Check the control module

Fig 1: Control Module

Courtesy of VOLVO CARS OF NORTH AMERICA.

Check: 

• that the control module is of the correct type (this depends on whether the car is equipped with STC or not)
• that none of the pins or sockets on the connector are damaged
• that there are no contaminants on the mating surfaces between the control module and the ABS hydraulic modulator
• that no part of the control module seals remain on the ABS hydraulic modulator valves.