Cannot locate where the a/c clutch cycle switch is... there is no power in the wires to the clutch and fuses are okay.

Hey! If your 2002 Nissan Xterra attempted to start without the keys in the ignition after replacing the starter, there may be an issue with the electrical system or the starter installation. Here are a few things you can check:

1. Wiring connections: Double-check the wiring connections on the starter. Ensure that the positive and negative cables are securely attached to the appropriate terminals on the starter. Make sure there are no loose or exposed wires.
2. Starter solenoid: The starter solenoid is responsible for engaging the starter motor when the ignition key is turned. It's possible that the solenoid is malfunctioning or wired incorrectly. Check the solenoid connections and wiring to ensure they are properly connected and in the correct configuration.
3. Ignition switch: It's unusual for a vehicle to attempt to start without the keys in the ignition. There could be an issue with the ignition switch or the wiring related to the ignition system. Inspect the ignition switch and its wiring for any signs of damage or loose connections.
4. Security system: Some vehicles have a security system that can prevent unauthorized starting. If your Xterra is equipped with a security system, ensure that it is not causing the issue. Refer to the vehicle's manual or contact a Nissan dealership for instructions on troubleshooting the security system.
5. Starter replacement: If all the wiring connections and components appear to be in order, it's possible that the replacement starter is faulty or incompatible with your vehicle. Consider double-checking the specifications of the new starter to ensure it is the correct model for your Xterra.

If you are unsure or uncomfortable with performing these checks yourself, it is recommended to consult a professional mechanic or contact a Nissan dealership for assistance. They will have the expertise and tools necessary to diagnose and resolve the issue with your Xterra's starting system.

A/C compressor clutch get battery voltage from the A/C compessor clutch relay , location - under hood fuse box . Should be marked on inside of the fuse box lid (cover) Pressure switch - A/C pressure sensor . Get's battery voltage from the PCM - engine computer . 5 volt's is all it get's ,three wire sensor .

fuses blow because the current flow is in excess of the fuse rating and that is normally from a dead short in the circuit after the fuse
I suspect that the ac compressor rely is faulty and I would start looking in that area

There is a relay, refer to the owners manual for location in the under hood fuse and relay center.

There are a few reasons for the compressor not engaging. Lets start with the most common. low ac gas.A bad clutch on the compressor.Blown fuse.
Let is start with testing for low gas. (134a freon).Locate the dryer. this is on the passenger side of engine compartment. it looks like a tall cylinder, on the top side you will see a switch. unplug switch connector and jump the two terminals in connector with a piece of wire, this is the low pressure or cycling switch. you will be completing the circuit by jumping a wire across the terminals.If the compressor turns on when connectors are jumped then you are low on gas and the system needs recharging.
If the compressor does not urn on then check all fuses, if fuses are good then the next step is to go to compressor and test for power and ground. If you have power and a good ground on the connector to compressor then compressor clutch is bad.A bad clutch will some times blown fuses, so if you replace the fuse because it was blown and it blows again then clutch is bad.
Another test that will help is when you remove the connector from the cycling low pressure switch , test the connector. one wire on the connector should have power when ac is turned on,
Hope this helps let me know what the outcome is. Good day.
I have enclosed a picture of the switch and dryer to help you locate it.If you jump the terminals

Check System Fuse - A fuse is used to protect the brake light circuit from amperage overload. If the fuse has failed it will not allow the electrical current to continue to the brake lights. To check the fuse, first locate the brake light system fuse in the fuse panel which is either under the dash or under the hood in the power distribution center. Connect the test light to a ground like an engine or dash bracket and turn the ignition key to the "on" position. Using the test light probe both sides of the fuse. If the test light illuminates on both sides the fuse is okay continue onto the next step. If one side of the fuse illuminates the fuse has failed and needs to be replaced. If the fuse fails as soon as it is replaced or when you apply the brake pedal the brake light electrical circuit is shorted to ground. Rarely a system short can occur, a car repair manual is needed to find the wiring schematic for the brake light circuit. Once the brake light wiring has been located inspect and repair as needed.

Check Brake Light Bulbs - All cars have three brake light bulbs that create the brake light illumination affect. If all of these brake light bulbs fail no brake light operation will occur. I know what you're thinking, you might say all three brake lights at once? But in reality one brake light went out at a time and you did not notice. People only tend to notice something when they almost run into the back of your car to help persuade them to inform you the brake lights aren't working. Remove any of the brake light bulbs to confirm the bulb is okay or burned. After the bulb has been removed inspect the filament and replace if failed. If the brake light bulbs are okay continue to the next step.

Checking the Brake Light Switch - A control switch is used to connect the brake light electrical circuit. This switch is located near the brake pedal lever. Basic switches have just two wires, power in and power out to the turn signal switch. Use a test light that is grounded and with the key in the "on" position test for power at one side (wire) of the switch, then press the brake pedal while testing the opposite side (wire). It should illuminate the test light, if electrical power is connected through the switch go to the next step. If no power is detected through the switch the brake light switch has failed and replacement is required. If your car is equipped with more than two wires integrated into the brake light switch a car repair manual is needed to locate the proper brake light circuit wiring.

Put a jump wire in the high pressure switch plug. If the compressor works. replace the high pressure switch. Let me know and we can go from there.

YOU COULD HAVE OPEN OR SHORT IN THE BLACK YELLOW WIRE GOING TO AC COMPRESSOR CYCLING PRESSURE SWITCH. CHECK FOR A SHORT OR OPEN IN RED YELLOW WIRES AT THE AC PRESSURE CUTOFF SWITCH. USE VOLT METER AND CHECK FOR VOLTAGE AT BOTH SWITCHES. PROBLEM COULD BE IN THE EATC MODULE THAT SEND POWER TO PURPLE WIRE THAT FEEDS THE AC PRESSURE CUTOFF SWITCH AND AC CLUTCH CYCLING PRESSURE SWITCH THEN FEEDS THE AC COMPRESSOR CLUTCH SOLENOID.

If there is no "clicking noises" at all first you have to bypass the Clutch Start Switch. To do so remove two wires from the Start Switch and connect them together.
If it doesn't work trouble shoot starter and solenoid. With a wire connected to (+) terminal of the battery power up the solenoid, at the thin wire contact of the starter. You need another person to help you, in the cabin turning the ignition key in ON and start position. If starter and solenoid are O.K this will start your car. If not you have to replace the starter + solenoid assembly. Good Luck.
Sam from,
American Car Co.

The clutch cycle switch is on the accumulator by the A/C housing, it looks like a silver cylinder. You can replace the new cycle switch without discharging the system, just unscrew the old one and screw in the new one. Just make sure you hove the new switch ready and the O rings have oil on them, need to be quick so you don't lose that much R134.
After installing the new R134 check the R134 pressure and recharge if low. Good luck and hope this helps. Note: if the system is low on R134 the clutch will not activate or if the relay is bad too.
The relay is in the glove box, at the back of the glove box there is a access door labeled relay. There are three relay's in there, the fuel pump, rear brake light and the A/C. Think the middle one is the fuel pump and can't remember which is the brake light. If you have someone push on the brake's you can feel which relay is the brake light. You can always swap the relays around.
Good luck and hope this helps.