THEFT DETERRENT / KEYLESS ENTRY  SMART ENTRY AND START SYSTEM(for Entry Function)  B27A1  Open in Driver 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 (for driver door) (electrical key antenna) at intervals of 0.25 seconds. For the front door outside handle assembly (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 (for driver door) (electrical key antenna) (between terminals CLG1 and ANT1, or terminals CG1B and ANT2).

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B27A1 Open in Driver Side Electrical Antenna Circuit An open circuit is detected in the circuit between the certification ECU (smart key ECU assembly) and front door outside handle assembly (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*).
·

Wire harness or connector

·

Front door outside handle assembly (for driver door)

·

Certification ECU (smart key ECU assembly)


DTC Output Confirmation Operation

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

WIRING DIAGRAM

B349521E84
0.396,3.667 2.052,4.083 1.656,0.417 10 false Front Door Outside Handle Assembly (for Driver Door) 0.396,3.49 1.281,3.719 0.885,0.229 10 false G14 5.417,3.521 6.969,4.031 1.552,0.51 10 false Certification ECU (Smart Key ECU Assembly) 1.313,0.729 1.854,0.938 0.542,0.208 10 false ANT1 1.302,1.198 1.844,1.406 0.542,0.208 10 false ANT2 1.552,1.667 2.094,1.875 0.542,0.208 10 false B 1.271,2.125 1.813,2.333 0.542,0.208 10 false SENS 1.302,2.583 1.844,2.792 0.542,0.208 10 false TRG+ 1.375,3.031 1.917,3.24 0.542,0.208 10 false GND 1.781,0.604 2.323,0.813 0.542,0.208 10 false 6 1.792,1.063 2.333,1.271 0.542,0.208 10 false 3 1.792,1.521 2.333,1.729 0.542,0.208 10 false 5 1.792,1.99 2.333,2.198 0.542,0.208 10 false 4 1.781,2.438 2.323,2.646 0.542,0.208 10 false 1 1.792,2.906 2.333,3.115 0.542,0.208 10 false 2 5.427,0.542 5.969,0.75 0.542,0.208 10 false 12 5.354,0.719 5.833,0.938 0.479,0.219 10 false E110 5.344,3.021 5.771,3.271 0.427,0.25 10 false E108 5.438,1 5.979,1.208 0.542,0.208 10 false 13 5.427,1.458 5.969,1.667 0.542,0.208 10 false 19 5.427,1.917 5.969,2.125 0.542,0.208 10 false 22 5.427,2.375 5.969,2.583 0.542,0.208 10 false 20 5.438,2.833 5.979,3.042 0.542,0.208 10 false 11 5.74,0.74 6.281,0.948 0.542,0.208 10 false CLG1 5.74,1.188 6.281,1.396 0.542,0.208 10 false CG1B 5.74,1.656 6.281,1.865 0.542,0.208 10 false POS1 5.74,2.115 6.281,2.323 0.542,0.208 10 false SEN1 5.74,2.583 6.281,2.792 0.542,0.208 10 false TSW1 5.75,3.031 6.292,3.24 0.542,0.208 10 false E 5.344,1.188 5.781,1.396 0.438,0.208 10 false E110 5.344,1.635 5.781,1.844 0.438,0.208 10 false E110 5.354,2.104 5.792,2.313 0.438,0.208 10 false E110 5.344,2.552 5.781,2.76 0.438,0.208 10 false E110

CAUTION / NOTICE / HINT

NOTICE:
·

The smart entry and start system (for Entry Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart entry and start system (for Entry Function) after confirming that the communication systems are functioning properly.

Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>SMART ENTRY AND START SYSTEM(for Entry Function)>HOW TO PROCEED WITH TROUBLESHOOTING

·

When using the GTS with the engine switch off, connect the GTS to the DLC3 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 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.

·

Before replacing the certification ECU (smart key ECU assembly), refer to smart entry and start system (for Entry Function) Precaution.

Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>SMART ENTRY AND START SYSTEM(for Entry Function)>PRECAUTION

·

After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

·

The front door outside handle assembly (for driver door) has an antenna coil between terminals ANT1 and ANT2.



PROCEDURE

1.CHECK CONNECTOR CONNECTION
a.

Turn the engine switch off.


b.

Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and front door outside handle assembly (for driver door).

OK:

Connectors are properly connected.



Result:
Proceed to
OK
NG



OK

2.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER DOOR))

NG

CONNECT CONNECTORS PROPERLY

2.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER DOOR))
a.

Disconnect the E108 and E110 certification ECU (smart key ECU assembly) connectors.


b.

