Control Module, Disconnecting And Connecting To Hydraulic Unit

WARNING: This page is about a different car, the 2022 Volkswagen ID.4 and 2021 Volkswagen ID.4. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Electro-Static Discharge Work Surface: VAS6613

ABS Control Module -J104- will be called control module in the information that follows.

ABS Hydraulic Unit -N55- will be subsequently called hydraulic unit.

Conditions

If the control module is faulty, then the control module must be separated from the hydraulic unit and only the control module replaced.
If the hydraulic unit is faulty, the hydraulic unit and the control module must be replaced together.
The seal on the control module must not be pulled out or raised up.

CAUTION:

There is a risk of damaging the hydraulic unit by removing the return flow pump.

Hydraulic unit malfunctions.

- Never separate the return flow pump from the hydraulic unit.

-- Remove the control module and hydraulic unit. Refer to CONTROL MODULE FOR ABSJ104/HYDRAULIC UNIT FOR ABSN55, REMOVING AND INSTALLING .

CAUTION:

Risk of damaging electrical components.

The electrostatic charge can damage electrical components.

- Procedures at the electrical components must only be performed at an electro-static discharge work surface.

-- Place the hydraulic unit with the control module on the ESD Work Surface: VAS6613 .

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Control Module with Three Bolts

-- Remove the bolts -1 through 3-.

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Control Module with Four Bolts

-- Remove the bolts -1 through 4-.

Fig 1: ABS Control Module -J104-, Installing - Tightening Sequence

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Continuation for All Vehicles

-- Remove the control module -1- evenly in the direction of -arrows- from the hydraulic unit -2-.

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-- Cover the hydraulic unit actuators -2- with a lint-free cloth.

Connecting is done in reverse order, at the same time note the following:

Conditions

If a thread is damaged in the hydraulic unit, the hydraulic unit must be replaced.
If the hydraulic unit sealing surface is damaged (for example through grooves or scrapes) the hydraulic unit must be replaced with the control module.
The seal on the control module must not be pulled out or raised up.

-- Clean the sealing surfaces between the hydraulic unit and control module with a lint-free cleaning cloth.

CAUTION:

Risk of damaging due to incorrect assembly.

Leaks between the control module and hydraulic unit.

- The new control module may be installed only 3 times.

- Control modules that were in operation are replaced after removal.

-- Place the control module evenly on the hydraulic unit.

Tightening Specifications

Refer to Overview - Control Module and Hydraulic Unit .