DTC B2784: Antenna Coil Open / Short [06/2018 - ]: Procedure
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, 2021 Lexus ES 300h, and 2020 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
- CLEAR DTC
Result:
NEXT
See step 2
- CHECK FOR DTC
- Perform "DTC Output Confirmation Operation" procedure.
- Check for DTCs.
Body Electrical > Smart Access > Trouble Codes
OK
DTC B2784 is not output.
Result
Proceed to OK NG
Result:
OK
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ]
Result:
NG
See step 3
- CHECK POWER SWITCH (OUTPUT)
- Using an oscilloscope, check the waveform.
*a Component with harness connected
(Power Switch)*b Waveform *c Waveform (detail) - - OK
Tester Connection Condition Tool Setting Specified Condition G49-8 (CODE) - G49-6 (AGND) Power switch off, power switch pressed with electrical key transmitter sub-assembly held near power switch* 1 V/DIV., 20 ms./DIV. Pulse generation
(See waveform)2 V/DIV., 100 μs./DIV. Pulse generation
(See waveform (detail))- *: Remove the transmitter battery before performing this inspection.
OK
The waveform is similar to that shown in the illustration.
Result
Proceed to OK NG
Result:
OK
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 - ]
Result:
NG
REPLACE POWER SWITCH. Refer to REMOVAL [06/2018 - 08/2021] , or refer to REMOVAL [08/2021 - ]
- Using an oscilloscope, check the waveform.