B1571 SOS switch green indicator fault
What does B1571 mean on a Toyota?
B1571. SOS switch green indicator fault. The telematics transceiver sees an open or short in the green indicator circuit. This Toyota-enhanced code applies to Toyota, Lexus and Scion models that use this code.
Common causes of B1571
- Open or short in the green indicator circuit
- Failed manual SOS switch
- Loose or corroded switch connector
- Damaged switch harness
- Failed telematics transceiver
How to fix B1571
- Confirm the code and check the SOS switch indicators
- Inspect and reseat the manual SOS switch connector
- Test the green indicator circuit for opens and shorts
- Check the switch operation
- Replace the failed part only after tests fail