B15F9 UART line to the multi-media module reads open
What does B15F9 mean on a Toyota?
B15F9. UART line to the multi-media module reads open. This Toyota-enhanced code applies to Toyota, Lexus and Scion models that use this code.
Common causes of B15F9
- Failed multi-media module receiver assembly
- UART communication line open
- Poor electrical connection
- Damaged communication harness
- Failed radio receiver assembly
How to fix B15F9
- Confirm the code and check audio operation
- Inspect and reseat the module connectors
- Test the UART line for an open
- Check power and ground at the module
- Replace the module only after tests fail