Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
on these earlier cars there's no remote release pull in the wheelarch like the later 1998 onwards cars
so I've known one technique to work is to slip a credit card or other thin plastic 'blade' into the gap and push down on the cable attachment point to try and get the lock to 'pop
I've attached an image of the lock so you can see where to push
your question title said 1978?
if its a 1998 then you should have the emergency release cable hidden in the wheelarch?
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