WARNING: This page is about a different car, the 2006 Lexus GS 430 and 2006 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC TROUBLE CODE CHART
DTC No.
DTC Detection Condition
Trouble Area
58-11
RTC, ROM, and RAM of the GPS receiver and TCXO errors