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 B1140
DTC B1140 : Driver's Power Window Position Detect Circuit Malfunction
| DTC Description | DTC |
|---|---|
| B1140 Driver's Power Window Position Detect Circuit Malfunction |
DTC (Door Multiplex Control Unit)
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .
- Problem verification
-1. Clear the DTCs with the HDS.
-2. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.
-3. Open and close the driver's power window by using the power window master switch manually.
-4. Check for DTCs with the HDS.
DTC Description DTC B1125 Driver's Power Window Motor A Pulse Malfunction B1126 Driver's Power Window Motor B Pulse Malfunction Is DTC B1125 or B1126 indicated?
YES
Troubleshoot DTC B1125 or B1126 .
NO
NO RELATED
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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.