DTC B27A7: Open in Inside Luggage Compartment Electrical Key Oscillator Circuit: 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 (rear floor). For the No. 3 indoor electrical key antenna assembly (rear floor) to detect when the electrical key transmitter sub-assembly is inside the vehicle, 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 circuit is detected between the certification ECU (smart key ECU assembly) and No. 3 indoor electrical key antenna assembly (rear floor) (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 (rear floor) (CLG7 - ANTE7, CG7B - CLGB) (1 trip detection logic*).	Wire harness or connector No. 3 indoor electrical key antenna assembly (rear floor) 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 rear seat area: Power source mode does not change when power switch pressed Electrical key transmitter sub-assembly 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