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You fix one thing and then....!

appletonn

appletonn

New member
OK, so after fixing the front smile and heading out for a celebratory run on the slippery, damp roads!

After a slightly exuberant exit from a slippery roundabout, during which there may have been some slight wheelspin [;)], I was suddenly faced with the ABS warning light and the insistent beeping of the warning buzzer![8|]

If I park up and switch off, when I start up again I have no warning light, but as soon as I start to drive, up pops the warning light and off goes the buzzer.

I'm guessing that I need to check and clean the ABS sensors, at the wheel hubs?
 

I hope it might be something simpler for you.

Check the plug to the ABS controller is seated correctly. Undo it and then firmly push it home. There is clip to lock it home - make sure you hold this up will pushing the plug in and then realease it.

Also check that the 10 mm nut on the positive battery cable is tight as this secures the power link to the ABS controller and can cause probs if not making a good contact.
 
While you're at it shine up that connection to the battery with some emery paper. I picked up that tip recently from Rennlist and since cleaning it up my ABS has worked much better than ever before. [:)]

Don't forget to undo the earth lead before doing any of these things (I'm sure you knew that but thought best to mention it in case).
 
Yeah baby!![:D]

Removed the ABS relay and cleaned up the contacts and sprayed some contact cleaner onto it before replacing it - it seemed a bit loose and flimsy, so that was going to be the first thing I replaced, should I not make any progress.

I then removed the ABS fuse, and promptly dropped it down the back of the board, never to be seen again...DOH![8|]

Found another 15A fuse in my cupboard of bits and fitted it, without checking that the contacts were spotlessly clean... (you can probably guess where this is going [8|]).

Removed the earth point by the battery and cleaned the connections before reconnecting it. Next unclipped the ABS brain connector, cleaned up the two parts and pushed it down firmly until the retaining clip clicked into place

Started the car, to be immediately greeted by the buzzer and warning lamp before I had even put it in gear.[:mad:][8|]

Removed fuse, cleaned up the tarnished spade part with sandpaper until nice and shiny and replaced it.

Started car, no buzzer and no warning light! Drove it forwards and backwards several feet and still no buzzer or warning light!![:D]

Horrible night, so proper test tomorrow in daylight but it would appear that I might have fixed my gremlin.

Thanks again Steve, for the pointers. [:)]
 
From Adrian's book,
ABS light goes out after 2.5-5seconds and immediately comes back on with warning horn. This indicates that the ABS control unit has failed or an ABS solenoid valve inside ABS hydraulic has short-circuited.

ABS warning light goes out after 2.5-5 seconds and stays out until the 964 has reached 7kph plus a few seconds and then comes on again. This indicates that there is a wheel speed sensor problem or the ABS hydraulic unit has failed.


Hope this helps.
 
ORIGINAL: appletonn

Removed the earth point by the battery and cleaned the connections before reconnecting it. Next unclipped the ABS brain connector, cleaned up the two parts and pushed it down firmly until the retaining clip clicked into place
Click to expand...

My buzzer kept going off when I did it that way. I found that I had to hold the clip open and firmly push the plug in place and then let the clip go.

To get the lost fuse, remove the allen bolt on the side and the white block it secures, undo the black thumbscrew and pull up the fuse panel and retrieve the lost fuse. Been there a few times!
 
Hmm, progress of sorts.

Went for test drive this morning and all OK, no buzzer and no warning light.

Parked on path and then went to reverse 3 ft to align car to put it into garage and... bloody buzzer and warning sign!!![8|]

Decided that it must be a mechanical rather than electrical issue, so removed offside ABS sensor and cleaned it up before refitting it. Brief test reversing and all OK, but got the other side to do now.

I'm checking the connectors to the loom at each corner too.

The magnetic sensor wasn't too bad tbh, with none of the bits that Steve found with his - maybe it's the other rear wheel?!

As it only started after that brief bout of wheelspin, I am leaning towards the rear wheel sensors first.

We'll see[8|][:D]
 
OK, well still got an intermittent fault somewhere.

Removed and cleaned the other rear ABS sensor, which was somewhat dirtier than its neighbour. Also removed the positive feed terminal for the ABS at the battery and used emery paper to clean up the slightly tarnished connectors.

Checked that the connector to the ABS 'brain' was fully seated and then started the car up and reversed down the drive...

No buzzer or light!!

Turned car off and the restarted to drive it into garage - aaarrrggghhh!, buzzer sounds!!!

Turned car off again, restarted and drove around the block, no buzzer or light!!

So basically spent several hours messing around and now have an intermittent fault rather than a constant one!!

Off to do some more research!
 
Does anyone know if the clock issue, documented on Rennlist would give you just the ABS warning light issue, or the warning buzzer too?

Just trying to eliminate causes[8|][:D]
 
I can sympathize with intermittent electrical faults after my recent experience!

I recently disconnected the clock and although the ABS light was illuminated the buzzer didn't sound so I don't think the clock would be a cause.

I also never got the buzzer when my wheel sensors were dirty (I just got unpredictable ABS when braking).
 
I was plagued by ABS & TC/diff warning lights and buzzers on my C4 over the summer...... Charging the battery up for 24 hours has cured it - read somewhere something about some sensors being very voltage sensitive - sorry that last bit was a bit vague!

Rgds, Ade
 
Hmm, the car is normally connected to a Ctek battery conditioner so the battery is always topped up, although I have no way of knowing just how old the battery is - it is a Bosch Silver one and looks a couple of years old
 
Minor update!

Dropped into Unit 11 early on Friday morning and Jonny checked the resistance of the 4 wheel sensors/cables - one rear one was fractionally different to the other 3, but shouldn't be enough to raise a fault.

We also tried a different ABS brain, but that was clearly kaput as the car threw up the warning alarm immediately.

Today have removed the two relays that sit under the cover, directly on top of the ABS pump and cleaned the contacts. Also removed and cleaned the main power connector to the pump.

Not tested the outcome yet, but going over to my Dad's on Sunday to play 'swap the relays/brains' to try and eliminate those expensive bits[8|][:D]
 
Ok, after cleaning the main power supply to the ABS pump, we started to swap components over from my Dad's C2 to mine.

Starting with the main relay by the bulkhead...

RESULT![:D]

No buzzing and no warning light.

Swapped back to my relay, just to be sure, to be met with the buzzer and light once more!

Now, just need to price up the relay, but could have been much worse![:D][:D]

The drive home was far more enjoyable than the drive out, especially with dry roads and a solution in sight [;)][:D]
 
Sounds a good result. Where is that relay located? In the fuse panel like most of the others?

Most relays seem to be about 20 quid in my experience.
 
ORIGINAL: Steve Brookes

Sounds a good result. Where is that relay located? In the fuse panel like most of the others?

Most relays seem to be about 20 quid in my experience.
Click to expand...

In the fuse panel and it's the tall silver metal one - position R34 on my car!

It is a crimped type of case ,which means it would be difficult to open and repair - 928 part number!

Cheapest thus far is Club Autosport in Brum - £47.50 for a relay![8|]

Will ring Bolton OPC tomorrow
 
I tried to open the ABS relay when I was having warning problems - not luck. Relay looks very second hand now!
 
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