DTC B27A4: Open in Rear Door Electrical Antenna Circuit, Front Passengers Side (07/2015 -): Description

The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the rear door outside handle assembly RH (for rear door RH) (electrical key antenna) at intervals of 0.25 seconds. For the rear door outside handle assembly RH (for rear door RH) (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 RH at intervals of 0.25 seconds. DTC B27A4 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 RH (for rear door RH) (electrical key antenna) (between terminals CLG4 and ANT1, or terminals CG4B and ANT2).

DTC Code	DTC Detection Condition	Trouble Area	DTC Output Confirmation Operation
B27A4	An open circuit is detected in the circuit between the certification ECU (smart key ECU assembly) and rear door outside handle assembly RH (for rear door RH) (CLG4 - ANT1, CG4B - 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 RH (for rear door RH) 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 RH	-

RELATED DATA LIST AND ACTIVE TEST

DTC Code	Data List and Active Test
B27A4	Key diagnostic mode can be used to perform troubleshooting