TSB : CHARGING A SEVERELY DISCHARGED BATTERY USING Battery Charger: VAS5903

Details

Special tools and workshop equipment required Battery Charger : VAS5903 Fig 1: Battery Charger VAS5903 Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC. NOTE: If software updates or flash campaigns/actions are performed on a vehicle, a charger with at least 70 A charging current must be used in order to avoid problems during software updates and flash campaigns/actions. Battery Charger "VAS5903". Refer to Battery Charger . Battery Charger "VAS5908". Refer to Battery Charger . WARNING: Risk of injury! Follow all Warnings and Safety Precautions. Refer to WARNINGS AND SAFETY PRECAUTIONS . WARNING: Batteries that have a light yellow visual indicator do not have to be tested or charged. Do not give a jump start. There is a risk of explosion during testing, charging or jump starting. These batteries must be replaced. CAUTION: The polarity protection of the charger clamps is not active in the operation mode "charging severely discharged batteries/Support mode". Connect the charger clamps to the battery terminal clamps correctly according to polarity! During the charging process, always set the operation mode corresponding with the battery. Refer to the Battery Charger VAS5903 Operating Instructions! The severely discharged battery is not recognized by the charger Refer to SEVERELY DISCHARGED BATTERIES . Do not press the START / STOP button when battery cables are connected incorrectly. The charger could get damaged. It is not possible for the Battery Charger : VAS5903 to automatically detect batteries with a voltage under 2 Volts. NOTE: Observe the notes in SEVERELY DISCHARGED BATTERIES . Severely discharged batteries in vehicles must be replaced prior to delivery. Pre-existing damage cannot be ruled out. The battery temperature must be at least 10 °C (50 °F). -- Turn off the ignition and all electrical equipment. -- Plug in the power connector of the charger. The last selected mode is shown on the display. Refer to Battery Charger . -- Select applicable battery type using INFO . Fig 2: Identifying Battery Type Symbols Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC. The symbol -1- for "service charge of wet batteries" or the symbol -2- for "service charge of Gel/AGM batteries" is indicated in the display. -- Set the capacity (Ah) of the battery to be charged with the corresponding button "Up" ↑ or "Down" ↓ . -- Clamp the red charging clamp "+" to the positive battery terminal. NOTE: For vehicles with a start/stop function and an installed Battery Monitoring Control Module : J367 , the black charging clamp - must be connected to the body ground. The start/stop system will malfunction if it is connected to the negative terminal on the battery. -- Connect the black charging clamp "-" to the negative battery terminal. -- Press START / STOP for approximately 5 seconds. The menu selection "charging severely discharged batteries/Support mode" is activated. -- Press the corresponding button "Up" ↑ or "Down" ↓ , to set the respective battery voltage (6 V, 12 V or 24 V). NOTE: If no button is touched within five seconds, the battery charger will return to the main menu (operating mode selection). -- Confirm the selected battery voltage by pressing the START / STOP button. Then the inquiry about the correct polarity of the charging clamps is made. -- Verify that the charger clamps are connected to the correct polarity. -- Confirm that the charger clamps are connected to the correct terminals by pressing START / STOP . The charger begins charging the severely discharged battery. End Battery Charging Process: -- Press START / STOP . -- Remove the black charging clamp "-" of the charger from the negative battery terminal. -- Remove the red charging clamp "+" of the charger from the positive battery terminal. -- Pull out the power connector of the charger.