DTC B27A1: Open in Driver Side Electrical Antenna Circuit [10/2018 - 07/2022]: Description

The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the front door outside handle assembly LH (electrical key antenna) at intervals of 0.25 seconds. For the front door outside handle assembly LH (electrical key antenna) to detect when the electrical key transmitter sub-assembly is brought close to the vehicle, a signal requesting a response from the electrical key transmitter sub-assembly is transmitted within approximately 1 m (3.28 ft.) of the driver door at intervals of 0.25 seconds. DTC B27A1 is stored by the certification ECU (smart key ECU assembly) when an open is detected between the certification ECU (smart key ECU assembly) and front door outside handle assembly LH (electrical key antenna) (between terminals CLG1 and ANT1, or terminals CG1B and ANT2).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
B27A1	Open in Driver Side Electrical Antenna Circuit	An open is detected in the circuit between the certification ECU (smart key ECU assembly) and front door outside handle assembly LH (CLG1 - ANT1, CG1B - ANT2) (This is detected by the malfunction detection circuit in the certification ECU (smart key ECU assembly)) (1 trip detection logic*).	Certification ECU (smart key ECU assembly) Front door outside handle assembly LH 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
Entry lock/unlock operation cannot be performed for driver door	-

RELATED DATA LIST AND ACTIVE TEST

DTC No.	Data List and Active Test
B27A1	Key diagnostic mode can be used to perform troubleshooting