONNECTION |
(a) Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and No. 2 indoor electrical key antenna assembly (inside luggage compartment).
OK:
Connectors are properly connected.
| NG |
|
CONNECT CONNECTORS PROPERLY |
|
|
3. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT)) |
Pre-procedure1
(a) Disconnect the O174 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the O40 No. 2 indoor electrical key antenna assembly (inside luggage compartment) connector.
Procedure1
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
O174-10 (CLG7) - O40-1 (ANTE7) |
Always |
Below 1 Ω |
|
O174-9 (CG7B) - O40-2 (CLGB) |
Always |
Below 1 Ω |
Post-procedure1
(d) None
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT)) |
Pre-procedure1
(a) Connect the O174 certification ECU (smart key ECU assembly) connector.
Procedure1
(b) Using an oscilloscope, check the waveform.
|
*a |
Component with harness connected (Certification ECU (Smart Key ECU Assembly)) |
*b |
Waveform |
|
*c |
For 30 seconds after any door closed |
*d |
After 30 seconds or more have elapsed since any door closed |
OK:
|
Tester Connection |
Condition |
Tool Setting |
Specified Condition |
|---|---|---|---|
|
O174-10 (CLG7) - I167-29 (E) |
Procedure:
|
2 V/DIV., 500 ms./DIV. |
Pulse generation (See waveform) |
|
O174-9 (CG7B) - I167-29 (E) |
Procedure:
|
2 V/DIV., 500 ms./DIV. |
Pulse generation (See waveform) |
Post-procedure1
(c) None
| OK |
|
REPLACE NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT) |
| NG |
|
|
5. |
CHECK CONNECTOR CONNECTION |
(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 |
|
|
6. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT)) |
Pre-procedure1
(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.
Procedure1
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
O174-10 (CLG7) - O40-1 (ANTE7) |
Always |
Below 1 Ω |
|
O174-9 (CG7B) - O40-2 (CLGB) |
Always |
Below 1 Ω |
Post-procedure1
(d) None
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
7. |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT)) |
Pre-procedure1
(a) Connect the O174 certification ECU (smart key ECU assembly) connector.
Procedure1
(b) Using an oscilloscope, check the waveform.
|
*a |
Component with harness connected (Certification ECU (Smart Key ECU Assembly)) |
*b |
Waveform |
|
*c |
For 30 seconds after any door closed |
*d |
After 30 seconds or more have elapsed since any door closed |
OK:
|
Tester Connection |
Condition |
Tool Setting |
Specified Condition |
|---|---|---|---|
|
O174-10 (CLG7) - I167-29 (E) |
Procedure:
|
2 V/DIV., 500 ms./DIV. |
Pulse generation (See waveform) |
|
O174-9 (CG7B) - I167-29 (E) |
Procedure:
|
2 V/DIV., 500 ms./DIV. |
Pulse generation (See waveform) |
Post-procedure1
(c) None
| OK |
|
REPLACE NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT) |
| NG |
|
|
|