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The only place for a coil spring is up Zebedee's arse.
Member
Joined: Jan 16 2016
Posts: 272

New one on me. Car parked up and locked on my drive and suddenly it generates a loud continuous clicking noise.
This is with everything turned off and no key in the ignition.
I investigate under the bonnet, check relays etc and the noise seems to be from the vicinity of the ABS pump. Quite loud. Under the fuse box but difficult to pinpoint exactly, even with a mechanics stethoscope.
I turn on the ignition, ABS pump starts and the clicking stops. The pump runs for maybe 35 to 40 secs before it builds pressure and cuts out. So I suspect the accumulator needs changing. It has lasted 20 years.
Car drives and brakes OK. If I lock it again it is quiet for a few hours but the clicking returns. Presumably as the brake pressure drops.
Question ... what can the clicking be with everthing turned off?

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Joined: Dec 30 2015
Posts: 4112

Looking at the diagram Relay 17 coil has ignition switched live on one side of the coil and is grounded through the pressure switch so shouldn't pull in without the ignition on. When it pulls in it supplies power to the pump from Maxi fuse 3. So it sounds like Relay 17 might be the one at fault. It isn't a standard relay either. Although a standard 4 pin relay will fit the socket it should be a dual contact high power relay so a standard one will burn out pretty quickly. The one you need will be black and the part number is PRC9566.

Member
Joined: Jan 16 2016
Posts: 272

Thanks Richard. I had the fuse box lid off and the sound wasn't coming from the relays.
However, just in case, I have ordered PRC9565 from Island4x4 anyway @ £33.
It was more from underneath. I was 90% certain it was the pump but couldn't hear anything with the stethoscope.
Maybe the faulty relay is switching the pump on and off rapidly?
Have disconnected the battery in the meantime.

Member
Joined: Jan 16 2016
Posts: 272

Relay replaced and problem solved.