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When i turn on my computor i get this message: your system battery voltage is low. Does this mean i need a new battery.

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Mcdevito75 here, It may, try to re-charge battery--ies.

Posted on Jul 14, 2010

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My battery and brake waring light came on so i put a new battery in but the lights wont go out .how do you clear them.i have a 2007 nissan murano


The battery light doesn't mean you need a new battery it means that the battery charging system is faulty, that is the alternator and the voltage regulator, the lights are on because the system voltage is low, they will not turn off until the charging system problem is diagnosed and repaired.

Jul 06, 2017 | 2007 Nissan Murano SE

1 Answer

Our 2007 Ford Freestyle 3.0V6 shows B1318 code, also scanner shows low battery voltage module. Car shuts off.Please help what to do to fix?


Which module ?

B1318 Battery Voltage Low Audio Control Module REFER to Section 414-00 . B1318 Battery Voltage Low DSM REFER to Section 414-00 . B1318 Battery Voltage Low DVD Player REFER to Section 414-00 . B1318 Battery Voltage Low Instrument Cluster REFER to Section 414-00 . B1318 Battery Voltage Low RCM REFER to Section 414-00 . B1318 Battery Voltage Low Satellite Radio Receiver REFER to Section 414-00 . B1318 Battery Voltage Low SJB REFER to Section 414-00 .
According to this charging system isn't working correctly ! This is a computer controlled charging system .
Principles of Operation
The powertrain control module (PCM) controlled charging system determines the optimal voltage setpoint for the charging system and communicates this information to the voltage regulator. This system is unique in that it has 2 unidirectional communication lines between the PCM and the generator/regulator. Both of these communication lines are pulse-width modulated (PWM). The generator communication (GEN COM) line communicates the desired setpoint from the PCM to the voltage regulator. The generator monitor (GEN MON) line communicates the generator load and error conditions to the PCM. The third pin on the voltage regulator, the A circuit pin, is a dedicated battery voltage sense line.
The charging system voltage is controlled by the PCM. The generator charges the battery and at the same time supplies power for all of the electrical loads that are required. The battery is more effectively charged with a higher voltage when the battery is cold and a lower voltage when the battery is warm. The PCM is able to adjust the charging voltage according to the battery temperature by using a signal from the intake air temperature (IAT) sensor. This means the voltage setpoint is calculated by the PCM and communicated to the regulator by a communication link.
The PCM simultaneously controls and monitors the output of the generator. When the current consumption is high or the battery is discharged (the PCM recognizes this and increases the output of the generator to accommodate), the system is also able to increase the idle speed to increase the charge.
To minimize the engine drag when starting the engine, the PCM does not allow the generator to produce any output until the engine has started. The PCM then progressively increases the output of the generator.
The PCM turns the charging system warning indicator off after the engine is started and illuminates it under fault conditions (when the generator is not generating the correct amount of current with the engine running). The charging system warning indicator is also illuminated by the PCM whenever the key is ON with the engine OFF.
This is a System 4 charging system, which uses the GEN MON and GEN COM lines to control and monitor the charging system through the PCM. System 4 charging systems are virtually identical in design and therefore, share the same diagnostics. The circuit numbers and colors may be different, but the functions are the same.

Jun 30, 2017 | Ford Cars & Trucks

1 Answer

My battery light came on while i was driving than a few minutes later everything shut off. The battery was replaced in january and alternator was replaced in october.. what could be the problem?


For the alternator to work B+ voltage must be applied to the heavier gage wire on the back of the alternator ,plus the alternator is computer controlled , by the PCM !
Charging System Indicators
BATTERY The IPC illuminates the battery indicator when the following occurs:
?€¢
The PCM detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the PCM requesting illumination.


?€¢
The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the body control module (BCM) indicating the system voltage.


?€¢
The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.


?€¢
The ignition is on, with the engine off.
BATTERY NOT CHARGING The IPC illuminates the battery not charging indicator in the driver information center when the following occurs:
?€¢
The PCM detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the PCM requesting illumination.


?€¢
The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the body control module (BCM) indicating the system voltage.


Your best is to have a qualified repair shop check it out ! Could have DTC'S - diagnostic trouble codes stored !
DTC P0562
The powertrain control module (PCM) continuously monitors that the system voltage stays within the proper range. If the PCM detects an excessively high system voltage, DTC P0563 will set. A high voltage condition may cause a stalling condition or other drive ability concerns.
DTC P0621
The powertrain control module (PCM) uses the generator turn on signal circuit to control the generator. A high side driver within the PCM allows the PCM to turn the generator ON and OFF. When Generator operation is desired, the PCM sends a 5 volt signal to the voltage regulator via the generator turn on signal circuit. This causes the voltage regulator to begin controlling the generator field circuit. Once the Generator is enabled by the PCM, the voltage regulator controls generator output independently of the PCM. Under certain operating conditions, the PCM can turn Off the generator by turning Off the 5 volt signal on the generator turn on signal circuit. The PCM has fault detection circuitry which monitors the state of the generator turn on signal circuit. If the fault detection circuit senses a voltage other than what is expected, this DTC will set. The voltage regulator also contains fault detection circuitry. If the regulator detects a problem, the regulator will ground the generator turn on signal circuit, pulling the voltage low. This also causes the PCM to set the DTC.
DTC P0622
Checking for codes an voltage drop testing the connections an using a scan tool to check data parameters is the only way to solve your problem . Which means taking to a qualified repair shop !

Jul 26, 2016 | 2002 GMC Envoy

1 Answer

My 2008 Dodge Dakota is sending the code P0562. How do I fix this problem ??


Possible causes-- Low battery charge
- Battery defective
- Loose or missing alternator drive belt
- Faulty alternator
- Open or short system voltage circuit

Start by checking battery voltage.

Sep 20, 2014 | 2008 Dodge Dakota

1 Answer

Pw9120-700i dc bus fault ,low o/p v messages


If your batteries are ok a DC BUS fault and low o/p voltage means one of the componants inside is defective. An end user can not effect repair. You need to have it looked at.

Jul 14, 2014 | Powerware 9120 UPS System

1 Answer

Wont start or turn over but makes a clicking sound at the shifter


when you hear a clicking sound it means your battery voltage is too low The battery posts and clamps need to be cleaned and put back together. Did you leave lights on or something to kill the battery? Or is the battery not charging? You may need a new battery and a new voltage regulator. Is the belt tight? Is the alternator producing a voltage or is it time to get it serviced or replaced? These are rhetorical questions of course.

Oct 15, 2013 | 2007 Dodge Caliber SXT Sport Hatchback

1 Answer

My dell demension E521 is giving me a "alert system battery low" message. Any suggestions?


Check the batteries voltage and check to see if the battery is being supplied charge voltage when the computer is off. If both these are good then your low battery message is in error. No charge voltage would mean faulty charger and low battery voltage would mean faulty battery.

Dec 15, 2012 | Dell Dimension E521 PC Desktop

1 Answer

I have a Simon XT which I installed about two weeks ago. I keep getting a system low battery message when I press the status button on the console. I had a new battery shipped and I installed it about 24...


Call your Central Station and put your account on test if it is a monitored system.

Power down the system. Disconnect the battery, then the AC adapter. Then plug the battery in first, then the AC adapter. Plugging the AC adapter in first can cause the low battery message.

if that doesn't work, with the battery disconnected, measure the voltage of the battery with a multimeter. If it reads less than 5.4 volts, the battery is bad. Bad out of the box batteries are not too uncommon.

Next, check the charging voltage from the panel. Measure DC voltage from the leads that connect to the battery. They should read around 6 Volts DC. If the charging circuit is bad, it will cause a low battery trouble and the console will need to be repaired or replaced.

Hope this helps.

Feb 19, 2011 | GE Security Simon 3 Wireless Home Security...

1 Answer

Have a Dell XPS 600 problem. I am getting a message when I turn on the computer, "Keyboard Failure Alert! System battery voltage is low. Strike the F1 key to continue, F2 to run setup utility." What should...


If you have another keyboard try swapping it out and see if it reads the new one. Also a stuck key could possibly cause this error. System battery message probably means you need a new battery for the motherboard. If you replace the battery get the new one before removing the old one. If you leave it out too long you can clear the CMOS

Oct 14, 2010 | Dell XPS 600 PC Desktop

3 Answers

Dell Dimension 8300


Here's Dell's page for changing the battery for a Dimension 8300:
http://support.dell.com/support/edocs/systems/dim8300/sm/battery.htm

Nov 01, 2007 | Dell Dimension 4600 PC Desktop

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