What Does B1414 Mean?
This code indicates that the Body Control Module (BCM) has detected an electrical fault in the left rear power window motor circuit. The BCM monitors voltage, current draw, and circuit continuity when commanding the window motor to operate, and has identified an abnormal condition such as an open circuit, short to ground, short to power, or excessive current draw. This is a manufacturer-specific body code that relates specifically to the electrical control and operation of the left rear door window motor system.
Common Causes
40%
Faulty left rear window motor with internal winding failure, worn brushes, or seized mechanism causing excessive current draw
30%
Damaged or corroded wiring harness between BCM and left rear window motor, including broken wires or poor connections at door hinge flex point
20%
Failed left rear window switch with internal short or open circuit preventing proper motor control signal
10%
Corroded or loose connector terminals at window motor, door module, or BCM causing intermittent or high resistance connection
Diagnostic Steps
1
Step 1: Perform visual inspection of left rear window motor connector for corrosion, pushed-back pins, or water intrusion. Check for obvious damage to wiring harness in door jamb flex area where wires repeatedly bend during door operation.
2
Step 2: Using a digital multimeter, disconnect the window motor connector and measure resistance across motor terminals (typically 3-8 ohms for most motors). Apply 12V directly to motor terminals to verify motor operation and direction; motor should run smoothly in both directions.
3
Step 3: With ignition on and motor connector still disconnected, backprobe the harness-side connector and command window operation using appropriate scan tool bidirectional controls. Verify battery voltage (12-14V) and ground (less than 0.5V) are switching properly at the harness connector during up/down commands.
4
Step 4: Check for voltage drops in the power and ground circuits by measuring voltage at the BCM connector pins for left rear window circuit while commanding motor operation. Voltage drop exceeding 0.5V indicates high resistance in wiring or connections.
5
Step 5: If wiring and motor test good, inspect window regulator for binding, damaged tracks, or obstruction that would cause excessive motor load. Manually move window through full range of motion with regulator disconnected to check for mechanical resistance.
6
Step 6: After repairs, clear codes, cycle window through full up/down operation multiple times, and verify proper BCM auto-up/auto-down initialization procedure if equipped. Re-scan for codes to confirm repair.
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) has detected an electrical fault in the left rear power window motor circuit. The BCM monitors voltage, current draw, and circuit continuity when commanding the window motor to operate, and has identified an abnormal condition such as an open ci...
The most common cause of B1414 (Power Window LR Motor Circuit Failure) is: Faulty left rear window motor with internal winding failure, worn brushes, or seized mechanism causing excessive current draw
Typical repair costs for B1414 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this only affects window convenience operation. Repair at earliest convenience, especially if window is stuck in down position which could allow water entry or present a security concern.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1414 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Convenience Systems
Difficulty
Type
Manufacturer
Recommended Tools
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