Battery indicator come out
- Thread starter klise0501
- Start date
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klise0501;752429 said:
NORMALLY, the light will come "ON" when the RPM is low.. (If your alternator is the problem)
You seem to have the reverse effect.
mmmm.... Another interesting and unusual problem faced by you..
astroboy
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Your battery light is coming on at high rpm due the alternator regulator brushes bouncing. Causes for the brush bounce is:
A) worn brushes due to mileage or worn due to contamination (ie spilled oil, transmission, or brake fluid into alternator)
B) High engine vibration: rear alternator mounting bracket loose or engine mount problem.
C) Loose belt, high rpm causes the belt to slip.
The battery light will come on more often as the brushes get shorter.
A) worn brushes due to mileage or worn due to contamination (ie spilled oil, transmission, or brake fluid into alternator)
B) High engine vibration: rear alternator mounting bracket loose or engine mount problem.
C) Loose belt, high rpm causes the belt to slip.
The battery light will come on more often as the brushes get shorter.
From BMW WDS.
BSD interface to the alternator
The alternator with BSD interface can actively communicate with the engine control unit. The alternator is not linked to the charge indicator lamp, only to the engine control unit. The alternator can detect a variety of faults.
Function
The following functions have been implemented in the engine control unit for the alternator with BSD interface:
-Activating/deactivating the alternator on the basis of appliable parameters
-Specification of the maximum permitted degree of utilisation of the alternator
-Control of the alternator's load response
-Calculation of the alternator moment degree of utilisation
-Diagnosis of the data line between the alternator and the engine control
-Filing of alternator faults in the defect code memory
Activating the load control lamp in instrument cluster via CAN
In comparison to alternators used so far, the display strategy of the load control lamp does not change when the alternator with BSD interface.
The basic function of the alternator is also ensured if the communication between the alternator and the engine control is interrupted.
Possible faults
The following possible faults can be distinguished from fault entries:
High temperature control: The alternator is overloaded; to be safe, the alternator voltage is reduced until the alternator has cooled down again. The charge indicator lamp does not light up.
-Mechanical fault: The alternator is mechanically blocked or the belt drive has failed.
-Electrical fault: Exciter diode defect, excite interruption, overvoltage due to controller defect.
-Communication failure: Line defect between the engine control and alternator.
The following cannot be detected: Coil interruption or short-circuit
Battery charge indicator lamp
The signal for the charge indicator lamp to light up is transferred across CAN to the instrument cluster. The charge indicator lamp lights up if there is mechanical and electrical fault (see above).
Detection
The above-mentioned calculation of the alternator moment and the rate of utilisation of the alternator are heavily dependent on the type (performance) and manufacturer.
This is why the alternator provides the engine control with this data. The engine control adapts its calculation and set values to the exact type.
Aim
The precise calculation of the alternator moment and control of the load response function enables good idling of the engine.
Control of the alternator voltage based on nominal values from the engine control enables a good charge balance of the battery.
Look like your alternator maybe giving too much Voltage Output.
You can use the OBD Special Function to check the voltage output if you do not a voltmeter.
BSD interface to the alternator
The alternator with BSD interface can actively communicate with the engine control unit. The alternator is not linked to the charge indicator lamp, only to the engine control unit. The alternator can detect a variety of faults.
Function
The following functions have been implemented in the engine control unit for the alternator with BSD interface:
-Activating/deactivating the alternator on the basis of appliable parameters
-Specification of the maximum permitted degree of utilisation of the alternator
-Control of the alternator's load response
-Calculation of the alternator moment degree of utilisation
-Diagnosis of the data line between the alternator and the engine control
-Filing of alternator faults in the defect code memory
Activating the load control lamp in instrument cluster via CAN
In comparison to alternators used so far, the display strategy of the load control lamp does not change when the alternator with BSD interface.
The basic function of the alternator is also ensured if the communication between the alternator and the engine control is interrupted.
Possible faults
The following possible faults can be distinguished from fault entries:
High temperature control: The alternator is overloaded; to be safe, the alternator voltage is reduced until the alternator has cooled down again. The charge indicator lamp does not light up.
-Mechanical fault: The alternator is mechanically blocked or the belt drive has failed.
-Electrical fault: Exciter diode defect, excite interruption, overvoltage due to controller defect.
-Communication failure: Line defect between the engine control and alternator.
The following cannot be detected: Coil interruption or short-circuit
Battery charge indicator lamp
The signal for the charge indicator lamp to light up is transferred across CAN to the instrument cluster. The charge indicator lamp lights up if there is mechanical and electrical fault (see above).
Detection
The above-mentioned calculation of the alternator moment and the rate of utilisation of the alternator are heavily dependent on the type (performance) and manufacturer.
This is why the alternator provides the engine control with this data. The engine control adapts its calculation and set values to the exact type.
Aim
The precise calculation of the alternator moment and control of the load response function enables good idling of the engine.
Control of the alternator voltage based on nominal values from the engine control enables a good charge balance of the battery.
Look like your alternator maybe giving too much Voltage Output.
You can use the OBD Special Function to check the voltage output if you do not a voltmeter.
xcrave
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Then based on the above, I conclude my problem is caused by the alternator charge/voltage/amp sent to the Battery + Current usage VS Battery Charging requirement are not tally. Thus the Car thinks that the alternator is faulty because of the low output vs usage sent to the battery/Car 
I've tried switching to the standard battery and in just a few minutes the battery warning sign is gone. But then my Sound system sucks too...
I still think its his Alternator -Voltage Regulator (copper brush and regulation system) that is faulty instead... cause it make sense when you speed up, the alternator will speed up too; sending fluctuation faster thus the warning sign is imminent when on high RPM.
Check this part first (it cost the least)
The parts can be obtained from online shops such as ebay/pelican parts
Good luck bro
BTW Refurbished alternator are basically change of regulator, brushes and cleaning the alternator it self... so why not DIY and save.
I've tried switching to the standard battery and in just a few minutes the battery warning sign is gone. But then my Sound system sucks too...
I still think its his Alternator -Voltage Regulator (copper brush and regulation system) that is faulty instead... cause it make sense when you speed up, the alternator will speed up too; sending fluctuation faster thus the warning sign is imminent when on high RPM.
Check this part first (it cost the least)
The parts can be obtained from online shops such as ebay/pelican parts
Good luck bro
BTW Refurbished alternator are basically change of regulator, brushes and cleaning the alternator it self... so why not DIY and save.
