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Home >> Volvo >> 1998 >> S90 AW30-40 >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Shift Interlock Systems >> Description & Operation >> Shift Lock Override

Shift Lock Override

NOTE: For vehicles with ignition switch interlock, ignition key must first be turned to position I or II.

In order for gear selector to be moved from Park position when vehicle lacks battery voltage, or if there is a fault in the Shift Lock mechanism, it is possible to disconnect the interlock mechanism mechanically. Mechanical release consists of a push button marked "SHIFT LOCK OVERRIDE" on the gear selector assembly. When this button is pressed, solenoid lock pin is released and gear selector can be moved from Park. In earlier models, mechanical release was located under gear selector brush beside the text "SHIFTLOCK RELEASE". Mechanical disconnect must be used together with ignition key every time gear selector is moved from Park as long as fault remains.

There is a micro-switch in the electrical circuit between the brake lamp switch and solenoid. Microswitch only closes the circuit in Park position, so that the solenoid is not activated every time the driver presses the brake pedal when driving.