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 when Malfunction Detected | Fail-safe Operation when Malfunction Detected |
---|---|
Entry lock/unlock operation cannot be performed for driver door | - |
DTC Code | Data List and Active Test Item |
---|---|
B27A1 | Key diagnostic mode can be used to perform troubleshooting |
WIRING DIAGRAM
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.
·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.
·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
Turn the engine switch off.
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
NG
Disconnect the E108 and E110 certification ECU (smart key ECU assembly) connectors.
Disconnect the G14 front door outside handle assembly (for driver door) connector.
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
NG
Connect the E108 and E110 certification ECU (smart key ECU assembly) connectors.
Connect the G14 front door outside handle assembly (for driver door) connector.
Using an oscilloscope, check the waveform.
*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.
*2: For details about the areas that are outside the entry function detection area, refer to Operation Check.
- Result:
Proceed to OK NG
OK
NG
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
Clear the DTCs.
- Body Electrical > Entry&Start > Clear DTCs
- 50002 125
- Result:
Proceed to NEXT
NEXT
Check for DTCs.
- Body Electrical > Entry&Start > Trouble Codes
- 50001 125
- OK:
DTC B27A1 is not output.
- Result:
Proceed to OK NG
OK
NG