The B1442 code on your 2023 Infiniti Q50 indicates a fault with the rear left window regulator motor circuit. This code affects your Q50's rear passenger window operation, signaling an electrical or mechanical issue preventing normal function.
Understanding B1442 on Infiniti Q50
The rear window motors are controlled through the BCM (Body Control Module) and respond to both the driver master switch and rear passenger switch. Code B1442 indicates the system has detected abnormal operation in the rear left window circuit.
Common Symptoms
- Rear left window inoperative
- Window operates slowly or erratically
- Window stops mid-position
- Grinding or clicking sounds
- Window won't respond from any switch
- Auto up/down doesn't work
Primary Causes
- Window motor failure
- Regulator cable or gear failure
- Rear door switch fault
- Wiring damage in rear door
- BCM circuit fault
- Window off track or binding
- Excessive resistance in circuit
Diagnostic Procedure for 2023 Q50
Using Nissan/Infiniti Consult or compatible scan tool, access window motor data for rear left. Test operation from driver master switch and rear switch. Listen for motor operation. Check power at motor during operation. Inspect rear door wiring through jamb area. Examine regulator mechanism by removing door panel if needed.
Repair Solutions
Replace failed window motor/regulator assembly. Repair wiring damage in door or jamb. Replace faulty rear door window switch. Realign window if off track. Lubricate window channels if binding. After repair, perform window initialization for auto function. Clear codes and verify operation from all switches.