DTC B27A7-13: Rear Floor 2 Electrical Key Oscillator Circuit Open [11/2023 - ]: 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 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 B27A7-13 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. 3 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
B27A7-13	Rear Floor 2 Electrical Key Oscillator Circuit Open	An open 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*).	Certification ECU (smart key ECU assembly) No. 3 indoor electrical key antenna assembly (inside luggage compartment) Harness or connector	DTC Output Confirmation Operation: 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 rear floor: Power source mode does not charge when engine switch pressed Electrical key transmitter sub-assembly locked inside vehicle	-

RELATED DATA LIST AND ACTIVE TEST

DTC No.	Data List and Active Test
B27A7-13	Key diagnostic mode can be used to perform troubleshooting