ENTRY AND START SYSTEM(for Entry Function), Diagnostic DTC:B27A2

DTC Code	DTC Name
B27A2	Open in Front Passenger Side Electrical Antenna Circuit

DESCRIPTION

The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the front door outside handle assembly (front passenger side electrical key antenna) at intervals of 250 ms. For the certification ECU (smart key ECU assembly) to detect when the key is brought close to the vehicle, a signal requesting a response from the key is transmitted within approximately 1 m (3.28 ft.) of the front passenger side door at intervals of 250 ms. DTC B27A2 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 (front passenger side electrical key antenna) (between terminals CLG2 and ANT1, or terminals CG2B and ANT2).

DTC No.	DTC Detection Condition	Trouble Area	DTC Output Confirmation Operation
B27A2	An open circuit is detected in the circuit between the certification ECU (smart key ECU assembly) and front door outside handle assembly (CLG2 - ANT1, CG2B - ANT2) (1 trip detection logic*1).	Harness or connector Front door outside handle assembly (for front passenger side door) Certification ECU (smart key ECU assembly)	Any time*2

*1: Only output while a malfunction is present.
*2: Only when the vehicle is stopped.

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 front passenger side door	-

Related Data List and Active Test
DTC No.	Data List and Active Test
B27A2	Key diagnostic mode can be used to perform troubleshooting

WIRING DIAGRAM

CAUTION / NOTICE / HINT

Note

When using the GTS with the vehicle power switch off, connect the GTS to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry & Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
The entry and start system (for Entry Function) uses a LIN communication system and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting Click here. Troubleshoot the entry and start system (for Entry Function) after confirming that the communication systems are functioning properly.
Before replacing the certification ECU (smart key ECU assembly), refer to the entry and start system (for Entry Function) precaution Click here.
After repair, confirm DTC does not reoccur by performing the "DTC Output Confirmation Operation".
Front door outside handle assembly (for front passenger side door) has an antenna coil between ANT1 and ANT2 terminals.

PROCEDURE

CHECK CONNECTOR CONNECTION CONDITION
1. Turn the power switch off.
2. Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and the front door outside handle assembly.
  
  OK
  
  Connectors are properly connected.
NG
CONNECT CONNECTORS PROPERLY

OK

OK
Connectors are properly connected.

CHECK HARNESS AND CONNECTOR (FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR FRONT PASSENGER SIDE DOOR) - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

Disconnect the F48 certification ECU (smart key ECU assembly) connector.
Disconnect the G9*1 or H9*2 front door outside handle assembly (for front passenger side door) connector.
- *1: for LHD
- *2: for RHD

Measure the resistance according to the value(s) in the table below.

Standard Resistance

for LHD
Tester Connection	Condition	Specified Condition
F48-13 (CLG2) - G9-6 (ANT1)	Always	Below 1 Ω
F48-12 (CG2B) - G9-3 (ANT2)	Always	Below 1 Ω
F48-1 (E) - Body ground	Always	Below 1 Ω
F48-13 (CLG2) - Body ground	Always	10 kΩ or higher
F48-12 (CG2B) - Body ground	Always	10 kΩ or higher

for RHD
Tester Connection	Condition	Specified Condition
F48-13 (CLG2) - H9-6 (ANT1)	Always	Below 1 Ω
F48-12 (CG2B) - H9-3 (ANT2)	Always	Below 1 Ω
F48-1 (E) - Body ground	Always	Below 1 Ω
F48-13 (CLG2) - Body ground	Always	10 kΩ or higher
F48-12 (CG2B) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO FRONT PASSENGER SIDE ELECTRICAL KEY ANTENNA)

Text in Illustration
*a	Component with harness connected (Certification ECU (smart key ECU assembly))	*b	Waveform 1
*c	Waveform 2	-	-

Reconnect the F48 certification ECU (smart key ECU assembly) connector.
Reconnect the G9*1 or H9*2 front door outside handle assembly (for front passenger side door) connector.
- *1: for LHD
- *2: for RHD

Using an oscilloscope, check the waveform.

Tech Tips

Check that the entry cancel function, which is one of the customizing settings of the entry and start system, is not set Click here.

Tester Connection

Switch Condition

Tool Setting

Specified Condition

F48-13 (CLG2) - F48-1 (E)

Procedure:

Power switch off
Electrical key transmitter sub-assembly brought outside vehicle
All doors closed
Electrical key transmitter not inside vehicle
Electrical key transmitter brought outside detection area*1
All doors locked through wireless operation

5 V/DIV., 500 ms/DIV.

Pulse generation

(See waveform 1)

F48-12 (CG2B) - F48-1 (E)

Procedure:

Power switch off
Electrical key transmitter brought outside vehicle
All doors closed
Electrical key transmitter sub-assembly not inside vehicle
Electrical key transmitter sub-assembly brought outside detection area*1
All doors locked through wireless operation

2 V/DIV., 500 ms/DIV.

Pulse generation

(See waveform 2)

*1: For details about the areas that are outside the entry function detection area, refer to Operation Check Click here.

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR FRONT PASSENGER SIDE DOOR)
1. Temporarily replace the front door outside handle assembly (for front passenger side door) with a new or normally functioning one Click here.
NEXT
CHECK DTC OUTPUT
1. Clear the DTCs Click here.
2. Recheck for DTCs Click here.
  
  OK
  
  DTC B27A2 is not output.
OK
END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR FRONT PASSENGER SIDE DOOR) WAS DEFECTIVE)

NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)