Remove/install additional battery relay

AR54.15-S-2000E

Remove/install additional battery relay

09.03.2020

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

Modification notes

21.06.2017

Repair method modified.

All operation steps.

09.03.2020

Screw/bolt, seat console to body

BA91.10-N-1003-01J

1

Rear cover

4

Stowage compartment

7

Bolts

2

Seat base

5

Floor covering

8

Wooden block

3

Cover

6

Bolts

G1/12

Backup battery

9

Screw

14

Electrical wiring harness

18

Electric line

10

Ground cable

15

Nut

19

Nut

11

Electric line

16

Screw

20

Battery carrier

12

Electrical connector

17

Bus bar

K120

On-board electrical system backup battery relay

13

Nut

 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 carrying out repair work in the vehicle interior

AH68.00-N-0001-01S

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

 

Remove/install

1

Move head restraint on right front seat all way down

2

Switch off ignition and remove transmitter key

3.1

Remove cover (3) from right seat base (2)

MODEL 447.6/7 , MODEL 448.7

3.2

Unclip and remove stowage compartment (4) at side of right seat base (2), starting at the top

Model 447.8 , model 448.8

 Long wedge

*115589035900

4

Remove screws (7)

 Screw/bolt, seat console to front reinforcement

*BA91.10-N-1004-01J

5

Remove rear cover (1) from right seat base (2)

6

Lift up floor covering (5) in area of bolts (6) and remove bolts (6)

 Screw/bolt, seat console to body

*BA91.10-N-1003-01J

7

Tilt seat base (2) with front seat mounted far enough forward until the backup battery (G1/12) is accessible, and support the seat base (2) using a suitable wooden block (8)

 Installation:
Make sure that no electric lines are jammed between the seat base (2) and body.
Otherwise, the electric lines will be damaged and the electrical system could be damaged.

8

Remove bolt (9) and disconnect ground line (10) together with electric line (11) from negative pole of backup battery (G1/12)

 Bolt, ground line to backup battery negative terminal

*BA54.10-N-1005-01F

9

Take out screw (16) and together with electric line (18), remove from support battery positive pole (G1/12)

 Bolt, busbar to backup battery positive terminal

*BA54.10-N-1004-01F

10

Unscrew nut (15) and remove busbar (17)

 Nut, busbar to relay for backup battery

*BA54.10-N-1003-01F

11

Unscrew nut (13) and detach electrical wiring harness (14) from on-board electrical system support battery relay (K120)

 Nut, wiring harness to backup battery relay

*BA54.18-N-1003-02A

12

Disconnect electrical connection (12)

13

Unscrew nuts (19) and remove on-board electrical system support battery relay (K120) from battery carrier (20)

14

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

 Front seats

Number

Designation

Model 448

Model 447

BA91.10-N-1003-01J

Screw/bolt, seat console to body

Nm

60

60

 Front seats

Number

Designation

Model 448

Model 447

BA91.10-N-1004-01J

Screw/bolt, seat console to front reinforcement

Nm

38

38