Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Lexus RC F BaseFACTORY OEM SERVICE PROCEDURE
Safety Connect System
SAFETY CONNECT SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [09/2014 - 11/2017]
| DTC Code | Description |
|---|---|
| B1570 | Manual (SOS) Switch Red Indicator Malfunction |
| B1571 | Manual (SOS) Switch Green Indicator Malfunction |
| B1572 | Telephone Microphone Error |
| B1573 | Short in Telephone Antenna Circuit |
| B15A8 | Telematics Transceiver Malfunction |
| B15C0 | Short in GPS Antenna |
| B15C1 | Open in GPS Antenna |
| B15C4 | Airbag Signal Malfunction/Not Input |
| B15C5 | Manual Button Malfunction |
| B15CB | Telematics Transceiver Antenna Disconnected |
SAFETY CONNECT SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [11/2017 - 09/2020]
| DTC Code | Description |
|---|---|
| B1536 | Short in Telephone SUB Antenna Circuit |
| B1537 | Open in Telephone SUB Antenna Circuit |
| B1570 | Manual (SOS) Switch Red Indicator Malfunction |
| B1571 | Manual (SOS) Switch Green Indicator Malfunction |
| B1572 | Telephone Microphone Error |
| B1573 | Short in Telephone Antenna Circuit |
| B15A8 | Telematics Transceiver Malfunction |
| B15C0 | Short in GPS Antenna |
| B15C1 | Open in GPS Antenna |
| B15C4 | Airbag Signal Malfunction/Not Input |
| B15C5 | Manual Button Malfunction |
| B15CB | Telematics Transceiver Antenna Disconnected |
| B15CC | Backup Battery Failure |
| B15EC | Backup Battery Degradation |
SAFETY CONNECT SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [09/2020 - ]
| DTC Code | Description |
|---|---|
| B1537-11 | Telephone Sub Antenna Circuit Short to Ground |
| B1537-13 | Telephone Sub Antenna Circuit Open |
| B1570-11 | Indicator (Red) Circuit Short to Ground |
| B1570-13 | Indicator (Red) Circuit Open |
| B1571-11 | Indicator (Green) Circuit Short to Ground |
| B1571-13 | Indicator (Green) Circuit Open |
| B1572-13 | Microphone Circuit Open |
| B15A8-04 | DCM System Internal Failure |
| B15C1-11 | GNSS Antenna Circuit Short to Ground |
| B15C1-13 | GNSS Antenna Circuit Open |
| B15C4-64 | Airbag Signal Signal Plausibility Failure |
| B15C5-11 | Emergency Call Switch Circuit Short to Ground |
| B15C5-13 | Emergency Call Switch Circuit Open |
| B15CB-11 | Telephone Main Antenna Circuit Short to Ground |
| B15CB-13 | Telephone Main Antenna Circuit Open |
| B15CC-49 | Backup Battery Internal Electronic Failure |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.