Disconnect the G14 front door outside handle assembly (for driver door) connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
E110-12 (CLG1) - G14-6 (ANT1) Always Below 1 Ω
E110-13 (CG1B) - G14-3 (ANT2) Always Below 1 Ω
E108-11 (E) - Body ground Always Below 1 Ω
G14-2 (GND) - Body ground Always Below 1 Ω
E110-12 (CLG1) or G14-6 (ANT1) - Body ground Always 10 kΩ or higher
E110-13 (CG1B) or G14-3 (ANT2) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

3.CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO DRIVER SIDE ELECTRICAL KEY ANTENNA)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO DRIVER SIDE ELECTRICAL KEY ANTENNA)
a.

Connect the E108 and E110 certification ECU (smart key ECU assembly) connectors.


b.

Connect the G14 front door outside handle assembly (for driver door) connector.


c.

Using an oscilloscope, check the waveform.

B271427C74
2.146,0.594 2.542,0.823 0.396,0.229 4.76,0.594 5.135,0.823 0.375,0.229 2.708,1.51 2.51,2.063 2.51,2.063 2.26,2.063 false 5,1.406 5.281,2.375 5.281,2.375 5.583,2.375 false 4.833,1.406 4.552,2.375 4.552,2.375 4.25,2.375 false 0.198,0.146 0.417,0.344 0.219,0.198 10 false *a 1.198,2.823 1.417,3.021 0.219,0.198 10 false *b 0.969,3.635 1.333,3.802 0.365,0.167 10 false GND 3.854,3.635 4.219,3.802 0.365,0.167 10 false GND 4.146,2.823 4.365,3.021 0.219,0.198 10 false *c 2.156,1.979 2.292,2.146 0.135,0.167 10 false E 5.625,2.292 6.031,2.458 0.406,0.167 10 false CLG1 3.844,2.292 4.25,2.458 0.406,0.167 10 false CG1B 2.188,0.625 2.594,0.875 0.406,0.25 10 false E108 4.792,0.625 5.198,0.823 0.406,0.198 10 false E110
*a Component with harness connected
(Certification ECU (Smart Key ECU Assembly))
*b Waveform 1
*c Waveform 2 - -


OK:
Tester Connection Condition Tool Setting Specified Condition
E110-12 (CLG1) - E108-11 (E) Procedure:
1.

Engine switch off

2.

Electrical key transmitter sub-assembly brought outside vehicle

3.

All doors closed

4.

Electrical key transmitter sub-assembly not inside vehicle

5.

Electrical key transmitter sub-assembly brought inside detection area*1

6.

All doors locked through wireless operation


2 V/DIV., 500 ms/DIV. Pulse generation
(See waveform 1)
E110-12 (CLG1) - E108-11 (E) Procedure:
1.

Engine switch off

2.

Electrical key transmitter sub-assembly brought outside vehicle

3.

All doors closed

4.

Electrical key transmitter sub-assembly not inside vehicle

5.

Electrical key transmitter sub-assembly brought outside detection area*2

6.

All doors locked through wireless operation


2 V/DIV., 500 ms/DIV. Pulse generation
(See waveform 2)
E110-13 (CG1B) - E108-11 (E) Procedure:
1.

Engine switch off

2.

Electrical key transmitter sub-assembly brought outside vehicle

3.

All doors closed

4.

Electrical key transmitter sub-assembly not inside vehicle

5.

Electrical key transmitter sub-assembly brought outside detection area*2

6.

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 inside the entry function detection area, refer to Operation Check.

Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>SMART ENTRY AND START SYSTEM(for Entry Function)>OPERATION CHECK

·

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

Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>SMART ENTRY AND START SYSTEM(for Entry Function)>OPERATION CHECK



Result:
Proceed to
OK
NG



OK

4.REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER DOOR)

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

4.REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER DOOR)
a.

Temporarily replace the front door outside handle assembly (for driver door) with a new or known good one.

Click hereVehicle Exterior>DOOR / HATCH>FRONT DOOR>DISASSEMBLY


Result:
Proceed to
NEXT



NEXT

5.CLEAR DTC
5.CLEAR DTC
a.

Clear the DTCs.

Body Electrical > Entry&Start > Clear DTCs
50002 125

Result:
Proceed to
NEXT



NEXT

6.CHECK FOR DTC
6.CHECK FOR DTC
a.

Check for DTCs.

Body Electrical > Entry&Start > Trouble Codes
50001 125
OK:

DTC B27A1 is not output.



Result:
Proceed to
OK
NG



OK

END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER DOOR) WAS DEFECTIVE)

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)