this may help you
iam not sure if it affects the american vehicles but it is for these years of Canadian ones not sure since you didn;t emntion the year.
http://www.tc.gc.ca/roadsafety/recalls/rec...&year=&cmd=next
Make: LEXUS
Model: LX470
Affected Year(s): 1998 1999
Units Affected: 88
TC Recall #: 1999071
Manufacturer:
Campaign Code:
Recall Details
On certain vehicles, water could enter the housing of the trailer towing wire harness converter due to inadequate waterproofing performance and improper installation location of the unit. A short circuit could occur which can cause failure of the converter, and, if a trailer is being towed at the time, can also cause failure of the trailer lights. In some cases the converter housing could melt or electrical feedback could blow the fuse, disabling the vehicle's rear lights. Driving without the vehicle tail and/or trailer lights will increase the possibility of a vehicle crash. Correction: A redesigned towing wire harness converter will be installed in a revised location.