DTC B27A7: Open in Inside Luggage Compartment Electrical Key Oscillator Circuit [04/2018 - ]: Procedure
WARNING: This page is about a different variant/trim than selected.
- CHECK CONNECTOR CONNECTION
- Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and No. 1 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. 1 indoor electrical key antenna assembly (inside luggage compartment).
- CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT))
- Disconnect the K10 certification ECU (smart key ECU assembly) connector.
- Disconnect the K13 No. 1 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 K10-11 (CLG7) - K13-1 (ANTE7) Always Below 1 Ω K10-10 (CG7B) - K13-3 (CLGB) Always Below 1 Ω - Reconnect the K10 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 (SMART KEY ECU ASSEMBLY) (OUTPUT TO NO. 1 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 K10-11 (CLG7) - G40-18 (E) Procedure: - Door is closed
- Power 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)K10-10 (CG7B) - G40-18 (E) Procedure: - Door is closed
- Power 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. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE COMPARTMENT). Refer to REMOVAL [04/2018 - ]
Result:
NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to REMOVAL [04/2018 - 08/2021] , or refer to REMOVAL [08/2021 - ]
- Using an oscilloscope, check the waveform.