DTC B27A3: Open in Rear Door Electrical Antenna Circuit, Drivers Side [09/2014 - ]: Description

The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the rear door outside handle assembly LH (for rear door LH) (electrical key antenna) at intervals of 0.25 seconds. For the rear door outside handle assembly LH (for rear door 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 rear door LH at intervals of 0.25 seconds. DTC B27A3 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 rear door outside handle assembly LH (for rear door LH) (electrical key antenna) (between terminals CLG3 and ANT1, or terminals CG3B and ANT2).

DTC Code	DTC Detection Condition	Trouble Area	DTC Output Confirmation Operation
B27A3	An open circuit is detected in the circuit between the certification ECU (smart key ECU assembly) and rear door outside handle assembly LH (for rear door LH) (CLG3 - ANT1, CG3B - ANT2) (This is detected by the malfunction detection circuit in the certification ECU [smart key ECU assembly]) (1 trip detection logic*).	Harness or connector Rear door outside handle assembly LH (for rear door LH) 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 rear door LH	-

RELATED DATA LIST AND ACTIVE TEST

DTC Code	Data List and Active Test
B27A3	Key diagnostic mode can be used to perform troubleshooting