Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2001 Infiniti Q45 BaseFACTORY OEM SERVICE PROCEDURE
Power Window System
- Perform self-diagnostic system check. See SELF-DIAGNOSTIC SYSTEM . If no fault codes or fault messages are indicated, go to next step.
- Turn ignition switch to RUN position. Operate all power windows from main switch and each independent window switch. If all power windows operate, go to next step. If all power windows are inoperative, perform DIAGNOSTIC PROCEDURE 1: IGNITION SWITCH ON SIGNAL CHECK under DIAGNOSTIC TESTS. See Figure . If one or more power windows are inoperative, go to step 4 . If all power windows are inoperative (except driver's window), perform DIAGNOSTIC PROCEDURE 2: POWER WINDOW LOCK SWITCH CHECK under DIAGNOSTIC TESTS. See Figure .
- Check power window lock switch operation. When power window lock switch is in LOCK position, all power windows should be inoperative, except for driver's window. When in UNLOCK position, all power windows should be operative from all independent window switches. If power window lock switch operation is normal, go to step 5 . If power window lock switch is inoperative, perform DIAGNOSTIC PROCEDURE 2: POWER WINDOW LOCK SWITCH CHECK under DIAGNOSTIC TESTS. See Figure .
- If affected power windows do not operate from main switch or independent window switch, perform DIAGNOSTIC PROCEDURE 5: POWER WINDOW REGULATOR CHECK under DIAGNOSTIC TESTS. See Figure . If affected power windows do not operate only when using its independent window switch, perform DIAGNOSTIC PROCEDURE 4: POWER WINDOW SUB-SWITCH CHECK under DIAGNOSTIC TESTS. See Figure . If affected power windows do not operate from main switch only, perform DIAGNOSTIC PROCEDURE 3: POWER WINDOW MAIN SWITCH CHECK under DIAGNOSTIC TESTS. See Figure .
- If power window automatic function operates, power window system is okay at this time. If power window automatic function does not operate, perform DIAGNOSTIC PROCEDURE 6: POWER WINDOW AUTOMATIC SWITCH CHECK and DIAGNOSTIC PROCEDURE NO. 8: POWER WINDOW ENCODER & LIMIT SWITCH CHECK under DIAGNOSTIC TESTS. See Figure and Figure .
- Turn ignition off. Operate power windows. If power window power delay function operates for 45 seconds, power window system is currently okay. If power window automatic power delay function does not operate, perform DIAGNOSTIC PROCEDURE NO. 7: POWER WINDOW FRONT DOOR SWITCH CHECK under DIAGNOSTIC TESTS. See Figure .
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.