What Does B1403 Mean?
This code indicates that the Body Control Module (BCM) has detected an abnormal electrical condition in the driver's side power window up switch circuit. The BCM monitors the switch input and has identified either an open circuit, short circuit, or voltage reading outside expected parameters when the window up function is commanded. This is a body electrical system fault specific to the driver's door master switch assembly.
Common Causes
45%
Faulty driver's side master window switch assembly with internal contact failure or short circuit
30%
Damaged or corroded wiring between BCM and driver window switch, including connector pin corrosion
15%
Water intrusion or moisture damage in driver door switch panel causing circuit malfunction
10%
BCM internal fault or poor ground connection affecting window switch circuit monitoring
Diagnostic Steps
1
Step 1: Perform visual inspection of driver master window switch assembly for physical damage, wear, or signs of liquid intrusion. Remove switch panel and inspect connector terminals for corrosion, bent pins, or discoloration.
2
Step 2: Using a digital multimeter, backprobe the window up switch signal wire at the switch connector with ignition on. Check for proper voltage reference (typically 5V or 12V depending on manufacturer) and monitor voltage drop to ground when up switch is actuated. Expected reading should show circuit closing to ground (near 0V) when pressed.
3
Step 3: Disconnect driver window switch connector and measure resistance across the up switch terminals while manually actuating the switch. Resistance should change from open circuit (infinite ohms) to closed circuit (0-5 ohms) when pressed. If readings are incorrect, switch is faulty.
4
Step 4: Inspect door harness boot between door jamb and body for damaged wires, especially where harness flexes during door operation. Wiggle test wiring while monitoring switch circuit voltage for intermittent opens or shorts.
5
Step 5: Check BCM connector terminals and ground connections for corrosion or looseness. Verify ground circuit integrity by measuring resistance from BCM ground to battery negative (should be less than 1 ohm).
6
Step 6: After repairs, clear codes and cycle the window up switch 10-15 times while monitoring live data to confirm BCM recognizes proper switch operation and fault does not return.
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) has detected an abnormal electrical condition in the driver's side power window up switch circuit. The BCM monitors the switch input and has identified either an open circuit, short circuit, or voltage reading outside expected parameters when th...
The most common cause of B1403 (Driver Power Window Up Switch Circuit Failure) is: Faulty driver's side master window switch assembly with internal contact failure or short circuit
Typical repair costs for B1403 range from $75 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive. This fault only affects the driver window up function and does not impact vehicle operation or safety systems. Repair at convenience, though operation in inclement weather may be inconvenient 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 B1403 to identify the root cause.
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Quick Info
Category
Body
System
Body Electrical System
Difficulty
Type
Manufacturer
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