DTC B27A7: Open in Inside Luggage Compartment Electrical Key Oscillator Circuit [06/2018 - ]: Procedure
- CHECK CONNECTOR CONNECTION
- Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and No. 2 indoor electrical key antenna assembly (inside luggage compartment).
OK
Connectors are properly connected.
Result
Proceed to OK NG
Result:
NG
CONNECT CONNECTORS PROPERLY
Result:
OK
See step 2
- Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and No. 2 indoor electrical key antenna assembly (inside luggage compartment).
- CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT))
- Disconnect the N9 certification ECU (smart key ECU assembly) connector.
- Disconnect the N12 No. 2 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 N9-11 (CLG7) - N12-1 (ANTE7) Always Below 1 Ω N9-10 (CG7B) - N12-3 (CLGB) Always Below 1 Ω - Reconnect the N9 certification ECU (smart key ECU assembly) connector.
Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 3
- CHECK CERTIFICATION ECU (OUTPUT TO NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT))
*a Component with harness connected
(Certification ECU (Smart Key ECU Assembly))*b Waveform 1 *c Driver door lock sensor not touched *d Driver door lock sensor touched - Using an oscilloscope, check the waveform.
OK
Tester Connection Condition Tool Setting Specified Condition N9-11 (CLG7) - G47-18 (E) Procedure: - Door is closed
- Engine switch off
- Electrical key transmitter sub-assembly not inside vehicle
- Driver door lock sensor touched
2 V/DIV., 500 ms/DIV. Pulse generation
(See waveform 1)N9-10 (CG7B) - G47-18 (E) Procedure: - Door is closed
- Engine switch off
- Electrical key transmitter sub-assembly not inside vehicle
- Driver door lock sensor touched
2 V/DIV., 500 ms/DIV. Pulse generation
(See waveform 1)Result
Proceed to OK NG
Result:
OK
REPLACE NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT). Refer to REMOVAL [06/2018 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]
Result:
NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to REMOVAL [06/2018 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]
- Using an oscilloscope, check the waveform.