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 Luggage
Compartment door. DTC B27A8 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). |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
Note | | B27A8 |
Open in Outside Luggage Compartment Electrical Key Antenna Circuit |
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*). |
- Certification ECU (smart key ECU assembly)
- Electrical key antenna (outside luggage compartment)
- Harness or connector
|
|
- *: Only output while a malfunction is present and the engine switch is on (IG).
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 luggage compartment door |
- | Related Data List and Active Test |
DTC No. | Data List and Active Test | |
B27A8 | 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 electrical key antenna (outside luggage
compartment). OK: Connectors are properly connected.
| NG |
 | CONNECT CONNECTORS PROPERLY |
|
OK |
 | |
| 2. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT)) |
(a) Disconnect the K10 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the P2 electrical key antenna (outside luggage compartment) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
K10-13 (CLG8) - P2-2 (ANTE8) |
Always | Below 1 Ω | |
K10-12 (CG8B) - P2-1 (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 ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT)) |
|
*a | Component with harness connected
(Certification ECU (Smart Key ECU Assembly)) |
*b | Waveform 1 |
(a) Using an oscilloscope, check the waveform. OK: |
Tester Connection | Condition |
Tool Setting | Specified Condition | |
K10-13 (CLG8) - G40-18 (E) | Procedure:
- Engine switch off
- Electrical key transmitter sub-assembly brought outside vehicle
- All doors closed
- Luggage electrical key switch off → on
| 2 V/DIV., 500 ms/DIV. |
Pulse generation (See waveform 1) | |
K10-12 (CG8B) - G40-18 (E) | Procedure:
- Engine switch off
- Electrical key transmitter sub-assembly brought outside vehicle
- All doors closed
- Luggage electrical key switch off → on
| 2 V/DIV., 500 ms/DIV. |
Pulse generation (See waveform 1) |
| OK |
| REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT) |
| NG |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) | |
