Remove/install DC/DC converter

AR47.70-S-1500F

Remove/install DC/DC converter

28.02.2020

Engine

780.701 in model 447

Shown on removed charger

1

DC/DC converter

2

Mounting clip

3

Mounting clip

4

High-voltage plug

1

DC/DC converter

7

Nut

10

Coolant hose

4

High-voltage plug

8

Positive line

11

Coolant hose

5

Screw

9

Electrical connector

12

Nuts

6

Equipotential bonding line

 Caution

Risk of injury caused by scraping or cutting body parts on sharp vehicle parts

Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.

AS00.00-Z-0017-01A

 Danger

Risk of death when working on component parts and systems with U >= 30 V alternating voltage (AC) or U >= 60 V direct voltage (DC)

Do not touch damaged or defective live component parts and lines or non-insulated electrical connections and lines.

AS00.00-Z-0035-01A

 Warning

Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant.

Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers.
Wear protective gloves, protective clothing and safety glasses.

AS20.00-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

AH00.00-Z-0300-01A

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

 

Remove/install

1

Remove voltage of high-voltage on-board electrical system.

AR47.70-S-1000F

2

Disconnect ground line from battery.

AR54.10-S-0003E

3

Remove charger for high-voltage battery.

AR47.70-S-1510F

4

Remove screw (5), remove equipotential bonding line (6), and place to one side.

Check ground lines for high-voltage on-board electrical system potential equalization

AR47.70-S-1020-01F

 Installation: Check equipotential bonding line (6) for the DC/DC converter (1).

 Nut, potential equalization ground line to body

*BA47.70-N-1013-02F

 Screw, potential equalization ground line to DC/DC converter

*BA47.70-N-1005-02F

5

Unscrew nut (7), remove positive line (8), and place to one side.

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

 Nut, positive line to DC/DC converter

*BA47.70-N-1012-01F

6

Detach electrical connection (9).

7

Unclip retaining clips (2, 3) of the high voltage line.

 Clip remover

*452589016300

8

Release high-voltage plug (4) and disconnect from the DC/DC converter (1).

9

Cover electrical connections with suitable protective covers.

 Set of protective covers

*001589019100

10

Mark coolant hoses (10, 11) from the DC/DC converter (1).

11

Remove coolant hose (10) and seal openings with suitable protective covers.

AR20.20-P-7441-01RQ

 Collect escaping coolant.

 Installation: Note marking.

 Set of protective covers

*001589019100

12

Remove coolant hose (11) and seal openings with suitable protective covers.

AR20.20-P-7441-01RQ

 Collect escaping coolant.

 Installation: Note marking.

 Set of protective covers

*001589019100

13

Unscrew nuts (12).

 WIS Service Media
wsm://04_ 201800_27
Operation steps 13 and 14 are shown.

 Nut, DC/DC converter to holder

*BA47.70-N-1008-01F

14

Remove DC/DC converter (1).

15

Install in the reverse order

16

Perform commissioning of the DC/DC converter (1) with the vehicle diagnosis system.

If a new DC/DC converter (1) is installed.



AD00.00-S-2000-04E

 High-voltage on-board electrical system potential equalization ground lines

Number

Designation

Engine 780.701 in model 447

BA47.70-N-1005-02F

Screw, potential equalization ground line to DC/DC converter

Nm

16

 High-voltage battery, high-voltage battery module, DC/DC converter, charger

Number

Designation

Engine 780.701 in model 447

BA47.70-N-1008-01F

Nut, DC/DC converter to holder

Nm

23

 High-voltage battery, high-voltage battery module, DC/DC converter, charger

Number

Designation

Engine 780.701 in model 447

BA47.70-N-1012-01F

Nut, positive line to DC/DC converter

Nm

20

 High-voltage on-board electrical system potential equalization ground lines

Number

Designation

Engine 780.701 in model 447

BA47.70-N-1013-02F

Nut, potential equalization ground line to body

Nm

16