There is a wire which connects the lampholder to ground on the chassis. Either the wire is corroded, loose, or the socket for the lamp is corroded. Take the lamp out of the lampholder, and look carefully at the metal parts where the lamp connects to the lampholder. Do any look corroded, fuzzy, dirty, or loose? If not, trace the wire from the lampholder back to where it connects to the frame of the car, or the motor. Look for frayed, chafed, or kinked points on the wire. Check to make sure that the wire is securely attached to the lug where the screw or bolt attaches to the ground point. If none of these checks reveals a problem, take the vehicle to an automotive electrical specialist. I had the same problem with my J30. The driver side headlight would turn on/off. There is a "relay" that needs to be replaced. It is located on the inside sidewall of the front wheel of the driver side. It fixed the problem for me. Hope it works for you as well. There is a TSB (Technical Service Bulletin) on the headlamp relay of these cars. Nissan has updated the relay with better material contacts. The relay is located: Standing in front of the car: The very top right corner under the hood. Against the firewall, under the windshield, crammed up against the side of the car.
take it to the dealer
Depends on if the head needs replacing or resurfaced. It will not be cheap for sure on an Infinity.
2002 Infiniti Q45 headlight bulb replacement: Purchase the correct replacement headlight bulb(s) first, before disassembling the vehicle. See sources and related links below for replacement bulb information. Then consult your owner's manual for the headlight bulb replacement procedure. As simple as it sounds, the owner's manual is the best place to start for bulb replacement instructions and illustrations. You may want to consider replacing both left and right at the same time in order to keep brightness and color equal (optional).
fuel pump relay may need replacing
By the way this is a 2001 infinity QX4 By the way this is a 2001 infinity QX4
mine did that. it was a sympton of an ignition problem which was solved by replacing the entire distributor.
I am assuming that you want to know how to wire up a new radio replacing the Infinity radio that was in the vehicle. The URL below tells you how to do it in a Plymouth Voyager. http://www.installdr.com/InstallDocs/DCP/PDF/327001.pdf I also found the following URL helpful in explaining a lot abot the infinity system. http://allpar.com/stereo/infinity-guide.html
infinity
1 one infinity divided by infinity
Infinity.
Negative infinity plus negative infinity equals negative infinity.
No, infinity is not measurable, so infinity plus infinity is just the same as infinity.