What Does B1418 Mean?
This code indicates the Body Control Module (BCM) has detected an abnormal electrical condition in the passenger side power window motor circuit. The BCM monitors current flow, voltage, and resistance in the window motor circuit and sets this code when values fall outside acceptable parameters. This typically occurs due to excessive current draw, open circuits, short circuits, or complete loss of communication with the window motor.
Common Causes
35%
Failed or binding passenger window motor causing excessive current draw or internal short circuit
30%
Damaged or corroded wiring harness between BCM and window motor, including chafed wires in door jamb
20%
Faulty passenger window switch with internal short or open circuit
10%
Corroded or loose electrical connectors at motor or BCM causing high resistance
5%
Failed BCM with internal driver circuit damage for window motor control
Diagnostic Steps
1
Step 1: Perform visual inspection of passenger door wiring harness from door jamb to motor, checking for chafed, pinched, or damaged wires. Inspect all connectors for corrosion, moisture intrusion, or pushed-back pins.
2
Step 2: Using a digital multimeter, test power and ground at the window motor connector with ignition on and window switch activated. Expect battery voltage (12-14V) on power supply wire and less than 0.5V on ground circuit when switch is pressed.
3
Step 3: Disconnect window motor and measure motor resistance across terminals using ohmmeter. Typical resistance should be 3-8 ohms. Infinite resistance indicates open motor winding, while near-zero resistance suggests short circuit.
4
Step 4: With motor disconnected, operate window switch while monitoring voltage at motor connector. If voltage is present and correct but motor was faulty, replace motor. If no voltage present, test switch operation and continuity through door harness.
5
Step 5: If wiring and motor test good, check for voltage and ground at BCM connector terminals for window motor circuit. Compare readings with manufacturer specifications to isolate BCM internal fault.
6
Step 6: After repairs, clear codes, cycle window through full up/down operation multiple times, and verify code does not return. Perform auto-up/auto-down relearn procedure if applicable.
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an abnormal electrical condition in the passenger side power window motor circuit. The BCM monitors current flow, voltage, and resistance in the window motor circuit and sets this code when values fall outside acceptable parameters. This...
The most common cause of B1418 (Passenger Power Window Motor Circuit Failure) is: Failed or binding passenger window motor causing excessive current draw or internal short circuit
Typical repair costs for B1418 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This code does not affect vehicle safety or drivability and the vehicle is safe to operate. Repair is not urgent but should be addressed for convenience and to prevent potential water intrusion if window cannot be raised.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1418 to identify the root cause.
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Quick Info
Category
Body
System
Body Electrical System
Difficulty
Type
Manufacturer
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