I too have just acquired a 1998 LS400 with built-in Motorola phones fore and aft, so would really value any help in getting them working. - and shall watch this space.
Napotoo
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I've decided to rip out the phone in the arm rest . Cannot find the sim holder.
I've found the big box , but no other box is in the boot , just wires.
think somebody must have taken it out .