On my 93 940T, the shiftlock override button only allows you to bypass pressing the brake pedal to shift out of park. The key has to be on acc, and the shifter button still needs to be pressed. I have no idea how this mechanism detects the key is on acc when the battery is dead, which I thought was the primary use for the override button. I've seen many cars, such as hondas and volvo 460s which do not require you to press the brake pedal to shift out of park, hence they do not have an override button at all.
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