2007 Vauxhall Astra Design
Horn not Working

3 points

Problem added: Aug 27, 2020 (3 months ago)
Pressing the horn buttons increases the volume of the radio, but no sound from the horn.
I would prefer the horn to work normally, but, is it possible to bypass the existing buttons and fit a separate 'flick' switch more suitable for Fiamm air horns, or even just a normal switch and additional normal horn.

Car details
Car: Vauxhall Astra
Variant: Design
Model Year: 2007
Category: Electrics, ECU, Warnings & Lights
Replies and Fixes
2,162 points

Aug 27, 2020 (3 months ago)
Personally I would just stick with the standard horn , changing is possibleBut ,for convenience and mot standard Better kept standard ,somethings worn or not earthing correctly probably your issue
3 points

Oct 9, 2020 (1 month ago)
Had this problem myself. Tried the lot, replaced horn and checked poor earthing etc. Neither the horn or lights would work if the lights were on.

Your problem will be an ICU most likely the SIMM in the steering wheel assembly . Not cheap :-(
3 points

Oct 9, 2020 (1 month ago)
Many thanks for both suggestions, I had one quote which included a non existent diagnostics check for £885, but finally went to an auto- electricians garage a stones throw from Morrisons of Woking, Surrey, and paid total of just under £400. The sim unit in the steering wheel was the problem. Cost of new unit £299. and £99.00 for labour.
16,010 points

Oct 9, 2020 (1 month ago)
Glad you got it fixed , thanks for updating the forum.
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