Take your car to the Nissan dealers they can locate the security code for the radio by the VIN number from the car.
the pressure is 32psi all round
Nissan Pulsar was created in 1978.
if you cannot pop it open then you either contact Nissan or throw it in the lake?
Nissan pulsar radio pin 4362 Nissan pulsar radio pin 4362
Ring Nissan Australia on 1800 035 035 , tell them the vin number and they will give you the code over the phone
http://www.commandocaralarms.com/wiring/1989/Nissan/Pulsar
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Nissan Pulsar firing order 1.3.4.2.
you should be able to find the number in the booklet that u have. its 4 digits
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Open bonnet, use a 10mm spanner, undo Negative terminal, then undo Positive terminal, loosen and remove battery bracket. Reverse procedure to install new battery.