Just thought wanting to share this in case anyone is in panic... you probably will be fine......fuses blown to save you
Reference:
https://www.clublexus.com/forums/gs-...unction-2.html
Onwers' manual

 

References

 

If you have done stupid things like me, your car probably is paralyzed right now, don't start, christmas tree light...should you scrap your car? no calm down.

1. The main fuses are blown, the part number needed is 8262053010. To access it, it is on the left side engine compartment fuse box,

Needing to remove battery first, then remove the connector for that is holding the only currently visible 10mm nut. To remove that connector, locate two pins on outside of the fuse by engine side, push them in, easily remove the connector. Now by removing the 10mm nut, one side of your block main fuse is free

Then I recommend cutting the fuse box slightly and plastic weld/tape it back, without cutting it it you will really have some real fun doing this job. 8262053010 is a one big block on the right top corner, to remove it needing to remove one nut by the engine side and another nut accessed from cutting the fusebox, you can easily see it. Next, take out the block assembly, there are three 10mm nuts that are held dear tight once you remove the main fuse assembly/block. Remove them is easy, then the hardest part is actually to reconnect the battery side nut, cuz taht is a wire that pinch against the 3 of 10mm nuts you just connected. Finsh this, reconnect the connector that was removed, now your car probably will start and boot up most of the system

2. Check all your interior fuses and engine bay fuses. For interior, one by passenger one by driver, the last one is in the trunk, a ***** to check and remove but you gotta do it

3. After all set, I believe the last item to take care of is the parking brake. Firs step is to connect your OBD scanner, clear your EPB errors code first. Must DO IT FIRST!

5. Refer to post #2, now, manually release parking brake using the given tool, it is right by the spare tires, a weired plastic body plug is there so u won't miss it

4. You will need what I posted in #2, do the OBD/DLC3 port jump, just one clarificatiosn that step d(1) and d(2) really is just push parking brake button in then lift it up twice, press brake once and release once then repeat...remember you need to disconnect the OBD jump wires after doing this button/brake interaction

5. Once the procedure is finish, remove the jump wire, now touch your parking brake button, and your EPC should be able to be operated like normal again

Have fun on the road and don't be as careless and stupid as me again

 

And your battery need to replace too, because it drops under 12V.