What Does B1415 Mean?
B1415 indicates the Body Control Module (BCM) has detected an open circuit in the left rear (LR) power window motor circuit. This means there is a break in the electrical pathway preventing current flow to the window motor, either in the wiring harness, connections, or the motor itself. The BCM monitors circuit continuity and sets this code when it cannot complete the circuit during window operation attempts.
Common Causes
40%
Broken or corroded wiring in the door harness between the BCM/door switch and window motor
30%
Failed left rear window motor with open internal windings
20%
Loose, corroded, or disconnected connector at the window motor or BCM
10%
Failed window switch or master switch assembly with open contacts
Diagnostic Steps
1
Step 1: Perform visual inspection of the left rear door wiring harness, especially in the door hinge area and boot where wires flex. Look for broken, chafed, or pinched wires and check all connectors for corrosion, bent pins, or looseness
2
Step 2: Using a digital multimeter, check for continuity between the BCM connector pins (motor circuit terminals) and the left rear window motor connector with all connectors disconnected. Readings should show less than 5 ohms resistance on each wire; infinite resistance confirms an open circuit
3
Step 3: Test the left rear window motor directly by applying 12V from a known good power source and ground. The motor should operate in both directions when polarity is reversed. No operation indicates a failed motor
4
Step 4: Check for proper voltage at the window motor connector while activating the switch (BCM commanding operation). Should see battery voltage on one terminal and ground on the other when switch is activated in either direction
5
Step 5: Inspect and test the master window switch and individual rear window switch for continuity through all positions using a multimeter. Replace if open circuit is found within switch assembly
6
Step 6: After repairs, clear codes, cycle the window through full up/down operation multiple times, and verify code does not return using the scan tool's live data function
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
B1415 indicates the Body Control Module (BCM) has detected an open circuit in the left rear (LR) power window motor circuit. This means there is a break in the electrical pathway preventing current flow to the window motor, either in the wiring harness, connections, or the motor itself. The BCM moni...
The most common cause of B1415 (Power Window LR Motor Circuit Open) is: Broken or corroded wiring in the door harness between the BCM/door switch and window motor
Typical repair costs for B1415 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 does not affect vehicle operation or safety systems. Repair at convenience, though window functionality should be restored for security and weather protection purposes.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1415 to identify the root cause.
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Quick Info
Category
Body
System
Body/Convenience Systems
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