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.
1999 Infiniti QX4FACTORY OEM SERVICE PROCEDURE
Interior Light Operation Check
- Turn interior light switch to DOOR position. Open driver's door. If dome light operates, go to next step. If dome light does not operate, repair interior light system as necessary. See appropriate wiring diagram in ILLUMINATION/INTERIOR LIGHTS article.
- Ensure all doors are closed and interior light switch is in DOOR position. Using a voltmeter connected to ground, backprobe terminal No. 9 (Red/Black wire) at Smart Entrance Control Unit (SECU) harness connector. See Figure . If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Red/Black wire between SECU and interior light.
- Ensure all doors are closed and interior light switch is in DOOR position. Using a voltmeter connected to ground, backprobe terminal No. 9 (Red/Black wire) at Smart Entrance Control Unit (SECU) harness connector. When unlock button on remote controller is pressed, zero volts should exist for 30 seconds. Before unlock button is pressed and 30 seconds after unlock button is pressed, battery voltage should exist. If voltage is as specified, system is okay at this time. If voltage is not as specified, replace SECU.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.