DTC Code | DTC Name |
---|---|
B27A8 | Open in Outside Luggage Compartment Electrical Key Antenna Circuit |
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 back door. DTC B27A8 is stored by the certification ECU (smart key ECU assembly) when an open circuit is detected between the certification ECU (smart key ECU assembly) and electrical key antenna (outside luggage compartment) (between terminals CLG8 and CLG, 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 circuit is detected in the circuit between the certification ECU (smart key ECU assembly) and electrical key antenna (outside luggage compartment) (CLG8 - CLG, CG8B - CLGB) (1 trip detection logic*). |
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DTC Output Confirmation Operation: |
*: Only output while a malfunction is present and the engine switch is on (IG).
Vehicle Condition when Malfunction Detected | Fail-safe Operation when Malfunction Detected |
---|---|
Entry lock/unlock operation cannot be performed for back door | - |
DTC Code | Data List and Active Test |
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B27A8 | Key diagnostic mode can be used to perform troubleshooting |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
Note
The smart entry and start system (for Entry Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart entry and start system (for Entry Function) after confirming that the communication systems are functioning properly.
When using the GTS with the engine 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 / Entry&Start(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 smart entry and start system (for Entry Function) Precaution.
After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
PROCEDURE
CHECK CONNECTOR CONNECTION
Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and electrical key antenna (outside luggage compartment).
OK |
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Connectors are properly connected. |
Result | |||
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|
NG |
CONNECT CONNECTORS PROPERLY |
OK |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT))
Disconnect the G21 and G22 certification ECU (smart key ECU assembly) connectors.
Disconnect the K1 electrical key antenna (outside luggage compartment) connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||
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Reconnect the G21 and G22 certification ECU (smart key ECU assembly) connectors.
Result | |||
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|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
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 |
Using an oscilloscope, check the waveform.
OK | ||||||||||||
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Result | |||
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|
NG |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
OK |
REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT)
Temporarily replace the electrical key antenna (outside luggage compartment) with a new one.
Result | ||
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|
NEXT |
CLEAR DTC
Clear the DTCs.
Result | ||
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|
NEXT |
CHECK FOR DTC
Check for DTCs.
OK |
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DTC B27A8 is not output. |
Result | |||
---|---|---|---|
|
OK |
END (ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT) WAS DEFECTIVE) |
NG |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |