JustAnswerhttps://www.justanswer.com > Car Questions
Aug 6, 2006 - Remove the front exhaust manifold pipe. Remove the intermediate shaft bolt/screw. Remove the oil level sensor. Remove the engine splash shield.
1 answer · Top answer: See Figure 5 Click image to see an enlarged view [http://www.autozone.co
Do you have a issue with starting the vehicle, slow crank? showing signs of a weak battery, driving at night with headlamps on, are they dim? Does the vehicle die after driving awhile because of no charging- discharged battery? Any messages on the DIC - driver info. center (service charging system) Check engine light illuminated. The charging system on that vehicle are not like charging systems of old, its computer controlled. It has different modes of operation. You may think you have an issue - but don't.
You see the voltmeter in the instrument cluster go below 13 - 14 volts or maybe lower . This computer-controlled system can charge as low as 11 volts or as high as 15 volts depending on the mode. This system will set DTC'S diagnostic trouble codes if it has a problem.
Charging System Description and Operation
Electrical Power Management (EPM) Overview
The EPM system is designed to monitor and control the charging system and send diagnostic messages to alert the driver of possible problems with the battery and generator. This EPM system primarily utilizes existing on-board computer capability to maximize the effectiveness of the generator, to manage the load, improve battery state-of-charge (SOC) and life, and minimize the system's impact on fuel economy. The EPM system performs three functions:
• It monitors the battery voltage and estimates the battery condition.
• It takes corrective actions by adjusting the regulated voltage.
• It performs diagnostics and driver notification.
The battery's condition is estimated during key-off and during key-on. During key-off the SOC of the battery is determined by measuring the open-circuit voltage. The SOC is a function of the acid concentration and the internal resistance of the battery, and is estimated by reading the battery open circuit voltage when the battery has been at rest for several hours.
The SOC can be used as a diagnostic tool to tell the customer or the dealer the condition of the battery. Throughout key-on the algorithm continuously estimates SOC based on adjusted net amp hours, battery capacity, initial SOC, and temperature.
While running, the battery's degree of discharge is primarily determined by a battery current sensor, which is integrated to obtain net amp hours.
In addition, the EPM function is designed to perform regulated voltage control (RVC) to improve battery SOC, battery life, and fuel economy. This is accomplished by using knowledge of the battery's SOC and temperature to set the charging voltage to an optimum battery voltage level for recharging without detriment to battery life.
The Charging System Description and Operation is divided into 3 sections. The first section describes the charging system components and their integration into the EPM. The second section describes charging system operation. The third section describes the instrument panel cluster operation of the charge indicator, driver information center messages and voltmeter operation.
Generator
The generator is a serviceable component. If there is a diagnosed failure of the generator it must be replaced as an assembly. The engine drive belt drives the generator. When the rotor is spun it induces an alternating current (AC) into the stator windings. The AC voltage is then sent through a series of diodes for rectification. The rectified voltage has been converted into a direct current (DC) for use by the vehicles electrical system to maintain electrical loads and the battery charge. The voltage regulator integral to the generator controls the output of the generator. It is not serviceable. The voltage regulator controls the amount of current provided to the rotor. If the generator has field control circuit failure, the generator defaults to an output voltage of 13.8 volts.
Body Control Module (BCM)
The BCM communicates with serial data with the engine control module (ECM) / powertrain control module (PCM) and the instrument panel cluster for EPM operation. The BCM determines the output of the generator and sends the information to the ECM/PCM for control of the generator field control circuit. It monitors the generator field duty cycle signal circuit information sent from the ECM/PCM for control of the generator. It monitors a battery current sensor, the battery positive voltage circuit, and estimated battery temperature to determine battery SOC. The BCM performs idle boost and load management operations.
Battery Current Sensor
The battery current sensor is a serviceable component that is connected to the negative battery cable at the battery. The battery current sensor is a 3 wire hall effect current sensor. The battery current sensor monitors the battery current. It directly inputs to the BCM. It creates a 10 volt PWM signal of 128 Hz with a duty cycle of 0-100%. Normal duty cycle is between 5-95%. Between 0-5% and 95-100% are for diagnostic purposes.
Engine Control Module (ECM) / Powertrain Control Module (PCM)
The ECM/PCM directly controls the generator field control circuit input to the generator. It monitors the generators generator field duty cycle signal circuit and sends the information to the BCM. The ECM/PCM will over ride the BCM control of the generator when one of the following conditions are met:
• The engine cooling fans are on high speed.
• There is a high fuel demand.
• The calculated ambient air temperature is less that 0°C (32°F).
