ID.4 2021 ➤
Electrical system - Edition 02.2021
– Tighten nut -2-.
– Connect battery ⇒ Rep. gr. 27; Disconnecting and connect‐
ing battery.
– ⇒ Rep. gr. 27; Adapting battery monitor control unit [J367]
Tightening torques
♦ ⇒ Rep. gr. 27; Assembly overview – battery
♦ ⇒ a2.4 nd installing fuse holder A [SA]”, page 152
2.3
Disconnecting and connecting battery
WARNING
Risk of highly caustic battery acid.
– Keep suitable counteragent ready, e.g. soapy water.
WARNING
Leaking battery acid.
Risk of burns to the body and corrosion of the vehicle.
– Wear protective gloves, protective clothing and safety gog‐
gles.
– Battery must not be tilted.
– Neutralise sulphuric acid as soon as possible.
WARNING
Escaping oxyhydrogen gas when charging and due to subse‐
quent degassing.
Danger of explosion
– Avoid sparking.
– Avoid short circuits.
– No open flames.
– No smoking.
– No open light.
– Dissipate any static charge by briefly touching door striker
pin.
– Only work on batteries in well ventilated rooms.
– Make sure that the bleeder hole is on the correct side.
The battery monitor control unit -J367- will henceforth be refer‐
red to as “battery monitor control unit”.
The battery -A- will henceforth be referred to as “battery”.
2. Battery
7
ID.4 2021 ➤
Electrical system - Edition 02.2021
Disconnecting
– Switch off ignition and electrical consumers.
– Keep vehicle key and other entry and start authorisation
equipment (e.g. smartphone) outside vehicle.
Vehicles with refrigerant R744
WARNING
Risk of asphyxiation from refrigerant R744
When work is performed on the vehicle with the 12-V battery
disconnected, the sensor for interior carbon dioxide concen‐
tration is disabled.
– Work in interior must only be performed when the doors
are open.
– Observe safety precautions for working on air conditioning
systems.
All vehicles (continued)
– Open cover for negative battery terminal above battery mon‐
itor control unit -3-.
– Loosen nut -1- several turns, and pull battery monitor control
unit -3- off negative battery terminal.
– Use a commercially available voltage tester to check voltage
of 12 V electrical system.
•
The voltage must be 0 V.
Vehicles with energised electrical system:
– ⇒ ; Rep. gr. ; De-energise high-voltage system.
– Use a commercially available voltage tester to check voltage
of 12 V electrical system.
•
The voltage must be 0 V.
8
Rep. gr.27 - Starter, current supply, CCS
ID.4 2021 ➤
Electrical system - Edition 02.2021
All vehicles (continued)
Connecting
NOTICE
Risk of damage to the battery clamps for positive and nega‐
tive battery terminals and to the battery terminals themselves.
– Battery clamps for positive and negative battery terminals
may only be attached by hand without excessive force.
– Battery terminals must not be greased.
– Battery clamps for positive and negative battery terminals
must be installed in such a way that the battery terminal is
flush with the battery clamp or protrudes from it.
– Fit battery monitor control unit -3- on negative battery termi‐
nal.
– Tighten nut -1-.
– ⇒ Rep. gr. 27; Adapt battery monitor control unit [J367].
– Switch on ignition.
– Open and close door windows to fully opened and fully
closed position respectively.
– Then, when door windows are closed, pull the window regu‐
lator buttons until the relay audibly switches.
– Check convenience mode of the window regulator motors.
•
With “one-touch opening and closing” activated, door win‐
dows must close fully without the need to hold window regu‐
lator button.
This following work steps are necessary so that the ESP indica‐
tor lamp goes out:
– Activate vehicle’s drive system.
– Select drive position.
– Move steering wheel to full left and right lock.
– Read and clear event memory using ⇒ Vehicle diagnostic
tester.
•
ESC warning lamp must go out.
Tightening torques
♦ ⇒ Rep. gr. 27; Assembly overview – battery
2. Battery
9
ID.4 2021 ➤
Electrical system - Edition 02.2021
2.4
Removing and installing battery tray
Removing
– Remove battery -A- ⇒ Rep. gr. 27; Removing and installing
battery A.
– Unscrew bolts -2-.
– Remove cable tie from battery tray -1-.
– Remove battery tray -1-.
Installing
Install in reverse order of removal, observing the following:
Tightening torques
♦ ⇒ Rep. gr. 27; Assembly overview – battery
2.5
Checking battery A
2.5.1
Sequence for checking battery A
– ⇒ c2.5.3 olour indicator of battery A”, page 11
– ⇒ b2.5.4 attery A with battery tester”, page 12
2.5.2
Visual inspection of battery A
WARNING
Risk of highly caustic battery acid.
– Keep suitable counteragent ready, e.g. soapy water.
WARNING
Leaking battery acid.
Risk of burns to the body and corrosion of the vehicle.
– Wear protective gloves, protective clothing and safety gog‐
gles.
– Battery must not be tilted.
– Neutralise sulphuric acid as soon as possible.
10
Rep. gr.27 - Starter, current supply, CCS
2024 VW ID.4 Owner's Manual
