Driver Power Window Motor Circuit Malfunction
What does B1303 mean?
The B1303 code means the vehicle's onboard diagnostic system has detected: Driver Power Window Motor Circuit Malfunction. This is a low severity code.
Common Symptoms
- Driver window not going up or down
- Window moves slowly or erratically
- Grinding noise from door when using window switch
- Window drops into door panel
- Window switch unresponsive
Probable Causes (Ranked by Likelihood)
- Failed power window motor Very High
- Faulty window regulator assembly High
- Defective driver window switch Moderate
- Blown window motor fuse Moderate
- Damaged wiring in driver door Low
Step-by-Step Diagnostic Procedure
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Check power window fuse
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Test driver window switch with scan tool or multimeter
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Listen for motor running when switch is pressed
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Inspect window regulator for cable or track damage
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Apply direct power to window motor to test
Frequently Asked Questions
Why does my window fall down into the door?
This is usually caused by a broken window regulator cable or clip. The regulator holds the window glass in position, and when it breaks, the glass drops inside the door panel.
Can I still use the window manually?
No. Power windows do not have manual backup. If the motor or regulator fails, the window cannot be moved until the faulty component is replaced.
Should I replace the motor and regulator together?
It is recommended to replace both together since they work as a system and the labor to access them is the same. Replacing just one may lead to the other failing soon after.