Battery A, Disconnecting And Connecting, Vehicles Without 48V System, (VH0)

Special tools and workshop equipment required 

• Analog/Digital Multimeter :FLU83III 

The Auxiliary Battery - A1- is switched in parallel to the Battery - A-. The vehicle electrical system will only be de-energized if the auxiliary battery was de-energized first.

Disconnecting

-- Slide the service cover -1- toward the rear -arrows- and remove it.

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-- Disconnect the connector -arrow-.

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Tip

The auxiliary battery is de-energized by disconnecting the connector -arrow-.

-- Open the cover in the right luggage compartment side trim panel.

-- Loosen the nut -2- and remove the Battery Monitoring Control Module -J367- -1-.

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Check that it is de-energized on the jump-start connection point using the analog/digital multimeter.

-- Release the retainer -1-.

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-- Open the covers -2-.

-- Measure using the Analog/Digital Multimeter :FLU83III  between the positive terminal -3- and the negative terminal -4-.

Conditions

• Display on analog/digital multimeter = 0 Volt.

Connecting

-- Disconnect the connector -2-.

Fig 1: Connecting Battery

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-- Connect the control module -3- to the battery negative terminal "-".

-- Tighten the nut -1-.

-- Connect the connector -2-.

-- Connect the connector -arrow-.

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If the battery was reconnected, the following steps must be performed:

• Activate the power window regulator one-touch up/down function. Refer to the Owner's Manual.
• Check DTC memories of all control modules and delete the displayed entry "Undervoltage" using the Vehicle Diagnostic Tester .

Tip

After reconnecting the power supply, the ESP warning lamp can only go out after the vehicle has been driven a few meters.

Tightening Specifications

• Refer to OVERVIEW - BATTERY A, VEHICLES WITH ALTERNATIVE DRIVE SYSTEM, (0K4)  .