ABS Control Module J104 , replacing

Removing

CAUTION: Only disconnect control module from hydraulic unit when removed.

NOTE:

Carefully clean hydraulic unit before removing.
Before removing control module, read out DTC memory and print out fault code if necessary.
Place hydraulic unit with control module on a clean, level surface.
The replacement should only be done by trained personnel.

Hydraulic unit, removing and installing → Hydraulic unit, removing and installing

Fig 1: Control Module & Bolts

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Loosen bolts - 1 - and remove control module - 2 - from hydraulic assembly without tilting.

Fig 2: Cleaning Sealing Surface

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Clean sealing surface - 2 - using a plastic scraper - 1 -. Check valves - 3 - for damage.

CAUTION: The sealing surface on the hydraulic assembly must have a clean, even surface.

If the sealing surface or contact tags are damaged, hydraulic assembly must be replaced.

The seal on the control module cannot be replaced.

The seal on the control module must not be pulled out or raised up.

NOTE:

Assembling

CAUTION: Moisture and dirt particles must not enter the inside of the control module.

Blowing out the control module or hydraulic assembly with compressed air is not permitted.

Excessive shaking (e.g. dropping, impact) may destroy the control module. Control module must then no longer be used.

Fig 3: Sliding Control Module Onto Hydraulic Unit

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Carefully slide control module - 1 - with coils hanging down over hydraulic assembly valves - 2 -. Make sure valves do not cant.
Edge of control module housing must slide over shoulder on hydraulic assembly.

NOTE:

Use new bolts.
A new control module may be assembled on an already used hydraulic unit twice at maximum in order to guarantee the seal of the elastic gaskets.
A control module which was once in driving operation must not be installed a second time.

Fig 4: Installing Control Module Onto Hydraulic Unit With New Bolts Tightening Sequence

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Press control module onto hydraulic assembly and evenly install new bolts - 1 - and - 2 - (do not tighten) until module evenly contacts ABS Hydraulic Unit N55.
Install bolts - 1 - through - 6 - as far as stop, do not tighten.
Tighten bolts - 1 - through - 6 - in specified sequence.

Torque specification 2.9 Nm.

Fig 5: Installing Control Module Onto Hydraulic Unit With New Bolts Tightening Sequence

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