What Does B1409 Mean?
This code indicates that the Body Control Module (BCM) or Driver Door Module has detected an abnormal short-to-ground condition in the driver's power window up circuit. The control module sensed that the circuit voltage dropped to ground level when commanding the window motor to operate in the up direction, indicating unwanted current flow through an unintended ground path. This prevents proper window operation and triggers the fault code to protect the circuit from damage.
Common Causes
45%
Damaged or chafed wiring in the driver's door harness causing short to ground, typically at the door hinge area where wires flex
30%
Faulty driver power window switch with internal short to ground in the up position contact
15%
Failed window motor with internal winding short to motor housing/ground
10%
Water intrusion or corrosion in door module or connectors causing ground fault
Diagnostic Steps
1
Step 1: Perform visual inspection of driver door wiring harness at hinge area and door boot for obvious chafing, damage, or exposed wires contacting metal. Check for moisture intrusion in door panel and connectors.
2
Step 2: Disconnect the driver window motor connector and use a digital multimeter to measure resistance from the UP circuit wire at the BCM/door module connector (motor disconnected) to ground. Reading should be greater than 10k ohms; low resistance confirms short in wiring harness.
3
Step 3: If harness tests good, disconnect driver window switch and measure resistance from switch UP terminal to ground with switch in UP position. Should read open circuit (OL); low resistance indicates faulty switch requiring replacement.
4
Step 4: If wiring and switch test normal, reconnect components and isolate window motor by measuring resistance across motor terminals. Typical reading is 3-8 ohms; also check each motor terminal to motor housing ground - should read open circuit (OL). Low resistance to ground indicates failed motor.
5
Step 5: If intermittent fault suspected, wiggle-test door harness while monitoring circuit resistance, and check for water damage in door module by removing and inspecting for corrosion on circuit board and connector pins.
6
Step 6: After repair, clear codes, cycle window up and down multiple times to verify proper operation, then recheck for code reset to confirm repair success.
Estimated Repair Cost
$100 - $450
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) or Driver Door Module has detected an abnormal short-to-ground condition in the driver's power window up circuit. The control module sensed that the circuit voltage dropped to ground level when commanding the window motor to operate in the up di...
The most common cause of B1409 (Driver Power Window Up Circuit Short To Ground) is: Damaged or chafed wiring in the driver's door harness causing short to ground, typically at the door hinge area where wires flex
Typical repair costs for B1409 range from $100 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this only affects driver window operation convenience. Repair is not urgent unless window cannot close, which would compromise vehicle security and weather protection.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1409 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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