DESCRIPTION The
certification ECU (smart key ECU assembly) generates a request signal
and transmits the signal to the front door outside handle assembly (for
driver door) (electrical key antenna) at intervals of 0.25 seconds. For
the front door outside handle assembly (for driver door) (electrical key
antenna) to detect when the electrical key transmitter sub-assembly is
brought close to the vehicle, a signal requesting a response from the
electrical key transmitter sub-assembly is transmitted within
approximately 1 m (3.28 ft.) of the driver door at intervals of 0.25
seconds. DTC B27A1 is stored by the certification ECU (smart key ECU
assembly) when an open is detected between the certification ECU (smart
key ECU assembly) and front door outside handle assembly (for driver
door) (electrical key antenna) (between terminals CLG1 and ANTE1, or
terminals CG1B and CLGB). |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
Note | | B27A1 |
Open in Driver Side Electrical Antenna Circuit |
An
open is detected in the circuit between the certification ECU (smart
key ECU assembly) and front door outside handle assembly (for driver
door) (CLG1 - ANTE1, CG1B - CLGB) (This is detected by the malfunction
detection circuit in the certification ECU (smart key ECU assembly)) (1
trip detection logic*). |
- Certification ECU (smart key ECU assembly)
- Front door outside handle assembly (for driver door)
- Harness or connector
|
|
- *: 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 | |
Entry lock/unlock operation cannot be performed for driver door |
- | Related Data List and Active Test |
DTC No. | Data List and Active Test | |
B27A1 | Key diagnostic mode can be used to perform troubleshooting | WIRING DIAGRAM
 CAUTION / NOTICE / HINT
NOTICE:
- The smart key system (for Entry Function, Gasoline Model) uses the CAN
communication system. Inspect the communication function by following
How to Proceed with Troubleshooting. Troubleshoot the smart key system
(for Entry Function, Gasoline Model) after confirming that the
communication systems are functioning properly.
Click here 
- When using the Techstream with the engine switch off, connect the
Techstream to the DLC3 and turn a courtesy light switch on and off at
intervals of 1.5 seconds or less until communication between the
Techstream and the vehicle begins. Then select the vehicle type under
manual mode and enter the following menus: Body Electrical / Smart Key.
While using the Techstream, periodically turn a courtesy light switch on
and off at intervals of 1.5 seconds or less to maintain communication
between the Techstream and the vehicle.
- 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 front door outside handle assembly (for
driver door). OK: Connectors are properly connected.
| NG |
 | CONNECT CONNECTORS PROPERLY |
|
OK |
 | |
| 2. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER DOOR)) |
(a) Disconnect the K10 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the I23 front door outside handle assembly (for driver door) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
K10-17 (CLG1) - I23-6 (ANTE1) |
Always | Below 1 Ω | |
K10-16 (CG1B) - I23-4 (CLGB) |
Always | Below 1 Ω |
(d) Reconnect the K10 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 FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER DOOR)) |
|
*a | Component with harness connected
(Certification ECU (Smart Key ECU Assembly)) |
*b | Waveform 1 | |
*c | Waveform 2 |
*d | Waveform 3 | |
*e | Waveform 4 | - |
- | (a) Using an oscilloscope, check the waveform.
OK: |
Tester Connection | Condition |
Tool Setting | Specified Condition | |
K10-17 (CLG1) - G40-18 (E) | Procedure:
- Engine switch off
- All doors closed
- Electrical key transmitter sub-assembly not inside vehicle
- All doors locked through wireless operation
(electrical key transmitter sub-assembly brought inside detection area*)
| 5 V/DIV., 500 ms/DIV. |
Pulse generation (See waveform 1) | |
Procedure:
- Engine switch off
- All doors closed
- Electrical key transmitter sub-assembly not inside vehicle
- All doors locked through wireless operation
(electrical key transmitter sub-assembly brought outside detection area*)
| 5 V/DIV., 100 ms/DIV. |
Pulse generation (See waveform 2) | |
K10-16 (CG1B) - G40-18 (E) | Procedure:
- Engine switch off
- All doors closed
- Electrical key transmitter sub-assembly not inside vehicle
- All doors locked through wireless operation
(electrical key transmitter sub-assembly brought inside detection area*)
| 5 V/DIV., 500 ms/DIV. |
Pulse generation (See waveform 3) | |
Procedure:
- Engine switch off
- All doors closed
- Electrical key transmitter sub-assembly not inside vehicle
- All doors locked through wireless operation
(electrical key transmitter sub-assembly brought outside detection area*)
| 5 V/DIV., 100 ms/DIV. |
Pulse generation (See waveform 4) |
- *: For details about the entry function detection area, refer to Operation Check.
Click here
| OK |
| REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER DOOR) |
| NG |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) | |
