Tbh the requirements will be mostly the same.
First you need to go into the airbag computer and de-configure the airbags, seats, steering etc. basically whatever you've disconnected. or use resistors to get the airbag lights to turn off. The service light may be on because the airbag light on.
Whilst you've got clip you can go into the injection computer and do a fault check. If you have any permanent faults which show red rather than flashing orange then this could be the cause of the spanner light.
My money would be on, the spanner light is on because of the airbag light is on though.