2004 GMC Envoy XL - Answered Questions & Fixed issues

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what switch theirs only about 7

Do they stay on after key is removed from ignition lock cylinder ? Check HDM relay 46 in the under hood fuse / relay box . Relay contacts stuck closed , possibly ! The relay supplies B+ voltage to the low beam fuse's ! Let me know if that works or not . If not , will go on too more diagnostics steps .

This is normal. All vehicles idle high at start up to get the engine to operating temperature. This is known as open loop. The computer ignores signals from O2 sensors to keep your engine running safely. Once it has warmed up, it will enter closed loop, and you will see a decrease in idle.

Yes if it is not adjusted properly

First look for corrosion at the motor plug. After that, replace the wiper motor. The wiper module is built in it.

It's in order, from the front of the motor to the firewall. #1 is nearest to the radiator, # 6 is at the firewall.

The way that the bumpers are made now, U will be lucky if that is all U get away with, better look again a little closer.

3 possible reasons your foot is riding the breaks the caliper is frozen ...most probable reason the brake line hose coupler into the caliper is defective

Majority on the trans...Autozone auto manual...for location

i know few error codes/ fault codes, wiring diagrams, schematic diagrams, torque specs, engine fo, switches functioning, assemble, disassembly, complete refurbish, repair, installation every single thing is covered within seconds u can get the access and it's totally illustrative complete

The testing procedure is fairly long ,to much to post here . The first test would be to hook up a factory or some other professional type scan tool an check for DTC'S - diagnostic trouble codes . Auxiliary HVAC Control Module The auxiliary HVAC control module is a class 2 device that interfaces between the rear seat occupants and the auxiliary HVAC system to maintain auxiliary air temperature and auxiliary air distribution settings. The battery positive voltage circuit provides power that the control module uses for keep alive memory (KAM). If the battery positive voltage circuit loses power, all auxiliary HVAC DTCs and settings will be erased from KAM. The auxiliary HVAC control module will perform a recalibration of the electric actuators when commanded with a scan tool or if KAM is lost. This will ensure the actuators are moving with in the calibrated range. During this calibration process the auxiliary blower motor will be disabled for up to 3 minutes. Do you know what class 2 is ? It is a serial data network for the control modules to talk to each other . Air Distribution - Auxiliary Control The auxiliary HVAC system provides ventilation for the rear seat occupants. The auxiliary mode actuator shares a control circuit with the auxiliary air temperature actuator. The auxiliary mode is controlled by a rotary knob on the auxiliary HVAC control module. If change of position is required for both actuators, then the auxiliary HVAC control module positions the auxiliary air temperature actuator first. All control circuits for the auxiliary actuators are at a low voltage potential until a change of position is required. The module then applies a high voltage potential to the appropriate control circuit, which will rotate the actuator. Air Speed - Auxiliary There are two separate controls for the auxiliary HVAC system. There is the front auxiliary blower motor switch and the auxiliary HVAC control module. If the front auxiliary blower motor switch is in any other position than OFF or REAR, then the auxiliary air temperature actuator mimics the set passenger temperature. The auxiliary mode will mimic the primary mode. If the front auxiliary blower motor switch is in the REAR position, then the system will only function with inputs to the auxiliary HVAC control module. If the front auxiliary blower motor switch is in the OFF position, then the auxiliary HVAC control module does not respond to input. The auxiliary HVAC control module can not request A/C operation from the PCM. The rotary blower switch on the auxiliary HVAC control module provides the operator the ability to select several blower speeds. The auxiliary HVAC control module provides a pulse width modulated (PWM) signal to the auxiliary blower motor through the auxiliary blower motor speed control circuit. The auxiliary blower motor changes speed based on the received PWM signal from the auxiliary HVAC control module. Power and ground are provided to the auxiliary blower motor through the battery positive voltage and ground circuits. Power and ground are provided to the auxiliary HVAC control module by the ignition 3 voltage and the ground circuits. Auxiliary Console Mode Actuator The auxiliary console mode actuator is a 5 wire bi-directional electric motor that incorporates a feedback potentiometer. Low reference, 5 volt reference, position signal, and two control circuits enable the actuator to operate. The control circuits use either a 0 or 12 volt value to co-ordinate the actuator movement. When the actuator is at rest, both control circuits have a value of 0 volts. In order to move the actuator, the auxiliary HVAC control module grounds one of the control circuits while providing the other with 12 volts. The control module reverses the polarity of the control circuits to move the actuator in the opposite direction. When the actuator shaft rotates, the potentiometer's adjustable contact changes the door position signal between 0-5 volts. The auxiliary HVAC control module uses a range of 0-255 counts to index the actuator position. The door position signal voltage is converted to a 0-255 count range. When the module sets a commanded, or targeted, value, one of the control circuits is grounded. As the actuator shaft rotates the changing position signal is sent to the module. Once the position signal and the commanded value are the same, the module grounds both control circuits. Auxiliary Mode Actuator The auxiliary mode actuator is a 5 wire bi-directional electric motor that incorporates a feedback potentiometer. Low reference, 5 volt reference, position signal, and two control circuits enable the actuator to operate. The control circuits use either a 0 or 12 volt value to co-ordinate the actuator movement. When the actuator is at rest, both control circuits have a value of 0 volts. In order to move the actuator, the auxiliary HVAC control module grounds one of the control circuits while providing the other with 12 volts. The control module reverses the polarity of the control circuits to move the actuator in the opposite direction. When the actuator shaft rotates, the potentiometer's adjustable contact changes the door position signal between 0-5 volts. The auxiliary HVAC control module uses a range of 0-255 counts to index the actuator position. The door position signal voltage is converted to a 0-255 count range. When the module sets a commanded, or targeted, value, one of the control circuits is grounded. As the actuator shaft rotates the changing position signal is sent to the module. Once the position signal and the commanded value are the same, the module grounds both control circuits. It's nice to know how thing's work before trying to fix it .

Es el resistor del motor del soplador debajo de la guantera, muy com?n

There may be a small hole or cut in a vacum line or possibly just loose. Also make sure the air filter box and the big hose to it are secure and clamps etc are tight. Pulleys and belts can make a high pitch sound also.

milky oil in commodore enigine or any engine is the sign off leaking head gaskets or cracked cylinder heads and the coolant and oil are mixing which is the cause of the milky coloured oil

Take it back. they replaced it, they diagnosed it. they should fix it right... I do this. Wires, plugs and computers. If I misdiagnose something and tell you it will fix it. But it doesn't, now the burden is on me to make it right. You already paid for the service. Take it back and make them fix it. If it were me , I would tell you to bring it back. Plus give you transportation. until it was done. On my dime..This is why I do a thorough diagnoses...Do it once, the first time.

P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input

P0130 02 Sensor Circuit Malfunction (Bank I Sensor 1)

P0135 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

P0171 System too Lean (Bank 1)

Check your Manifold Absolute Pressure Sensor, and it might be a good time to install a new Upstream O2 Sensor.

It might also be beneficial to have your fuel pressure checked if the engine is really running Lean, but this may be caused by a faulty O2 sensor.
I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

If you have an active headphone jack, just plug in some PC speakers. I don't know how best to mount them or what kind of volume you'd get out of them but that would be quick, cheap, and easy.