Control Module, Separating From Hydraulic Unit
Special tools and workshop equipment required
- ESD Work Surface: VAS 6613
- Torx socket T25
- 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 ESP unit must be removed in order to separate the control module and the hydraulic unit. Refer to ABS Control Module -J104- /ABS Hydraulic Unit -N55-, REMOVING AND INSTALLING .
There is a risk of destroying the hydraulic unit by removing the return flow pump.
- Never separate the return flow pump from the hydraulic unit.
There is a risk of destroying the control module through the electrostatic charge and reduced cleanliness.
- Discharge electrostatic charge: touch the electro-static discharge work surface
- Protect the inner control module from moisture and dirt.
-- Touch a grounded object (ESD Work Surface: VAS 6613 ) before working on electrical components. Do not touch the connector terminals or electronic components directly.
-- Position the hydraulic unit with the control module on the ESD Work Surface: VAS 6613 .
-- Remove the three Torx bolts from the control module and set aside immediately (risk of confusing them with new Torx bolts).
-- Position the hydraulic unit with the control module from upward on the ESD Work Surface: VAS 6613 .
-- Pull the control module -1- off from the hydraulic unit -2- without tilting.
-- Cover the control module solenoid coils with a lint free cloth.
-- Check the cleanliness of the hydraulic unit sealing surface if necessary clean with mineral spirits and a lint-free cloth.
The hydraulic unit sealing surface must not be worked with a file, metal scraper, sand paper or similar.
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.
The seal on the control module cannot be replaced.