Check condition of battery

AR54.10-S-1129E

Check condition of battery

13.02.2020

Model

447, 448

Modification notes

12.02.2020

Change of test method of auxiliary battery for park pawl emergency shift mode.

Step 6

 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



Remove

1

Remove battery to be checked.

Remove on-board electrical system battery

AR54.10-S-0005E

Remove the auxiliary batteryModel 447
with code E28 (Additional battery for retrofitted consumers)
Model 447
with code EE8 (Battery 12V 100 Ah)

AR54.10-S-0007E

Remove additional battery for emergency shift park pawlModel 447 with engine 780.701
except code G42 (7G-TRONIC PLUS)
except code G43 (9G-TRONIC)
except code MJ8 (ECO start/stop function)
Model 447 with engine 780.702
except code G42 (7G-TRONIC PLUS)
except code G43 (9G-TRONIC)
except code MJ8 (ECO start/stop function)
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)

AR54.10-S-0120E

Remove additional battery for ECO start/stop functionModel 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

Remove additional battery for ECO start/stop functionModel 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



Check

2

Check battery for external leakages or damage via visual check.

If a leakage or any damage is detected,



replace battery and dispose of properly and in environmentally-compatible manner.

3

Check on-board electrical system battery using battery test device.

When checking the on-board electrical system battery.

AR54.10-S-1129-01E



000 588 02 19 00 Battery tester

WS54.00-N-3006B

4

Check auxiliary battery using battery test device.

Model 447
with code E28 (Additional battery for retrofitted consumers)
Model 447
with code EE8 (Battery 12V 100 Ah)
When checking the auxiliary battery.

AR54.10-S-1129-01E



000 588 02 19 00 Battery tester

WS54.00-N-3006B

5

Check auxiliary battery for ECO start/stop function using battery test device.

Model 447
with code MJ8 (ECO start/stop function)
When checking the auxiliary battery for ECO start/stop function.

AR54.10-S-1129-01E



000 588 02 19 00 Battery tester

WS54.00-N-3006B

6

Check auxiliary battery for park pawl emergency shift mode.

When checking the auxiliary battery for park pawl emergency shift mode.



Service Information: Testing method for additional battery for park pawl emergency shift mode

Model 447 with engine 780
except code G42 (7G-TRONIC PLUS)
except code G43 (9G-TRONIC)
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)

SI54.10-S-0050A

7

Reduce increased voltage of on-board electrical system battery after charging process.

When checking the on-board electrical system battery, if the message "Surface voltage detected" is shown on the battery test device display.

AR54.10-S-1129-03E



000 588 03 19 00 Load tester

WS15.00-P-0027B

8

Reduce increased voltage of auxiliary battery after charging process.

Model 447
with code E28 (Additional battery for retrofitted consumers)
Model 447
with code EE8 (Battery 12V 100 Ah)
When checking the auxiliary battery, if the message "Surface voltage detected" is shown on the battery test device display.

AR54.10-S-1129-03E



000 588 03 19 00 Load tester

WS15.00-P-0027B

9

Reduce increased voltage of auxiliary battery for ECO start/stop function after charging process.

Model 447
with code MJ8 (ECO start/stop function)
When checking the auxiliary battery for ECO start/stop function, if the "Surface voltage detected" message is shown on the battery test device display.

AR54.10-S-1129-03E



000 588 03 19 00 Load tester

WS15.00-P-0027B

10

Check on-board electrical system battery again using battery test device.

When checking the on-board electrical system battery, if an increased voltage was reduced after the charging process.

AR54.10-S-1129-01E



000 588 02 19 00 Battery tester

WS54.00-N-3006B

11

Check auxiliary battery again using battery test device.

Model 447
with code E28 (Additional battery for retrofitted consumers)
Model 447
with code EE8 (Battery 12V 100 Ah)
When checking the auxiliary battery if an increased voltage was reduced after the charging process.

AR54.10-S-1129-01E



000 588 02 19 00 Battery tester

WS54.00-N-3006B

12

Check auxiliary battery for ECO start/stop function again using battery test device.

Model 447
with code MJ8 (ECO start/stop function)
When checking the auxiliary battery for ECO start/stop function, if an increased voltage was reduced after the charging process.

AR54.10-S-1129-01E



000 588 02 19 00 Battery tester

WS54.00-N-3006B

13

Charge on-board electrical system battery.

When checking the on-board electrical system battery, if the "Charge and check" message is shown on the battery test device display.

AR54.10-S-1130E

14

Charge auxiliary battery.

Model 447
with code E28 (Additional battery for retrofitted consumers)
Model 447
with code EE8 (Battery 12V 100 Ah)
After checking the auxiliary battery, if the message "Charge and check" is shown on the battery test device display.

AR54.10-S-1130E

15

Charge auxiliary battery for ECO start/stop function.

Model 447
with code MJ8 (ECO start/stop function)
After checking the auxiliary battery for ECO start/stop function, if the message "Charge and check" is shown on the battery test device display.

AR54.10-S-1130E

16

Fill out test sheet.



Test sheet for on-board electrical system batteries, starter batteries and support batteries, form

OF54.10-P-3000-02B



Install

17

Install battery.

Install on-board electrical system battery

AR54.10-S-0005E

Install additional batteryModel 447
with code E28 (Additional battery for retrofitted consumers)
Model 447
with code EE8 (Battery 12V 100 Ah)

AR54.10-S-0007E

Install additional battery for emergency shift park pawlModel 447 with engine 780.701
except code G42 (7G-TRONIC PLUS)
except code G43 (9G-TRONIC)
except code MJ8 (ECO start/stop function)
Model 447 with engine 780.702
except code G42 (7G-TRONIC PLUS)
except code G43 (9G-TRONIC)
except code MJ8 (ECO start/stop function)
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)

AR54.10-S-0120E

Install additional battery for ECO start/stop functionModel 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

Install additional battery for ECO start/stop functionModel 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

 The batteries must never be mixed up.