What Does B1412 Mean?
B1412 indicates the Body Control Module (BCM) has detected an unintended voltage source on the driver's side power window motor circuit, meaning the circuit is receiving battery voltage when it should not be. This suggests a short-to-power condition where the motor circuit wiring is making contact with a constant 12V power source. The BCM monitors current flow and voltage in the window motor circuit and sets this code when abnormal voltage is detected on either the up or down motor control lines.
Common Causes
45%
Damaged or chafed wiring harness in the door jamb area where wires flex during door opening/closing, causing bare wire contact with power circuits
25%
Failed window motor with internal short circuit causing motor windings to contact power supply internally
20%
Faulty master window switch with internal short circuit connecting motor output to battery voltage
10%
Water intrusion or corrosion in door-mounted connectors causing cross-circuit contamination between power and control circuits
Diagnostic Steps
1
Step 1: Disconnect the driver's door window motor connector and check if the fault code clears or becomes inactive using live data monitoring. If code clears, motor is faulty; if code persists, wiring or switch is at fault.
2
Step 2: With motor disconnected and ignition on, use a digital multimeter to measure voltage at both motor connector pins on the harness side. Both pins should read 0V with switch in neutral position; any battery voltage present indicates a short-to-power in wiring or switch.
3
Step 3: Inspect the door jamb wiring harness thoroughly for chafing, damage, or exposed copper where harness flexes between door and body. Pay special attention to areas where harness contacts metal edges or passes through grommets.
4
Step 4: If wiring appears intact, disconnect the master window switch and retest motor circuit for voltage. If voltage disappears, replace switch; if voltage remains, trace and repair short in harness between BCM and motor.
5
Step 5: After repair, reconnect all components, clear codes, and cycle the window up and down multiple times while monitoring live data to verify proper voltage control and confirm no abnormal current draw exceeding manufacturer specifications (typically 3-8 amps depending on vehicle).
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
B1412 indicates the Body Control Module (BCM) has detected an unintended voltage source on the driver's side power window motor circuit, meaning the circuit is receiving battery voltage when it should not be. This suggests a short-to-power condition where the motor circuit wiring is making contact w...
The most common cause of B1412 (Driver Power Window Motor Circuit Short To Battery) is: Damaged or chafed wiring harness in the door jamb area where wires flex during door opening/closing, causing bare wire contact with power circuits
Typical repair costs for B1412 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive as this affects convenience only, not vehicle safety systems. The window may not operate or could operate erratically. Repair at convenience, though water intrusion risk exists if window cannot be closed fully.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1412 to identify the root cause.
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Quick Info
Category
Body
System
Body Electrical System - Power Windows
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
