Control Unit - Volvo 850 Accessories Manual

Fig. 2: Locating Brake & Clutch Valves & Servo
Courtesy of Volvo Cars of North America.

CONTROL UNIT

Control unit is located in underhood fuse and relay center.
See Fig. 3. Control unit receives signals from sensor and switches.
Main function of control unit is to decide if system can be controlled
based on values and status of input signals, and to regulate system
for optimal function.
Control unit also performs diagnostic functions. This
enables the unit to communicate with the technician via the underhood