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Re: anti lock light constant on Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Sun, 12 Oct 2008 06:09:10
In Reply to: anti lock light constant on, aaron, Sat, 11 Oct 2008 08:39:21 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Start the car and let it sit long enough that the Brake Fluid light goes off. If the ABS light stays on, the ABS failed its start-up built in test. Before the car starts moving, the ABS measure the resistance of each of the sensors. If the resistance of any sensor is well off from the others, it declares a fault, and that fault stays on until the car is shut off.
to abusot's point - check the sensor resistance. You'll find the ABS sensor connectors under the horizontal panel at the base of the windshield in the engine compartment, on the driver's side (LHD). Look for four connectors that look like thin cylinders, like short pencils with wires coming from each side. Pop them apart, and measure the resistance on the sensor end (the other side goes to the ABS box mounted right there). They should be all around 1200 ohms. If one is well out from that - like 800, open circuit, a short - that's the bad sensor.
Check the harness condition in the wheel wells of all four wheels. If it is a cable problem, it doesn't have to happen in the wheel well, but it is most likely and easiest to see. Look for a crimped, worn, chaffed, or otherwise not happy electrical cable coming from the hub area. If the cable is bad, you'll need to replace the entire sensor assembly and cable.
If the sensors all measure OK - say within 10% of each other - pop the connector off the ABS box and re-seat it back on. It might have been a simple bad connection.
OK, now you want to know what your friends did to your car - probably nothing. Likely just coincidence that it happened on their watch. However, if you do find a damaged cable - not one that looks worn, but actually fresh damage - then you can ask them if they drove the car down stairs. But likely is was just 'one of those things.'
If the measurement is OK, or you can't figure out which sensor it is, bring the car to a dealer or well-equipped Saab Indy and ask them to read out the code(s). You didn't say what year the car was - that can help some.
posted by 76.196.10...
, Sun, 12 Oct 2008 06:09:10 <-- Viewing This Message, Tue, 14 Oct 2008 19:13:39
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