Volvo v70 horn not working, any ideas anyone?

Not too hard. You pop the grille out, which if it is like the S60 and V70, you pop out the reusable plastic rivets on the slam panel under the hood, bend the plastic forward, reach your hand in and push the grille out (or push on the tabs to release it and then push it out).
Then you can access the horns from the front.

It's doubtful the horns are bad, if that's why you want to get to them, but test them with 12v and see.

If they're not working right, it's possible that your alarm module is bad - but that would be another thing to try once you've determine the horns are good.

It will cost well over $250 through a Volvo Dealer just for the Fob and that is the only way to do it. Volvo should be able to sell you a new key but they will need your Vin Number.

abs relay is built into the abs pump. had a v90 and it was in there. turn'd out to be a damaged conector plug at fault.

The exact same set of codes have just come up on my car, the same car and year. Did you solve it? I am thinking cleaning the throttle body first, any help appreciated....

If it's not the fuse, the connections may be worn out inside the wheel.

The service indicator works on how you drive the car rather than on mileage

CHECK HORN RELAY.AND GROUND.

99% Bad ABS Module.

Unless you have a cut ABS wheel sensor.
I fix them my self.

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the climate control head is bad

mass air meter