Blower motor will not go on i tried a new control a new blower motor i have juice to both termials on blower motor yet blower motor will not operate

Probably something going on with the blower motor control Processor . Hooking a scan tool an checking for DTC'S - diagnostic trouble codes would be the first step in a diagnostic procedure for a problem like this .

Auxiliary Blower Motor Control Processor
The auxiliary blower motor control processor is an interface between the auxiliary HVAC control module and the rear blower motor. The auxiliary blower motor control processor monitors supply voltage and ground circuits to the rear blower motor. The auxiliary HVAC control module provides a pulse width modulation (PWM) signal to the control processor in order to command the blower motor speed. The auxiliary blower motor control processor uses the blower motor ground as a low side control to adjust the blower motor speed.
The blower motor forces air to circulate within the vehicles interior. The vehicle operator determines the blower motors speed by placing the blower motor switch in a desired speed position or by selecting automatic operation. In manual operation, once a blower speed is selected, the blower speed remains constant, until a new speed is selected. In automatic operation, the HVAC control module will determine what blower speed is necessary in order to achieve or maintain a desired temperature.
As the requested blower speed increases, the following conditions occur:
• The HVAC control module increases the amount of time that the blower motor speed control circuit is modulated to ground.
• The voltage and duty cycle, measured between the blower motor speed control circuit and ground, decrease.
As the requested blower speed decreases, the following conditions occur:
• The HVAC control module decreases the amount of time that the blower motor speed control circuit is modulated to ground.
• The voltage and duty cycle, measured between the blower motor speed control circuit and ground, increase.

The actual fan switch for the blower and the whole control unit there could be a broken wire or the blend door actuator if everything else checks check what I have said in your answer

Automatic or manual climate control ?

• The blower motor does not operate correctly - manual climate control

• Circuitry short
• A/C blower motor resistor
• A/C blower motor switch
• Blower motor high speed relay

• Go To Pinpoint Test O .

• The blower motor does not operate correctly - EATC

• Circuitry short/open
• A/C blower motor speed control
• EATC module

• Go To Pinpoint Test Q .

Pinpoint Test Q: The Blower Motor Does Not Operate Correctly - EATC
Normal Operation Under normal operation, the blower motor control module receives a 1-2 volt signal from the EATC module through circuit CH218 (GN/VT) to determine the desired blower motor speed. The EATC module receives a feedback voltage from the blower motor control module through circuit VH219 (GY) to determine actual blower motor speed. When the highest blower motor setting is selected, the EATC module sends 12 volts to the blower control module through circuit CH217 (BN).

Possible Causes
• An open, short to voltage, ground or together in circuits CH218 (GN/VT), VH219 (GY) or circuit CH217 (BN)
• Blower motor control module
• EATC module
• If automatic HVAC system i would suspect Blower motor control module .

I would go to the motor itself, and locate the wires going to it.
Then, I would try to trace where those wires go, with the intent of finding a "plug-in".
I would then disconnect the plug-in, and with the ignition switch on , and the blower fan switch on, see if you are getting juice to the motor.
If not, it should not be the blower motor, it is something wrong before the juice gets there.
God bless your efforts.

I suggest you find your fuse/ relay center check fuses and try new relay, I think the relay is 75% at fault most of the time.
Blazerk from Altima forum suggest
Back probe the blower motor Blue/Yellow circuit and tap it to ground, if that doesn't make the blower operate, the blower motor/power transistor assembly is bad. When the blower motor does operate while grounding that circuit, the climate control panel may be faulty, repeat the test from the connector at the control panel to verify the wiring is not damaged. Also, When verifying voltage, Use the power and ground wires to the blower motor. Other grounds may give you faulty readings.
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2000 2003 Nissan Maxima Blower Motor Amplifier Resistor Replacement...

found this helpful answer from nissan mechanic on JustAnswer com

Most likely need a new blower motor resistor

if the blower is working when you jumper it at the motor you`ve eliminated the motor itself.if you have replaced the heater control with a new one or known good used one then the only thing is the blower motor resistor has gone bad.i`m surprised you did not check and replace this unit after jumping the blower motor.

I don't have a diagram for a 2008. On 2005 models the blower motor relay gets power from a 30amp fuse.
When the blower switch is in the high position the resistor is bypassed and power flows directly to the motor. The motor is grounded to the car.
The fan relay also gets power from a 7.5amp fuse and is controlled by the HVAC control on the dash.
Do you have power into and out of the relay?

did you remove and inspect the blower motor resistor - a bad one can stop the blower and make for some hot wires

Cadillac 1999 DeVille
If the front blower motor is not running with battery level power to it, you may have bad blower resistors which controls the speed of the motor.. Unfortunately the resistors are built-in the motor. You may have to replace the motor. If you remove the motor, you can recheck it by direct wiring power to it. OR you may have loose wires.
Also check the Heater and A/C Programmer module.

Here's some info I found from another posting.

Red is positive 12 volts coming from fuse of circuit breaker. The black wire is either the ground or the main hot wire going to the blower motor (3 pin connection only), and the gray wire (if is is small in size) is a variable voltage coming from the body control module requesting speed for the blower motor.The blower control module varies voltage on the main wire going to the blower motor, supposedly in accordance with the requested voltage from the body control module. Usually if all fuses are okay and present on the apprpriate wire of the blower control module, the a blower motor that will not run or stays running after the key is turned off is the fault of the blower control module. If the blower control module has failed the the cause must be determined (over amping blower motor) or else new blower control module may fail when powered up.Usually blower control modules have more than three wires. Usual connections are: B+ (battery voltage) GND (chassis or engine ground), two large wires going directly to blower motor (can be any color, but are usually 10 guage in size), and an optional wire that reports voltage level back to the body control module.