DTC B27A1: Open in Driver Side Electrical Antenna Circuit [09/2014 - ]: Description

The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the front door outside handle assembly LH (for driver door) [electrical key antenna] at intervals of 0.25 seconds. For the front door outside handle assembly LH (for driver door) [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 circuit is detected between the certification ECU (smart key ECU assembly) and front door outside handle assembly LH (for driver door) [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 (smart key ECU assembly) and front door outside handle assembly LH (for driver door) (CLG1 - ANT1, CG1B - ANT2) (This is detected by the malfunction detection circuit in the certification ECU [smart key ECU assembly]) (1 trip detection logic*).	Harness or connector Front door outside handle assembly LH (for driver door) 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
Entry lock/unlock operation cannot be performed for driver door	-

RELATED DATA LIST AND ACTIVE TEST

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