DTC B27A5: Open in Front Floor Electrical Key Oscillator Circuit [11/2018 - ]: Procedure
WARNING: This page is about a different variant/trim than selected.
- CHECK CONNECTION OF CONNECTOR
- 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).
Result
Result Proceed to The connectors are properly connected A The connectors are not properly connected B
Result:
B
CONNECT CONNECTORS PROPERLY
Result:
A
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 (front floor).
- CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR))
- Disconnect the G54 certification ECU (smart key ECU assembly) connector.
- Disconnect the G59 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 G54-8 (CLG5) - G59-1 (ANTE5) Always Below 1 Ω G54-9 (CG5B) - G59-3 (CLGB) Always Below 1 Ω - Reconnect the G54 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 (FRONT FLOOR))
*a Component with harness connected
(Certification ECU (Smart Key ECU Assembly))*b Waveform *c For 30 seconds after any door closed *d After 30 seconds or more have elapsed since any door closed - Using an oscilloscope, check the waveform.
OK
Tester Connection Condition Tool Setting Specified Condition G54-8 (CLG5) - G54-18 (E) Procedure: - Power switch off
- Electrical key transmitter sub-assembly not inside vehicle
- Within 30 seconds of closing any door
2 V/DIV., 500 ms./DIV. Pulse generation
(See waveform)G54-9 (CG5B) - G54-18 (E) Procedure: - Power switch off
- Electrical key transmitter sub-assembly not inside vehicle
- Within 30 seconds of closing any door
2 V/DIV., 500 ms./DIV. Pulse generation
(See waveform)Result
Proceed to OK NG
Result:
OK
REPLACE NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR). Refer to REMOVAL [11/2018 - ]
Result:
NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to REMOVAL [11/2018 - 02/2019] , or refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021] , or refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]
- Using an oscilloscope, check the waveform.