DTC B27A1: Open in Driver Side Electrical Antenna Circuit [08/2015 - 08/2019]: Description

The certification ECU generates a request signal and transmits the signal to the front door outside handle assembly LH (driver side electrical key antenna) at intervals of 250 ms. For the front door outside handle assembly LH (driver side electrical key antenna) to detect when the key is brought close to the vehicle, a signal requesting a response from the key is transmitted within approximately 1.0 m (3.28 ft.) of the driver side door at intervals of 250 ms. DTC B27A1 is stored by the certification ECU when an open circuit is detected between the certification ECU and front door outside handle assembly LH (driver side electrical key antenna) (between terminals CLG1 and ANT1, or terminals CG1B and ANT2).

DTC Code	DTC Detection Condition	Trouble Area	DTC Output Confirmation Operation
B27A1	An open circuit is detected in the circuit between the certification ECU and front door outside handle assembly LH (CLG1 - ANT1, CG1B - ANT2) (This is detected by the malfunction detection circuit in the certification ECU) (1 trip detection logic*).	Harness or connector Front door outside handle assembly LH 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
Entry lock/unlock operation cannot be performed for driver side door	-

RELATED DATA LIST AND ACTIVE TEST

DTC Code	Data List and Active Test
B27A1	Key diagnostic mode can be used to perform troubleshooting