Remove/install high-voltage battery circuit heater

AR20.00-P-0002SRE

Remove/install high-voltage battery circuit heater

02.12.2019

Engine

780.997 in model 453.091/391/491

1

Electrical connector

2

Coolant hose

3

Coolant hose

4

High-voltage battery heater

5

Bracket

6

Supporting frame

 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 handling vehicles with high-voltage on-board electrical system and/or lithium-ion battery and/or gaseous-fuel drive system

AH00.00-Z-0300-01A

Topical note

Notes on coolant

AH20.00-N-2080-01A

Topical note

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

 

Remove/install

1

Remove transmitter key.

2

Detach charging cable from high-voltage on-board electrical system on both sides.

If the charging cable is connected.

3

Disconnect diagnostic system.

If diagnostic system is connected.



AD00.00-P-2000-06SR

4

Lift vehicle with lifting platform.

 Align the turn plates so that the screws of the rubber pads on the turn plates cannot come into contact with vehicle parts while jacking up.

5

Remove front underfloor paneling.

6

Disconnect electrical connector (1).

7

Clamp off coolant hoses (2, 3) from high-voltage battery heater (4).

 Clamp

*000589543700

8

Remove coolant hoses (2, 3) from high-voltage battery heater (4) and catch escaping coolant in a suitable container.

 Hose clamp pliers

*003589033700

9

Close off coolant connections on the high-voltage battery heater (4) with suitable stop plugs.

 Record plug

*129589009100

10

Remove high-voltage battery heater (4) with the bracket (5) from the supporting frame (6).

 Screw/bolt, front bracket to high-voltage battery supporting frame

*BA54.10-P-1007-02J

11

Remove bracket (5) from the high-voltage battery heater (4).

Only if high-voltage battery heater unit (4) or bracket (5) is replaced.

12

Install in the reverse order

13

Bleed cooling system.

AR20.00-P-1142-09SRE



Coolant specifications

BB00.40-P-0310-01A



Anticorrosion agent/antifreeze (specification 325.6)

BB00.40-P-0325-06A



Premixed coolant (specification 326.6)

BB00.40-P-0326-06A



Check

14

Check cooling system for leaks.

AR20.00-P-1010SR

 Battery

Number

Designation

Model 453.091/391/491

BA54.10-P-1007-02J

Screw/bolt, front bracket to high-voltage battery supporting frame

Nm

26