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Home >> Audi >> 2021 >> A4 Quattro Premium Plus, 2.0L Eng VIN B >> Repair and Diagnosis >> Engine Mechanical >> Starter >> Charging System (Battery, Starter And Generator) & Cruise Control (2 Of 2) >> 27 Starter, Generator And Cruise Control >> Battery, Charging >> Battery Charger :VAS5903 >> Battery Charger :VAS5903 SUPPORT MODE >> Procedure

Battery Charger :VAS5903 SUPPORT MODE: Procedure

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 terminals correctly according to polarity!
  • It can result in sparks due to short circuit.
  • This constitutes an explosion risk.
  • Make sure the charging clamp connections are secure.
  • Do not touch START / STOP  button when battery cables are incorrectly connected! The :VAS5903  can become damaged.

-- Remove the Battery -A-. Refer to BATTERY, REMOVING AND INSTALLING .

-- Connect the :VAS5903  to the power supply. The last selected operation mode is shown on the display. Refer to Battery Charger .

CAUTION:

Whenever the Battery -A- is removed, be careful to prevent contact between the connected charge clamp on the positive terminal and the body ground. Likewise prevent contact between the battery terminals.

-- Connect the red charge terminal (+) to the positive terminal of the Battery -A-.

NOTE:

On vehicles with a Start/Stop function and an installed Battery Monitoring Control Module -J367-, the black charge terminal (-) must be connected to the body ground. The Start/Stop system will malfunction when it is connected to the Battery -A- negative terminal.

-- Connect the black charge terminal (-) to the negative terminal of the Battery -A- /negative connector.

-- Press the START/STOP  button for about 5 seconds. The menu selection "Charging severely discharged batteries/Support mode" is activated.

-- Press the corresponding ↑  -button or ↓  button to adjust the battery voltage (6 V/12 V/24 V).

NOTE:

If no button is touched within five seconds, the :VAS5903  will return to the main menu (operating mode selection).

-- Select the battery voltage by pressing the START/STOP  button.

Then the inquiry about the correct polarity of the charging clamps is made.

-- Check correct polarity connection of charger clamps.

-- Confirm charging clamps are connected to correct poles via START/STOP  button.

The :VAS5903  starts the Battery -A- support mode.

End the Battery Support Mode

-- Press the START/STOP  -button.

-- Remove the charging clamps from the battery terminals.

-- Disconnect the :VAS5903  from the power.

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