Start Control Module (SCU)

Fig 1: Identifying Start Control Module Location

Courtesy of VOLVO CARS CORPORATION

The start control module (SCU), with its starter button, is the unit that the driver uses to start the vehicle.

The start control module (SCU) activates the power supply to certain functions in the engine control module (ECM) via fuses in the front integrated relay/fusebox and central electronic module (CEM). The start control module (SCU) also supplies the engine control module (ECM) with start signals.

The start control module (SCU) transmits a high signal (U_bat ) to the engine control module (ECM) when the start control module (SCU) is in position III.

The engine control module (ECM) will activate the starter motor relay. In turn the relay activates the starter motor.

The start control module (SCU) is supplied with power from the fuse in the front integrated relay/fusebox.

The central electronic module (CEM) can diagnose the start control module (SCU).