VW Golf manuals

Volkswagen Golf Service & Repair Manual: Charging battery in service mode with battery charger -VAS 5900-

  WARNING
Danger of injury! Observe warning notices and safety regulations → Chapter!
  Caution
The operating mode “service charge” is not permitted on VW vehicles as the voltage peaks will damage the onboard electronics.
If there is a requirement to use “service charge” the battery must be disconnected from the onboard supply.
  WARNING
It is not permissible to test or charge batteries whose magic eye shows light yellow. Do not slave/jump start the vehicle!
Danger of explosion when checking and charging or slave/jump starting.
These batteries must be renewed.
  Caution
When charging always set the battery charger to the correct type of battery → operating instructions for battery chargerVAS 5900!
The “service mode” is suitable for:
Wet batteries where the magic eye allows charging (magic eye black or green)
The operating mode “service charge (SERV)” is only used on sulphated batteries. The battery is charged at a voltage of > 14.4 V. This can result in a partial reduction of the sulphated layer. After charging, always check the colour of the magic eye before using the battery → Chapter.
Special tools and workshop equipment required
   
Battery charger -VAS 5900-
  Note
The battery must have a temperature of at least 10°C.
–  Switch off ignition and all electrical consumers.
–  Connect charger plug to battery charger. The last selected operating mode will appear on display → Chapter.
 

Charging battery in service mode with battery charger -VAS 5900-

–  Set battery to respective battery type with INFO.
In the display, the symbol -1- for “Service charge for wet batteries” or symbol -2- for “Service charge for gel/absorbent glass mat batteries” will appear.
–  Set battery capacity (Ah) of battery for charging using respective button “Up”↑ or “Down”↓.
–  Connect red terminal clamp “+” to positive terminal on battery.
  Note
In vehicles with start/stop function and battery monitor control unit -J367- fitted, black terminal clamp “-” must be connected to body earth. Connecting it to battery negative terminal will cause start/stop system to malfunction.
–  Connect black terminal clamp “-” to negative terminal.
The charger unit recognises the voltage required for the connected battery (6 V, 12 V or 24 V) and initiates the charging sequence.
 

Charging battery in service mode with battery charger -VAS 5900-

At a charge condition of approx. 80 - 85% of the battery voltage, the battery charger switches to the “final charge” mode. The fourth bar appears in display -1-. The battery is ready for use.
  Note
The success of the “service charge” depends on the severity of the sulphation of the battery
Possible faults and fault rectification:
1 -  Displayed battery voltage is not as per nominal voltage:
–  Press respective button “Up”↑ or “Down”↓ until charging sequence starts.
2 -  Displayed battery voltage is not as per nominal voltage – charging sequence already started:
–  Press START / STOP twice.
–  Press respective button “Up”↑ or “Down”↓ until charging sequence starts.
3 -  Battery charger does not detect a battery, when battery voltage is less than 2 V:
Display remains unchanged.
The operating mode and ampere hours (Ah) as set are displayed.
Ending battery charging sequence:
–  Press START / STOP.
–  Disconnect black terminal clamp “-” of charger from negative terminal.
–  Disconnect red terminal clamp “+” of charger from positive terminal on battery.
–  Pull charger plug out of battery charger.
 

Charging battery in service mode with battery charger -VAS 5900-

Charging battery with battery charger -VAS 5900-
  WARNING Danger of injury! Observe warning notices and safety regulations → Chapter! ...

Charging totally discharged batteries with battery charger -VAS 5900-
  WARNING Danger of injury! Observe warning notices and safety regulations → Chapter! ...

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