Were is the fuse and fusible link block in infiniti fx35 2003

What type headlamps ?
HEADLAMP (FOR USA) - XENON TYPE -..................46
HEADLAMP (FOR USA) - CONVENTIONAL TYPE -.
The headlamp operation is controlled by the lighting switch which is built into the combination switch and smart entrance control unit. And the headlamp battery saver system is controlled by the smart entrance control unit. OUTLINE NHEL0198S01 Power is supplied at all times I to headlamp LH relay terminals 1 and 3 I through 15A fuse (No. 68, located in the fuse and fusible link box), and I to headlamp RH relay terminals 1 and 3 I through 15A fuse (No. 69, located in the fuse and fusible link box), and I to smart entrance control unit terminal 49 I through 10A fuse [No. 13, located in the fuse block (J/B)]. When the ignition switch is in the ON or START position, power is supplied I to smart entrance control unit terminal 27 I through 10A fuse [No. 10, located in the fuse block (J/B)]. When the ignition switch is in the ACC or ON position, power is supplied I to smart entrance control unit terminal 26 I through 10A fuse [No. 1, located in the fuse block (J/B)] Ground is supplied I to smart entrance control unit terminals 43 and 64 I through body grounds M9, M25 and M87. Power Supply to Low Beam and High Beam NHEL0198S0101 When lighting switch is in 2ND or PASS position, ground is supplied I to headlamp LH relay terminal 2 from smart entrance control unit terminal 21 I through smart entrance control unit terminal 22, I from lighting switch terminal 12, and I to headlamp RH relay terminal 2 from smart entrance control unit terminal 59 I through smart entrance control unit terminal 60, I from lighting switch terminal 12. Headlamp relays (LH and RH) are energized and then power is supplied to headlamps (LH and RH).

From what I can see, you only have one fusible link, and it starts at the under hood fuse block, is shown as gray with white stripe, and it turns into a red/black wire carrying power to the instrument panel fuse block.
It probably originates at where the battery cable red wire connects to the under hood fuse block.

So when you turn the key to on, no dash warning lights and gauges turn on? Did you check the fuses with a voltmeter or test light? With key off, some fuses would have power at all times-brake lights, headlights, horn- but with key on, all fuses should show power.

Just off the battery is the Battery Junction Block, where the power is distributed to various circuits through Fusible Links. These connect to battery power with eyelet connectors at the Junction Block-looks like 5 or 6 Links leading off the Block. Even the small wire from the battery to the Block is a Fusible Link, but if your headlights work, this main Link must be okay. One of the Links from the Junction Block would be to the ignition switch. If your ignition switch has power, you may have a bad switch, but you need to check if it has power first. If no power to switch, check the Fusible Links. The diagram I am looking at does not show which one it is, unfortunately.

Fusible links.

Two places to check - first a fuse box, there should be a diagram on the inside of the cover - look for the one that says power windows, match it up by the number to the location and (you may want to use a fuse puller or carefully a pair of pliers) to pull out the fuse and check it. If all the fuses are fine, check the fusible link box. Now - I saw that on some of the Infinitis there is a reset switch on the regulator (or so it seems) and the regulator makes the window go up and down. Check out the two pictures and check those places first. A lot of the times it's just a fuse, fusible link/relay. Hope this helped.

Well, on SOME of the Infiniti's for sure. I'm not sure about the QX56. Check your fuse box, fusible links/relays also. Here's a pic of the regulator with the reset switch. 2003 2005 Infiniti G35 Coupe Power Window Reset Procedure Infinitihelp...

There is an Intelligent Power Distribution Module (IPDM), a Fuse & Relay Box, a Fusible Link Box, and a Fuse & Fusible Link Box, all of which are located at the right side of the engine compartment.
Then there is the Instrument Panel Junction Block, which is located behind the driver's side kick panel.

It all depends on how lucky you are today. Connecting the battery backwards can destroy some high-dollar stuff. If you are really lucky, you will only have a blown fuse (or fuses). Check both of your main fuse blocks on the left side of the engine compartment,
One of the boxes is called the "Fusible Link" box and the other is called the "Engine Compartment Junction Block" (J/B) (See picture below).
Your main circuits are protected by the 40 Amp and 80 Amp fusible links in the Fusible Link box and the 120 Amp Alternator Fuse in the Junction Block. You will most likely find one or more of these fuses/fusible links blown.