B1206 Power window master switch communication stop. The LIN link to the main body ECU drops for more than 10 seconds

What does B1206 mean on a Toyota?

B1206. Power window master switch communication stop. The LIN link to the main body ECU drops for more than 10 seconds. This Toyota-enhanced code applies to Toyota, Lexus and Scion models that use this code.

Common causes of B1206

• Open or short in the LIN circuit between the power window master switch and the main body ECU
• Loose or corroded connector at the power window master switch
• Damaged harness on the LIN circuit between the power window master switch and the main body ECU
• Failed power window master switch
• Low system voltage

How to fix B1206

1. Confirm the code and read freeze frame data
2. Check battery voltage and the charging system
3. Inspect and reseat the power window master switch connector
4. Test the LIN circuit between the power window master switch and the main body ECU for opens and shorts
5. Replace the power window master switch only after the circuit tests fail