Instrument Panel Cluster (IPC)
The IPC provides a means of customer notification in case of a charging system concern.There is two means of notification, a charge indicator and a driver information center message of SERVICE CHARGING SYSTEM and CHARGING SYSTEM/GENERATOR FAULT.
Charging System Operation
The purpose of the charging system is to maintain the battery charge and vehicle loads. There are 6 modes of operation and they include:
• Charge Mode
• Fuel Economy Mode
• Voltage Reduction Mode
• Start Up Mode
• Windshield Deice Mode
• Battery Sulfation Mode
The ECM/PCM controls the generator through the generator field control circuit. It monitors the generator performance through the generator field duty cycle signal circuit. The signal is a 5 volt PWM signal of 128 Hz with a duty cycle of 0-100%. Normal duty cycle is between 5-95%. Between 0-5% and 95-100% are for diagnostic purposes. The following table shows the commanded duty cycle and output voltage of the generator:
Watch this video. Computer Charging Systems - GM - YouTube
JustAnswerhttps://www.justanswer.com > Buick Repair
Apr 9, 2010 - Most likely you issue is the "level" sensor itself. The purpose being when you add weight to the vehicle in the rear, the sensor will tell the ...
1 answer · Top answer: Hello Mr. Dave, Yes, I can see where that would be confusing. I should have...
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there is not one, check engine light is not connected to relay. take car to repair shop and have it fixed. All codes are OBDll and are available on line free.
Anonymous provided their own fix. Good job but you may need to fix it again when Summer comes.
I fixed this problem. I removed the Vent Mode Actuator from under the dash on the drivers side, then I moved the vent shaft by hand. I noticed some of the plastic parts attached to the shaft didn't move when I rotated it, so I just rattled the parts around with my finger. (I think one of the plastic gears inside had jammed and the rattling unjammed it) In any case, the internal louvers are moving with the shaft now, and heat is coming out of the front vents as it should.
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Well all questions need full 'year make model', but if you have nothing at all check the fuse on the positive battery terminal.
But ideally you need an auto electrician with a pro grade scan tool computer. It is better than guessing and can be diagnosed on 30 minutes.
https://www.google.com/search?q=auto+electrician+near+me
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Question edited for clarity.Question moved to model category.Question translated from Spanish to English. We are a North American website, we only speak English.https://translate.google.ca/?sl=auto&tl=en&text=2005%20Buick%20Lacrosse.%20Como%20puedo%20desactivar%20la%20alarma%20de%20un%20auto.&op=translateTo deactivate disconnect the battery.You can't deactivate / Bypass it. The system has two computers and a module stopping you trying what you are trying to do, drive the car without proper credentials. You have to fix it, not find away around it.Resetting the system1-Turn ON the ignition, with the engine OFF. 2-Attempt to start the engine, then release the key to ON (vehicle will not start). 3-Observe the SECURITY telltale(this is the security light), after approximately 10 minutes the telltale will turn OFF. 4-Turn OFF the ignition, and wait 5 seconds .Feb 11, 2018Theft deterrent is on and my 2005 buick lacrosse will not..https://www.youtube.com/watch?v=74AGNqY7Mm8
Did you have it on a scanner or just replaced parts? A scanner can read what the sensors are doing. You may have a bad wire connection that is not allowing the sensors to work.
Go back to basics. What EXACTLY is it doing when you turn the key? Is it dead? Sluggish? Just spinning? Trying but stalling? Starting but won't tick over? All clues to the issue your having.
Are you getting any warning lights? Have you scanned it for OBD Trouble Codes? There's also that silly, obvious one that gets everyone eventually, Is there fuel in the tank? Yup! I've done it!
Recheck EVERYTHING you did. Sometimes it's simple case of you missed a wire or a pipe when you put everything back together. Turn the engine by hand to Top Dead Centre on cylinder 1 and recheck ALL your timing marks. Then check your firing order to make sure the plug wires are ordered correctly.
You dont have to but the tank is lighter when empty and less prone to spillage. You also need to be very careful about sparks and vapor causing an explosion
You mentioned that you welded the BCM was it out of the car and unplugged also make sure that relay you replaced is the correct one make sure plugged in backwards.
Check the air lines coming out of the pump and into each airbag at the wheel end. With the pump running listen to all the joints and air lines you can get to. If it is not rising at all it is most likely an air leak that you will be able to hear. Is there a pressure gauge on the dashboard or on the compressor tank itself? Checking this will show if the pump is actually generating enough pressure to fill the tank to feed the airbags.
