Remove/install additional battery relay

AR54.15-S-2000EE

Remove/install additional battery relay

22.11.2019

Model

447

with code D50 (Full-length partition)

Model

447

with code D51 (Entire partition with 1 window)

Model

447

with code MJ8 (ECO start/stop function)

with code S23 (Co-driver's seat double seat)

1

Nuts

5

Screw

9

Electrical connector

2

Cover panel

6

Nut

10

Nut

3

Bus bar

7

Nut

K120

On-board electrical system backup battery relay

4

Ground cable

8

Electrical wiring harness

 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

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

Topical note

Notes on battery

AH54.10-P-0001-01A

Topical note

Notes on carrying out repair work in the vehicle interior

AH68.00-N-0001-01S

 

Remove/install

1

Switch off ignition and remove transmitter key

2

Unscrew nuts (1), loosen Velcro fastener (arrow) and detach cover panel (2) from right seat base


When removing the cover panel (2), make sure that the cover panel (2) does not come into contact with the busbar (3).
Otherwise a short circuit will occur which can damage the electrical system.

3

Disconnect ground line (4) from backup battery

 Bolt, ground line to backup battery negative terminal

*BA54.10-N-1005-01F

4

Remove screw/bolt (5) from backup battery positive terminal

 Bolt, busbar to backup battery positive terminal

*BA54.10-N-1004-01F

5

Unscrew nut (6) and remove busbar (3)

 Nut, busbar to relay for backup battery

*BA54.10-N-1003-01F

6

Unscrew nut (7) and detach electrical wiring harness (8) from on-board electrical system backup battery relay (K120)

 Nut, wiring harness to backup battery relay

*BA54.18-N-1003-02A

7

Disconnect electrical connection (9)

8

Unscrew nuts (10) and remove on-board electrical system support battery relay (K120) from battery carrier

9

Install in the reverse order

 Battery

Number

Designation

Model 447, 448

BA54.10-N-1003-01F

Nut, busbar to relay for backup battery

Nm

9

 Battery

Number

Designation

Model 447, 448

BA54.10-N-1004-01F

Bolt, busbar to backup battery positive terminal

Nm

5

 Battery

Number

Designation

Model 447, 448

BA54.10-N-1005-01F

Bolt, ground line to backup battery negative terminal

Nm

5

 Wiring harness

Number

Designation

Model 447, 448

BA54.18-N-1003-02A

Nut, wiring harness to backup battery relay

Nm

9