[ghlkal]

Originally Posted by alwayscode390

I'm not quite sure what the aftermarket radio will do in this situation, but I have one installed also... its been in the car for years though.

There are two lines from the factory head unit that go back to the CCM which usually aren't present on an aftermarket radio. Lines for the LCD and LED dimming circuits are open without the factory radio and CCM codes 72 and 74 can be set. If that happens, SYS will also flash.

The PO had an aftermarket radio in my Z, but I didn't have SYS flashing. Codes 72 and 74 were set though in history though.

There is a fix for this involving adding two resistors in the circuit. (TSB 93-68-9A) I did do this, mainly because I was wondering if it was the cause of my dim dash lights (it wasn't). I think the procedure is on our site somewhere. I've heard that many other owners haven't done the fix and there is no SYS light with an aftermarket radio.