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 GX 460 BaseFACTORY OEM SERVICE PROCEDURE
Safety Connect System
SAFETY CONNECT SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [08/2015 - 08/2016]
| 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 |
| B1583 | GPS Signal Unreceived |
| 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 [08/2016 - 08/2018]
| 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 |
| B1583 | GPS Signal Unreceived |
| 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 [08/2018 - 08/2019]
| 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 |
| B15C6 | Ignition Switch Signal Malfunction |
| B15CB | Telematics Transceiver Antenna Disconnected |
| B15CC | Backup Battery Failure |
| B15EC | Backup Battery Degradation |
SAFETY CONNECT SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [08/2019 - 08/2021]
| 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 |
| B15C6 | Ignition Switch Signal Malfunction |
| B15CB | Telematics Transceiver Antenna Disconnected |
| B15CC | Backup Battery Failure |
| B15EC | Backup Battery Degradation |
SAFETY CONNECT SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION [08/2021 - ]
| 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
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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.
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