If your Astra’s Horn isn’t working, one of the first things you should check is the horn relay. The relay is responsible for sending power from the battery to the Horn, so if it’s not working correctly, the Horn won’t either. The relay’s location is in the fuse box under the hood; if it’s faulty, you’ll need to replace it.
Chapter 2: Part C: 1.8 litre engine in-car repair procedures. Chapter 2: Part D: Engine removal and overhaul procedures. Chapter 3: Cooling, heating and air conditioning systems. Chapter 4: Part A: Fuel and exhaust systems. Chapter 4: Part B: Emission control systems. Chapter 5: Part A: Starting and charging systems. 36. Mobile telephone, digital radio, Twin Audio, display. 7,5. 1) Different ratings depending on engine and equipment level. WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market. Vauxhall Astra 5th Generation (Astra H) (2004 - 2010) - fuse box diagram.

i was reading another forum, the guy said have you try swapping the contact plate with the wires inside the steering wheelits works for him..so must be he fixed theni give a try swapping contact plate with the wires loom its works..the horn working since i done it. This is an older thread, you may not receive a response, and could be

astra h cim repair guide HI Guys.If someone of you is facing problems with the cim module of Astra H ( the horn doesn t work or it s working only with dimmed lights,it doesn recognize the transponder,or the steering wheel controls) this tutorial will help you to fix it lifetime waranty.Pass in pm after thanks and rep .
also your righr scroll wheel will not be working correctly and fault code B3646 will be stored "right scroll wheel range performance" or "right scroll wheel stuck". unplug your right steering wheel control then plug it back in if ithe horn works as normal its the wire behind the airbag and it costs about £6.00 + vat.
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opel astra h horn not working