DTC B27A5-13: Front Floor Electrical Key Oscillator Circuit Open [10/2022 - ]: Description
WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the No. 1 indoor electrical key antenna assembly (front floor). For the No. 1 indoor electrical key antenna assembly (front floor) to detect when the electrical key transmitter sub-assembly is in the cabin, the signal from the certification ECU (smart key ECU assembly) requesting a response from the electrical key transmitter sub-assembly is transmitted inside the vehicle. DTC B27A5-13 is stored by the certification ECU (smart key ECU assembly) when an open is detected between the certification ECU (smart key ECU assembly) and No. 1 indoor electrical key antenna assembly (front floor).
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from | Priority | Note |
|---|---|---|---|---|---|---|
| B27A5-13 | Front Floor Electrical Key Oscillator Circuit Open | An open is detected in the circuit between the certification ECU (smart key ECU assembly) and No. 1 indoor electrical key antenna assembly (front floor) (1 trip detection logic*). |
|
Smart Access | A | DTC Output Confirmation Operation:
|
- *: Only output while a malfunction is present.
VEHICLE CONDITION AND FAIL-SAFE OPERATION WHEN MALFUNCTION DETECTED
| Vehicle Condition when Malfunction Detected | Fail-safe Operation when Malfunction Detected |
|---|---|
When electrical key transmitter sub-assembly is in front seat area:
|
- |
RELATED DATA LIST AND ACTIVE TEST
| DTC No. | Data List and Active Test |
|---|---|
| B27A5-13 | Key diagnostic mode can be used to perform troubleshooting |