DTC B27A7: Open in Inside Luggage Compartment Electrical Key Oscillator Circuit [08/2015 - 08/2019]: Description

The certification ECU generates a request signal and transmits the signal to the indoor No. 3 electrical key antenna assembly (inside luggage). For the indoor No. 3 electrical key antenna assembly (inside luggage) to detect when the key is inside the luggage compartment, the signal from the certification ECU requesting a response from the key is transmitted inside the luggage compartment. DTC B27A7 is stored by the certification ECU when an open circuit is detected between the certification ECU and indoor No. 3 electrical key antenna assembly (inside luggage) (between terminals CLG7 and CLG6, or terminals CG7B and CLGB).

DTC Code	DTC Detection Condition	Trouble Area	DTC Output Confirmation Operation
B27A7	An open circuit is detected in the circuit between the certification ECU and indoor No. 3 electrical key antenna assembly (inside luggage) (CLG7 - CLG6, CG7B - CLGB) (1 trip detection logic*).	Harness or connector Indoor No. 3 electrical key antenna assembly (inside luggage) Certification ECU	Any time

*: 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 key is in luggage compartment: Power source mode does not change when engine switch is pressed Key becomes locked inside vehicle	-

RELATED DATA LIST AND ACTIVE TEST

DTC Code	Data List and Active Test
B27A7	Key diagnostic mode can be used to perform troubleshooting