Disconnect/connect battery ground line

AR54.10-S-0003E

Disconnect/connect battery ground line

28.08.2020

Model

447, 448

Modification notes

27.08.2020

Method extended

Step 6

Shown on model 447.8

1

Stowage compartment

B95

Battery sensor

2

Ground cable

G1

On-board electrical system battery

3

Negative terminal clamp screw

 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

General information on vehicles with high-voltage on-board electrical system and/or lithium-ion battery and/or gaseous-fuel drive system as well as personal protective equipment

Model 447 with engine 780

AH00.00-Z-0300-01A

Topical note

Notes on carrying out repair work in the vehicle interior

AH68.00-N-0001-01S

Topical note

Notes on battery

AH54.10-P-0001-01A

Disconnect, connect

1

Disconnect charging cable connector of high-voltage on-board electrical system and wait 30 s until power-down is complete.

Model 447 with engine 780.701
Model 447 with engine 780.702
If high-voltage on-board electrical system is charged via a charging cable connector.

2

Disconnect charger from on-board electrical system battery (G1).

When an external charger is connected.

3

Switch off ignition and store transmitter key outside of transmission range (min. 2  m).

4.1

Unclip stowage compartment (1) on right seat base, starting at top, and remove.

Model 447.8, 448.8

 Long wedge

*115589035900

4.2

Remove side cover from right seat base.

Model 447.6/7, 448.7

5

Detach negative pole clamp screw (3) and remove ground line (2) from on-board electrical system battery (G1).


Do not pull on the ground line (2).
Otherwise, the battery sensor (B95) may be damaged.

 Bolt, ground line to negative terminal for on-board electrical system battery/additional battery

*BA54.10-N-1001-01F



Check

6

Check for absence of voltage on 12 V on-board electrical system.

Model 447
with code ME0 (Electric motor 85 kW)



Service Information: Determine absence of voltage of 12 V on-board electrical system after removing the ground or positive line of the on-board electrical system battery

SI54.10-S-0072A



000 588 07 19 00 Measuring instrument

WS54.00-N-3005B

 The engine hood must be closed. Observe the Service Information.

7

Detach ground line from auxiliary battery.

Model 447.6/7
with code E28 (Additional battery for retrofitted consumers)
Model 447.7/8
with code EE8 (Battery 12V 100 Ah)
Model 447.7/8
with code EE9 (12 V/80 Ah additional battery)
When working on the Supplemental Restraint System (SRS).

AR54.10-S-0004E

8

Disconnect ground line of support battery.

When working on the Supplemental Restraint System (SRS).

Model 447
with code MJ8 (ECO start/stop function)
except code D50 (Full-length partition)
except code D51 (Entire partition with 1 window)
except code S23 (Co-driver's seat double seat)
Model 448

AR54.10-S-0111E

Model 447
with code D50 (Full-length partition)
with code MJ8 (ECO start/stop function)
Model 447
with code D51 (Entire partition with 1 window)
with code MJ8 (ECO start/stop function)
Model 447
with code MJ8 (ECO start/stop function)
with code S23 (Co-driver's seat double seat)

AR54.10-S-0111EE

9

Disconnect ground line of Emergency-P battery.

When working on the Supplemental Restraint System (SRS).

Model 447 with code G42 (7G-TRONIC PLUS) except code MJ8 (ECO start/stop function, model 447 with code G43 (9G-TRONIC) except code MJ8 (ECO start/stop function, model 447 with engine 780.70

AR54.10-S-0120E

10

Connect in reverse order.

11

Set time and date in instrument cluster.

 Battery

Number

Designation

Model 447, 448

BA54.10-N-1001-01F

Bolt, ground line to negative terminal for on-board electrical system battery/additional battery

Nm

5