Battery Charger: VAS5903 SUPPORT MODE

WARNING: This page is about a different variant/trim than selected.

Special tools and workshop equipment required

Battery Charger: VAS5903

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 : 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! Pay attention to all warnings and safety precautions. Refer to WARNINGS AND SAFETY PRECAUTIONS .

WARNING:

Do not check or charge a Battery -A- when the visual indicator has >>no color or is bright yellow<<. Do not give a jump start.

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

These Batteries -A- must be replaced.

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 terminal clamps correctly according to polarity!
It can result in sparks due to short circuit.
This constitutes an explosion risk.
Make sure the charging clamps are secure.
Do not press the START/STOP button when battery cables are connected incorrectly. 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 battery positive terminal clamp and the body ground. Likewise prevent contact between the battery terminal clamps.

-- 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 approximately five 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).

-- Confirm the selected battery voltage using the START/STOP button.

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

-- Check the charging clamps reconnected to the correct terminals.

-- Confirm charging clamps are connected to correct terminals 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 terminal clamps.

-- Disconnect the : VAS5903 from the power.