THEFT DETERRENT / KEYLESS ENTRY SMART ENTRY AND START SYSTEM(for Entry Function) B27A7 Open in Inside Luggage Compartment Electrical Key Oscillator Circuit

DESCRIPTION

The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the No. 3 indoor electrical key antenna assembly (inside luggage compartment). For the No. 3 indoor electrical key antenna assembly (inside luggage compartment) to detect when the electrical key transmitter sub-assembly is inside the luggage area, the signal from the certification ECU (smart key ECU assembly) requesting a response from the electrical key transmitter sub-assembly is transmitted inside the luggage compartment. DTC B27A7 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. 3 indoor electrical key antenna assembly (inside luggage compartment) (between terminals CLG7 and ANTE7, or terminals CG7B and CLGB).

DTC NO.	Detection Item	DTC Detection Condition	Trouble Area	Note
B27A7	Open in Inside Luggage Compartment Electrical Key Oscillator Circuit	An open circuit is detected in the circuit between the certification ECU (smart key ECU assembly) and No. 3 indoor electrical key antenna assembly (inside luggage compartment) (CLG7 - ANTE7, CG7B - CLGB) (1 trip detection logic*).	· Wire harness or connector · No. 3 indoor electrical key antenna assembly (inside luggage compartment) · 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
When electrical key transmitter sub-assembly is inside luggage compartment: · Electrical key transmitter sub-assembly locked inside vehicle	-

Related Data List and Active Test Item
DTC Code	Data List and Active Test Item
B27A7	Key diagnostic mode can be used to perform troubleshooting

WIRING DIAGRAM

5.531,0.448 6.448,0.646 0.917,0.198 10 false CLG7 1.323,0.448 2.24,0.646 0.917,0.198 10 false ANTE7 1.396,0.906 2.313,1.104 0.917,0.198 10 false CLGB 5.51,0.896 6.427,1.094 0.917,0.198 10 false CG7B 5.5,1.385 6.417,1.583 0.917,0.198 10 false E 5.083,1.823 6.896,2.344 1.813,0.521 10 false Certification ECU (Samrt Key ECU Assembly) 0.135,1.417 1.052,1.615 0.917,0.198 10 false L71 0.135,1.583 2.979,2.094 2.844,0.51 10 false No. 3 Indoor Electrical Key Antenna Assembly (Inside Luggage Compartment) 1.885,0.323 2.281,0.542 0.396,0.219 10 false 1 1.875,0.792 2.271,1.01 0.396,0.219 10 false 3 5.229,0.25 5.625,0.469 0.396,0.219 10 false 9 5.146,0.438 5.563,0.656 0.417,0.219 10 false E109 5.24,0.708 5.635,0.927 0.396,0.219 10 false 8 5.177,1.167 5.573,1.385 0.396,0.219 10 false 11 5.135,0.906 5.552,1.125 0.417,0.219 10 false E109 5.146,1.354 5.563,1.573 0.417,0.219 10 false E108

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 No. 3 indoor electrical key antenna assembly (inside luggage compartment) has an antenna coil between terminals ANTE7 and CLGB.

PROCEDURE

1.CHECK CONNECTOR CONNECTION

Turn the engine switch off.

Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and No. 3 indoor electrical key antenna assembly (inside luggage compartment).

OK:: Connectors are properly connected.

Result:

Proceed to
OK
NG

2.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT))

CONNECT CONNECTORS PROPERLY

2.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT))

Disconnect the E109 and E108 certification ECU (smart key ECU assembly) connectors.

Disconnect the L71 No. 3 indoor electrical key antenna assembly (inside luggage compartment) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
E109-9 (CLG7) - L71-1 (ANTE7)	Always	Below 1 Ω
E109-8 (CG7B) - L71-3 (CLGB)	Always	Below 1 Ω
E108-11 (E) - Body ground	Always	Below 1 Ω
E109-9 (CLG7) or L71-1 (ANTE7) - Body ground	Always	10 kΩ or higher
E109-8 (CG7B) or L71-3 (CLGB) - Body ground	Always	10 kΩ or higher

Result:

Proceed to
OK
NG

3.CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT))

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT))

Connect the E108 and E109 certification ECU (smart key ECU assembly) connectors.

Connect the L71 No. 3 indoor electrical key antenna assembly (inside luggage compartment) connector.

Using an oscilloscope, check the waveform.

2.135,0.542 2.51,0.771 0.375,0.229 3.354,0.542 3.729,0.771 0.375,0.229 3.698,1.406 3.448,2.135 false 2.708,1.521 2.563,2.083 false 3.781,1.396 4.031,2.125 false 1.24,2.76 1.458,2.958 0.219,0.198 10 false *b 0.271,0.125 0.49,0.323 0.219,0.198 10 false *a 0.979,3.625 1.344,3.792 0.365,0.167 10 false GND 2.24,4.365 2.458,4.563 0.219,0.198 10 false *c 3.031,4.375 3.25,4.573 0.219,0.198 10 false *d 2.5,2.115 2.635,2.469 0.135,0.354 10 false E 3.26,2.146 3.667,2.313 0.406,0.167 10 false CLG7 3.875,2.135 4.281,2.302 0.406,0.167 10 false CG7B 2.167,0.573 2.615,0.792 0.448,0.219 10 false E108 3.385,0.573 3.844,0.813 0.458,0.24 10 false E109

*a	Component with harness connected (Certification ECU (Smart Key ECU Assembly))	*b	Waveform
*c	Before driver door lock sensor touched	*d	After driver door lock sensor touched

OK:

Tester Connection	Condition	Tool Setting	Specified Condition
E109-9 (CLG7) - E108-11 (E)	Procedure: 1. Door is closed 2. Engine switch off 3. Electrical key transmitter sub-assembly not inside vehicle 4. Driver door lock sensor not touched → touched	2 V/DIV., 500 ms/DIV.	Pulse generation (See waveform 2)
E109-8 (CG7B) - E108-11 (E)	Procedure: 1. Door is closed 2. Engine switch off 3. Electrical key transmitter sub-assembly not inside vehicle 4. Driver door lock sensor not touched → touched	2 V/DIV., 500 ms/DIV.	Pulse generation (See waveform 2)

Result:

Proceed to
OK
NG

4.REPLACE NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT)

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

4.REPLACE NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT)

Temporarily replace the No. 3 indoor electrical key antenna assembly (inside luggage compartment) with a new or known good one.

Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>ELECTRICAL KEY OSCILLATOR(for Luggage Compartment)>REMOVAL

Result:

Proceed to
NEXT

5.CLEAR DTC

Clear the DTCs.

Body Electrical > Entry&Start > Clear DTCs: 50002 125

Result:

Proceed to
NEXT

6.CHECK FOR DTC

Check for DTCs.

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

OK:: DTC B27A7 is not output.

Result:

Proceed to
OK
NG

END (NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT) WAS DEFECTIVE)

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)