Maintaining on-board electrical system voltage when performing test and diagnosis work on vehicle

AR54.10-P-1127SY

Maintaining on-board electrical system voltage when performing test and diagnosis work on vehicle

20.01.2020

Model

216.3 as of 6/2/08

Model

216.3 up to 6/1/08

with code 809 (Model year 2009)

Model

221.0/1 as of 6/2/08

Model

221.0/1 up to 6/1/08

with code 809 (Model year 2009)

Shown on model 221

1

Charger positive terminal

2

Charger ground terminal

3

Ground terminal point

4

Charging terminal point

F32/3

Engine compartment prefuse box

G1

On-board electrical system battery

 Danger

Risk of fire/risk of explosion due to short circuit and escaping oxyhydrogen gas. Risk of (burn) injury caused by caustic burns to eyes, skin and mucous membranes from battery electrolyte/mist, short circuit and arcing. Risk of poisoning caused by swallowing battery electrolyte or absorption of lead through the skin or body orifices. Risk of death due to voltage U >= 30 V AC and U >= 60 V DC.

No fires, sparks, open flames, or smoking. Wear acid-resistant gloves, clothing, and glasses. Pour battery acid only into suitable and appropriately marked containers.

AS54.10-Z-0001-01A

Topical note

Notes on battery

AH54.10-P-0001-01A

1

Remove cover of engine compartment prefuse box (F32/3)


When working on a restraint system, when welding and when working on lines without contact protection, the procedure for maintaining the on-board electrical system voltage must not be performed,
as the electrical system or electronic component parts may be damaged.

 For longer test and diagnosis work, a battery charger with medium charging capacity must be connected to maintain the on-board electrical system voltage due to the high current requirement.

2

Connect charger positive terminal (1) to charging terminal point (4) of engine compartment prefuse box (F32/3)

3

Connect charger ground terminal (2) to ground terminal point (3) on wheel well and switch on charger

 Use a charger with at least 30 A charging current and 13.5 V charging voltage, otherwise the on-board electrical system battery could be partially discharged.

4

Switch off and disconnect charger

 After completing the test and diagnosis work on the vehicle.

5

Install cover of engine compartment prefuse box (F32/3)