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Old 14th November 2021, 19:22   #1
goltho
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Default Alarm horn sounds when washers activated!

A "funny" thing happened on the way to London a few days ago, the car's first long run after lots of repairs and upgrade work. Not long into the journey, I fired the windscreen washers to give the glass a bit of a clean and nearly died of fright as the alarm horn - which I didn't know it had - went BLAAAM BLAAAM.

After initially fearing the worst (that the ECU was about to explode ), I tried it again and sure enough, the alarm horn blammed twice and then stopped even although the washer stalk was still be pulled. I checked through everything else that mattered (lights, indicators, brakes etc) but everything seemed fine, so I kept driving and tried to come up with some logical explanation (I failed).

The horn didn't sound on a few subsequent washer activations but did it about an hour later when I tried it again. I drove back yesterday and it hasn't happened since.

My only thoughts have been water ingress into something but the car's not been subject to heavy rain here for the past 3 weeks or so. Mind you, just thinking about it, I did have it jet-washed the day before I left. Any ideas?

Dougie.
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Old 14th November 2021, 20:23   #2
stevestrat
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Do you have or have you retrofitted headlamp powerwash? There is a relay that operates either the standard alarm horn or the headlamp powerwash pump. When retrofitting powerwash a T4 (maybe TOAF?) has to tell the relay its function has changed, that's why when retrofitting the powerwash system the standard alarm horn has to be replaced with a BBUS (battery back up sounder) which is an electronic siren.
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Old 14th November 2021, 20:35   #3
goltho
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Quote:
Originally Posted by stevestrat View Post
Do you have or have you retrofitted headlamp powerwash? There is a relay that operates either the standard alarm horn or the headlamp powerwash pump. When retrofitting powerwash a T4 (maybe TOAF?) has to tell the relay its function has changed, that's why when retrofitting the powerwash system the standard alarm horn has to be replaced with a BBUS (battery back up sounder) which is an electronic siren.
Well I don't believe so! But I'll check in the morning. Interesting, thanks.

Dougie.

(PS: I ken where the Pons is. )
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R75 C2 RJBLH Connoisseur CDTi Auto Saloon
• Built 08/02/2005 @14:57 hrs: Registered 26/08/2005
• 122nd of 141 built that day
• British Racing Green Pearlescent (HFF)
• Sandstone leather with black piping (SPJ)
• 136,000 miles

Last edited by goltho; 14th November 2021 at 20:40..
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Old 16th November 2021, 00:00   #4
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There are in fact no headlamp washers fitted on the car.
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R75 C2 RJBLH Connoisseur CDTi Auto Saloon
• Built 08/02/2005 @14:57 hrs: Registered 26/08/2005
• 122nd of 141 built that day
• British Racing Green Pearlescent (HFF)
• Sandstone leather with black piping (SPJ)
• 136,000 miles
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Old 24th November 2021, 12:29   #5
goltho
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Sorted. Not a hugely difficult job in the end. I pulled the connector from the alarm horn.

Dougie.
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R75 C2 RJBLH Connoisseur CDTi Auto Saloon
• Built 08/02/2005 @14:57 hrs: Registered 26/08/2005
• 122nd of 141 built that day
• British Racing Green Pearlescent (HFF)
• Sandstone leather with black piping (SPJ)
• 136,000 miles
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Old 24th November 2021, 21:15   #6
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Quote:
Originally Posted by goltho View Post
Sorted. Not a hugely difficult job in the end. I pulled the connector from the alarm horn.

Dougie.
WELL--. Sort of sorted until you need your alarm to do its job.----
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