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.

2016 Lexus CT 200h BaseFACTORY OEM SERVICE PROCEDURE

Safety Connect System

SAFETY CONNECT SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

DTC Code	Detection Item	See
B1570	Manual (SOS) Switch Red Indicator Malfunction	Refer to DTC B1570: Manual (SOS) Switch Red Indicator Malfunction [08/2014 - ]
B1571	Manual (SOS) Switch Green Indicator Malfunction	Refer to DTC B1571: Manual (SOS) Switch Green Indicator Malfunction [08/2014 - ]
B1572	Telephone Microphone Error	Refer to DTC B1572: Telephone Microphone Error [08/2014 - ]
B1573	Short in Telephone Antenna Circuit	Refer to DTC B1573: Short in Telephone Antenna Circuit; DTC B15CB: Telematics Transceiver Antenna Disconnected [08/2014 - ]
B15CB	Telematics Transceiver Antenna Disconnected	Refer to DTC B1573: Short in Telephone Antenna Circuit; DTC B15CB: Telematics Transceiver Antenna Disconnected [08/2014 - ]
B1583	GPS Signal Unreceived	Refer to DTC B1583: GPS Signal Unreceived [08/2014 - ]
B15A8	Telematics Transceiver Malfunction	Refer to DTC B15A8: Telematics Transceiver Malfunction [08/2014 - ]
B15C0	Short in GPS Antenna	Refer to DTC B15C0: Short in GPS Antenna; DTC B15C1: Open in GPS Antenna [08/2014 - ]
B15C1	Open in GPS Antenna	Refer to DTC B15C0: Short in GPS Antenna; DTC B15C1: Open in GPS Antenna [08/2014 - ]
B15C4	Airbag Signal Malfunction/Not Input	Refer to DTC B15C4: Airbag Signal Malfunction/Not Input [08/2014 - ]
B15C5	Manual Button Malfunction	Refer to DTC B15C5: Manual Button Malfunction [08/2014 - ]
B15CC	Backup Battery Failure	Refer to DTC B15CC: Backup Battery Failure [08/2014 - ]
B15EC	Backup Battery Degradation	Refer to DTC B15EC: Backup Battery Degradation [08/2014 - ]

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.