Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.
That is a good question,good enough to be put on an automotive test.
With these lights on this indicates that one or more fault codes are set in the anti lock brake computer and/or 4wd computer.The codes are current now since the lights are on.If the lights go off the codes will store as history codes in the computer.
This indicates that when they are current the codes can be read out and the fault can be diagnosed properly with the issue being current.
When the lights go off and the codes are history codes the codes can still be read out with a compatible scan tool but usually the diagnosis will not reveal the fault since the fault is no longer occuring.
So in other words the codes can be checked with the lights on or off but testing is best done with the lights on as the fault is present to test and locate the issue.
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