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 (inside luggage compartment). For the No. 1 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 B27A7 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
(inside luggage compartment) (between terminals CLG7 and ANTE7, or
terminals CG7B and CLGB). |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
Note | | B27A7 |
Open in Inside Luggage Compartment Electrical Key Oscillator Circuit |
An
open is detected in the circuit between the certification ECU (smart
key ECU assembly) and No. 1 indoor electrical key antenna assembly
(inside luggage compartment) (CLG7 - ANTE7, CG7B - CLGB) (1 trip
detection logic*). |
- Certification ECU (smart key ECU assembly)
- No. 1 indoor electrical key antenna assembly (inside luggage compartment)
- 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 | |
When electrical key transmitter sub-assembly is in luggage compartment:
- Electrical key transmitter sub-assembly locked inside vehicle
| - | Related Data List and Active Test |
DTC No. | Data List and Active Test | |
B27A7 | 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 No. 1 indoor electrical key antenna
assembly (inside luggage compartment). OK: Connectors are properly connected.
| NG |
 | CONNECT CONNECTORS PROPERLY |
|
OK |
 | |
| 2. |
CHECK
HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO.
1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT)) |
(a) Disconnect the K10 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the K13 No. 1 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 | Condition |
Specified Condition | |
K10-11 (CLG7) - K13-1 (ANTE7) |
Always | Below 1 Ω | |
K10-10 (CG7B) - K13-3 (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 NO. 1 INDOOR
ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT)) |
|
*a | Component with harness connected
(Certification ECU (Smart Key ECU Assembly)) |
*b | Waveform 1 | |
*c | Driver door lock sensor not touched |
*d | Driver door lock sensor touched |
(a) Using an oscilloscope, check the waveform. OK: |
Tester Connection | Condition |
Tool Setting | Specified Condition | |
K10-11 (CLG7) - G40-18 (E) | Procedure:
- Door is closed
- Engine 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) | |
K10-10 (CG7B) - G40-18 (E) | Procedure:
- Door is closed
- Engine 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) |
| OK |
| REPLACE NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT) |
| NG |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) | |
