DTC B27A7: Open in Inside Luggage Compartment Electrical Key Oscillator Circuit [09/2014 - ]: Description

The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the No. 3 indoor electrical key antenna assembly (inside luggage compartment). For the No. 3 indoor electrical key antenna assembly (inside luggage compartment) to detect when the electrical key transmitter sub-assembly is inside the luggage compartment, the signal from the certification ECU (smart key ECU assembly) requesting a response from the electrical key transmitter sub-assembly is transmitted inside the luggage compartment. DTC B27A7 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 No. 3 indoor electrical key antenna assembly (inside luggage compartment) (between terminals CLG7 and ANTE7, 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 (smart key ECU assembly) and No. 3 indoor electrical key antenna assembly (inside luggage compartment) (CLG7 - ANTE7, CG7B - CLGB) (1 trip detection logic*).	Harness or connector No. 3 indoor electrical key antenna assembly (inside luggage compartment) Certification ECU (smart key ECU assembly)	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 electrical key transmitter sub-assembly is in luggage compartment: Electrical key transmitter sub-assembly 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