WARNING: This page is about a different car, the 2003 Lexus GS 430 and 2003 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
POWER MAIN RELAY CONTINUITY
Condition
Tester connection
Specified condition
Constant
1 - 2
Continuity
Apply B+ between terminals 1 and 2.
3 - 5
Continuity
If continuity is not as specified, replace the relay.