DTC B27A2-13: Front Passenger Side Electrical Antenna Circuit Open [11/2021 - ]: Procedure
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2025 Lexus NX 350, 2025 Lexus NX 250, 2024 Lexus NX 350, 2024 Lexus NX 250, and 2023 Lexus NX 350. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK CONNECTOR CONNECTION
- Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and front door outside handle assembly (for front passenger door).
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 front door outside handle assembly (for front passenger door).
- CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR FRONT PASSENGER DOOR))
- Disconnect the D58 certification ECU (smart key ECU assembly) connector.
- Disconnect the E10 front door outside handle assembly (for front passenger door) connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition D58-10 (CLG2) - E10-5 (ANT1) Always Below 1 Ω D58-9 (CG2B) - E10-2 (ANT2) Always Below 1 Ω - Reconnect the D58 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 FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR FRONT PASSENGER DOOR))
*a Component with harness connected
(Certification ECU (Smart Key ECU Assembly))*b Waveform 1 *c Waveform 2 *d Waveform 3 *e Waveform 4 - - - Using an oscilloscope, check the waveform.
OK
Tester Connection Condition Tool Setting Specified Condition D58-10 (CLG2) - D58-29 (E) Procedure: - Ignition switch off
- All doors closed
- Electrical key transmitter sub-assembly not inside vehicle
- All doors locked through wireless operation (electrical key transmitter sub-assembly brought inside detection area*)
5 V/DIV., 500 ms./DIV. Pulse generation
(See waveform 1)Procedure: - Ignition switch off
- All doors closed
- Electrical key transmitter sub-assembly not inside vehicle
- All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*)
5 V/DIV., 500 ms./DIV. Pulse generation
(See waveform 2)D58-9 (CG2B) - D58-29 (E) Procedure: - Ignition switch off
- All doors closed
- Electrical key transmitter sub-assembly not inside vehicle
- All doors locked through wireless operation (electrical key transmitter sub-assembly brought inside detection area*)
5 V/DIV., 500 ms./DIV. Pulse generation
(See waveform 3)Procedure: - Ignition switch off
- All doors closed
- Electrical key transmitter sub-assembly not inside vehicle
- All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*)
5 V/DIV., 500 ms./DIV. Pulse generation
(See waveform 4)- *: For details about the entry function detection area, refer to Operation Check.
Refer to OPERATION CHECK [11/2021 - ]
Result
Proceed to OK NG
Result:
OK
REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR FRONT PASSENGER DOOR). Refer to DISASSEMBLY [11/2021 - ]
Result:
NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to REMOVAL [11/2021 - ]
- Using an oscilloscope, check the waveform.