The first thing you need to do is to have the abs computer scanned for codes, the abs may be related to the 4wd problem, by scanning the codes this will give you an idea of the problem, for example they scan it and it reads p1542 rt frt sensor out of spec, this would mean theres a problem with the right front speed sensor, when ever the computer sees a problem it stores a code and turns on the light for whatr ever system fails, hope this helps.
Whenever
this warning light or any other stays on in the dash it is indicating
that the systems control module (or the system sensor in the case of
lights like low oil pressure, door open indicators etc.) has detected
a fault, it then disables the system (this applies to ABS,TCS, TCM,
SRS, TPMS and BCM faults and others) as long as the light is on. You
must now have the dealer hook up a special electronic diagnostic tool
and "scan" the system for the fault code that is stored for
the problem(s)
Legend of Abbreviations. ABS Anti-lock brake system. TCS Traction control system, TCM Transmission control module, SRS Supplemental restraint system, BCM Body control module. TPMS Tire Pressure Monitor System
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