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.
DTC B1206: P/W Master Switch Communication Stop: Procedure
- CLEAR DTC
- Clear the DTC. Refer to DTC CHECK / CLEAR [09/2012 - ] .
NEXT: Go to next step
- CHECK FOR DTC
- Recheck for DTC. Refer to DTC CHECK / CLEAR [09/2012 - ]
.
OK
DTC B1206 is not output.
NG → See step 3
OK → See step 7
- Recheck for DTC. Refer to DTC CHECK / CLEAR [09/2012 - ]
.
- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - POWER WINDOW MASTER SWITCH)
- Disconnect the L11 ECU connector.
- Disconnect the N13 switch connector.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
Tester Connection Condition Specified Condition L11-10 (LIN2) - N13-17 (LIN1) Always Below 1 Ω L11-10 (LIN2) or N13-17 (LIN1) - Body ground Always 10 kΩ or higher
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
- Disconnect the L11 ECU connector.
- CHECK POWER WINDOW MASTER SWITCH (BATTERY VOLTAGE AND GROUND)
- Disconnect the N13 switch connector.
- Measure the resistance and voltage according to the value(s) in the table below.
Standard resistance
Tester Connection Condition Specified Condition N13-12 (GND) - Body ground Always Below 1 Ω Standard voltage
Tester Connection Condition Specified Condition N13-11 (B) - Body ground Always 11 to 14 V
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
- Disconnect the N13 switch connector.
- REPLACE POWER WINDOW MASTER SWITCH
- Temporarily replace the power window master switch with a new or normally functioning one. Refer to REMOVAL [09/2012 - ] .
NEXT: Go to next step
- CHECK FOR DTC
- Clear the DTC. Refer to DTC CHECK / CLEAR [09/2012 - ] .
- Recheck for DTC. Refer to DTC CHECK / CLEAR [09/2012 - ]
.
OK
DTC B1206 is not output.
NG → REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)
OK → END (POWER WINDOW MASTER SWITCH IS DEFECTIVE)
- USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2012 - ]
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.
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