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Checking Start Control Module (SCU)

To be able to remove the key, it may be necessary to directly supply the Start control module (SCU) with voltage.

Disconnect the 8-pin connector from Start control module (SCU) and supply with voltage +12 V on #B7 and ground on #B8.

If the key still does not come loose and the fuse, for the voltage supply to the ignition switch, blows the ignition switch should be replaced.

If the key becomes loose, fault trace the Central electronic module (CEM) and check the new cable from the Start Control Unit (SCU) #B8 to the Central electronic module (CEM) #B13 (#13) with regard to open circuit, connector resistance and oxidation.

Remedy as necessary.

Other information 

Fig 1: Identifying Start Control Unit (SCU)
GLL117646Courtesy of VOLVO CARS CORPORATION

Was a fault detected?