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Discussion Starter #1
I've got a strange issue with my Zafira 1.6 2001.
A few weeks ago, the ABS telltale light came on and stayed on.
Last night, while driving in the dark for the first time in months, I switched on the headlights.
A warning message for headlight/tail light fault came up. I checked and one of the tail lights was out.
But I then noticed that the ABS telltale light was out, and stayed out.
Can a blown bulb have affected the ABS warning light?
I know the wires for both are in the same harness. Could the ABS have picked up the voltage from the tail light wire?
 

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Discussion Starter #4
So since the bulb change , no ABS warning lit up ?
The problem with the tail light was that the metallic body of the bulb was slightly corroded and dirty and was not making a good contact with the ground in the holder.
I cleaned the bulb with a piece of sandpaper and it worked again.
Also the ABS telltale remained off. I tested the ABS on a gravelly road and it worked as it should.
So the bad ground connection at the bulb was definitely fooling the ABS into thinking that there was a fault in its own circuit.
Perhaps the ABS cables should have been shielded, I don't know.
But definitely a bad design that could cost people a lot of money.
I'd already forked out for a hub and rear cable harness, neither of which will be needed.
 

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Well it’s sorted which is good , the ABS light coming on may well have been to do with the something else.
Did you scan the modules for a fault code ?
 
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Discussion Starter #6
Well it’s sorted which is good , the ABS light coming on may well have been to do with the something else.
Did you scan the modules for a fault code ?
The fault code was C0045 - (4) Rear left wheel sensor open circuit - present.
Somehow the faulty ground connection at the tail light bulb created the ABS fault code.
 

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Discussion Starter #7
Well that was fun while it lasted.
After driving about 100 miles in total the ABS light came back on.
I'm wondering if there might be a ground problem.
Does the ABS system and/or cables have any grounding points that might need cleaning?
 

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Ok you’ll need to code read it again.
So not related to the bulb after all,
 
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Discussion Starter #9
Ok you’ll need to code read it again.
So not related to the bulb after all,
Cleared the code and refreshed, code returned, same one C0045.
But while the diagnostic tool was connected the ABS telltale light went off.
Cleared the code again, and it did not return.
Drove around for about 20 miles - light still off, but I'm not confident it won't return.
I wonder if it might be a faulty ABS cable - the one that connects both rear sensors to the bus?
 

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Maybe it’s time to fit the new abs hub unit you bought ?
 
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Discussion Starter #13
Broken wiring ?
I hope so - the cable's date of manufacture is 1997 so maybe one of the wires has deteriorated with age and is making intermittent contact.
I bought another second-hand cable that I've tested for continuity and seems ok.
I'll try to fit it and at least that will be eliminated as the fault.
 
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