Volkswagen ID.4: Charging unit for high-voltage battery, with integrated voltage converter

• Assembly overview - charging unit for high-voltage battery
• Removing and installing charging unit 1 for high-voltage battery AX4

Assembly overview - charging unit for high-voltage battery

1. High-voltage electrical connector
2. Charging unit 1 for highvoltage battery - AX4-

• With voltage converter - A19-
• With control unit for high-voltage battery charger - J1050-
• ⇒ Rep. gr. 93 ; Removing and installing charging unit 1 for highvoltage battery AX4

3. Bolt

• 14 Nm

4. Earth wire

• With potential equalisation line

5. Nut

• 20 Nm

6. Electrical connector for electrical system
7. 12-V voltage supply

• Positive terminal

8. Coolant connections with pressure differential sender for coolant - G1213-
9. Bolt
10. Bracket for charging unit 1 for high-voltage battery - AX4-
11. Bolt

• Qty. 8
• 20 Nm

12. Electrical connector
13. Coolant hose
14. High-voltage electrical connector
15. Bolt

• 8 Nm

Removing and installing charging unit 1 for high-voltage battery AX4

Special tools and workshop equipment required

• drip tray - VAS 6208-
• engine bung set - VAS 6122-
• hose clamps up to 25mm - 3094-

The charging unit 1 for high-voltage battery - AX4- will henceforth be referred to as "charging unit".

Pressure differential sender for coolant - G1213- will be referred to hereafter as "pressure differential sender".

Removing

DANGER

High voltage can cause fatal injury.

Danger of severe or fatal injuries from electric shock or electric arcs.

• Have a high-voltage technician (HVT) or a high-voltage expert (HVE) de-energise the high-voltage system.

• ⇒ Rep. gr. 93 ; De-energise high-voltage system .

If the charging unit is renewed, perform the test plan for renewal of the control unit:

• Carry out function "Renew control unit" using ⇒ Vehicle diagnostic tester ⇒ Rep. gr. 00 ; Access to diagnoses .

Continued

• Disconnect battery ⇒ Electrical system; Rep. gr. 27 ; Battery; Disconnecting and connecting battery .
• Remove rear underbody cladding ⇒ General body repairs, exterior; Rep. gr. 66 ; Underbody cladding; Removing and installing rear underbody cladding .
• Remove rear centre underbody cladding ⇒ General body repairs, exterior; Rep. gr. 66 ; Underbody cladding; Removing and installing rear centre underbody cladding .
• Remove skid plate ⇒ General body repairs, exterior; Rep. gr. 66 ; Underbody cladding; Removing and installing skid plate .
• Place drip tray - VAS 6208- under rear section of vehicle.
• Clamp off coolant hoses -1- using hose clamps up to 25mm - 3094- -A-.

• Disconnect electrical connector -1-.
• Open retaining clip -2- and -3-, and pull coolant hoses off charging unit.

• Disconnect electrical connector -1- and -3- from charging unit -2-.

• Disconnect electrical connector -2- and -3- from charging unit -1-.
• Unscrew bolt -4-.

• Unscrew nut -2-.

• Unscrew bolts -1-.
• Remove charging unit -2- with bracket downwards.
• Place charging unit -2- on a clean surface.
• Protect connector receiver and coolant connections to prevent the ingress of dirt.

• Unscrew bolts -3-.
• Remove bracket -2- from charging unit -1-.

Store removed charging unit with pressure differential sender for coolant - G1213- Time before installation and filling of cooling system is longer than 6 hours.

Continued

NOTICE

Deposits from dried coolant in the measuring chambers of the pressure differential sender.

The pressure differential sender is no longer functional.

• The measuring chamber in the pressure differential sender must be filled with coolant and sealed.

• Pull out retaining clip -3-.
• Open clamp -1-.
• Pull off pressure differential sender -2-.

• Fill pressure differential sender -1- with coolant at openings -arrows-.

Important

• Make sure that no coolant can escape during storage.
• Seal openings on pressure differential sender -1- with clean sealing plugs -A- from engine bung set - VAS 6122- .

All vehicles (continued)

Installing

Install in reverse order of removal, observing the following:

• ⇒ Rep. gr. 19 ; Cooling system/coolant; Filling cooling system .

If the charging unit has been renewed, perform the test plan for renewal of the control unit:

• Carry out function "Renew control unit" using ⇒ Vehicle diagnostic tester ⇒ Rep. gr. 00 ; Access to diagnoses .

Continued

WARNING

High voltage can cause fatal injury.

Danger of severe or fatal injuries from electric shock or electric arcs.

• Have a high-voltage technician (HVT) or a high-voltage expert (HVE) re-energise the high-voltage system.

• ⇒ Rep. gr. 93 ; Re-energise high-voltage system .

Tightening torques

• ⇒ Rep. gr. 93 ; Assembly overview - charging unit for high-voltage battery

Charging unit for high-voltage batteryVehicle noise/engine sound