THEFT DETERRENT / KEYLESS ENTRY SMART ENTRY AND START SYSTEM(for Entry Function) B27A5 Open in Front Floor Electrical Key Oscillator Circuit
DESCRIPTION
The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the No. 1 indoor electrical key antenna assembly (front floor). For the No. 1 indoor electrical key antenna assembly (front floor) to detect when the electrical key transmitter sub-assembly is in the cabin, the signal from the certification ECU (smart key ECU assembly) requesting a response from the electrical key transmitter sub-assembly is transmitted inside the vehicle. DTC B27A5 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 No. 1 indoor electrical key antenna assembly (front floor) (between terminals CLG5 and ANTE5, or terminals CG5B and CLGB).
| DTC NO. | Detection Item | DTC Detection Condition | Trouble Area | Note |
|---|---|---|---|---|
| B27A5 | Open in Front Floor Electrical Key Oscillator Circuit | An open circuit is detected in the circuit between the certification ECU (smart key ECU assembly) and No. 1 indoor electrical key antenna assembly (front floor) (CLG5 - ANTE5, CG5B - CLGB) (1 trip detection logic*). | ·
Wire harness or connector ·
No. 1 indoor electrical key antenna assembly (front floor) ·
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 |
|---|---|
| When electrical key transmitter sub-assembly is in front seat area:
·
Power source mode does not change when engine switch pressed ·
Electrical key transmitter sub-assembly locked inside vehicle |
- |
| DTC Code | Data List and Active Test Item |
|---|---|
| B27A5 | 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 No. 1 indoor electrical key antenna assembly (front floor) has an antenna coil between terminals ANTE5 and CLGB.
PROCEDURE
Turn the engine switch off.
Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and No. 1 indoor electrical key antenna assembly (front floor).
- 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 L68 No. 1 indoor electrical key antenna assembly (front floor) connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition E110-3 (CLG5) - L68-1 (ANTE5) Always Below 1 Ω E110-2 (CG5B) - L68-3 (CLGB) Always Below 1 Ω E108-11 (E) - Body ground Always Below 1 Ω E110-3 (CLG5) or L68-1 (ANTE5) - Body ground Always 10 kΩ or higher E110-2 (CG5B) or L68-3 (CLGB) - 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 L68 No. 1 indoor electrical key antenna assembly (front floor) connector.
Using an oscilloscope, check the waveform.
| *a | Component with harness connected
(Certification ECU (Smart Key ECU Assembly)) |
*b | Waveform |
| *c | Door open | *d | After approximately 30 seconds after door closed |
- OK:
Tester Connection Condition Tool Setting Specified Condition E110-3 (CLG5) - E108-11 (E) Procedure:
1.Engine switch off
2.Electrical key transmitter sub-assembly not inside vehicle
3.Door opened
4.Door closed
5.Within 30 seconds
2 V/DIV., 500 ms/DIV. Pulse generation
(See waveform)E110-2 (CG5B) - E108-11 (E) Procedure:
1.Engine switch off
2.Electrical key transmitter sub-assembly not inside vehicle
3.Door opened
4.Door closed
5.Within 30 seconds
2 V/DIV., 500 ms/DIV. Pulse generation
(See waveform)
- Result:
Proceed to OK NG
OK
NG
Temporarily replace the No. 1 indoor electrical key antenna assembly (front floor) with a new or known good one.
Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>ELECTRICAL KEY OSCILLATOR(for Front Floor)>REMOVAL
- 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 B27A5 is not output.
- Result:
Proceed to OK NG
OK
NG