Audi A4 Owners & Service Manuals

Audi A4: Battery Charger -VAS5903- Support Mode

General Information

The support mode provides the vehicle electrical system with voltage when the Battery -A- is removed or disconnected.

For more information. Refer to the Battery Charger -VAS5903- Operating Instructions.

The support mode is used for the following situations:

  • Vehicle electrical system support mode with the Battery -A- not installed
  • Maintaining the voltage when the battery is being replaced
  • Systems test without the Battery -A-

  WARNING

Risk of injury. Follow all warning messages and safety precautions. Refer to → Chapter "Warnings and Safety Precautions".

  WARNING

Do not check or charge a Battery -A- when the visual indicator has "no color or is bright yellow". Jump starting must not be used!

There is a risk of explosion during testing, charging or jump starting.

These Batteries -A- must be replaced.

Special tools and workshop equipment required

  • Battery Charger -VAS5903-

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 Battery Charger -VAS5903- can become damaged.

- Remove the Battery -A-. Refer to → Electrical Equipment; Rep. Gr.27; Battery; Battery, Removing and Installing.

- Connect the Battery Charger -VAS5903- to the power supply. The last selected operation mode is shown on the display. Refer to → Chapter "Battery Charger -VAS5903- Device Description".

  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 Battery Charger -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 Battery Charger -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 Battery Charger -VAS5903- from the power.

Battery Charger -VAS5903- Maintenance Charging

  Note

  • If the Battery -A- is discharged by an electrical consumer during maintenance charging, the Battery Charger -VAS5903- automatically supplies an appropriate charge.
  • Maintenance charging can be performed without time restrictions.
  • The Battery -A- can be used constantly.
  • Observe the maintenance notes of the battery manufacturer.

  WARNING

Risk of injury. Follow all warning messages and safety precautions. Refer to → Chapter "Warnings and Safety Precautions".

  WARNING

Do not check or charge a Battery -A- when the visual indicator has "no color or is bright yellow". Jump starting must not be used!

There is a risk of explosion during testing, charging or jump starting.

These Batteries -A- must be replaced.

Special tools and workshop equipment required

  • Battery Charger -VAS5903-

If the Battery -A- is fully charged, the Battery Charger -VAS5903- starts maintenance charging.

Procedure

- Proceed as if charging the Battery -A-. Refer to → Chapter "Battery, Charging with Battery Charger -VAS5903-".

With a charge status of 100%, all bars are indicated on the display -1-.

N27-10180

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