new ZR-1 owner needs help

[ZR-1 Black Beauty]

Hello. I have two 1993 LT1s, but just purchased a 1990 black ZR-1 with 33K miles and have some code/electrical issues I need help with.


My issues are:

• INFL REST light on
• ABS light on
• Selective ride light on
• LTPWS light not on (and it should)
• horn doesn't work
• stereo lights up, but no sound
• tach reads low

I have checked codes with a set of Gordon K's plugs and get some strange answers:

• INFL shows a 16 or 26 code, but only after waiting 45-60 secs (DIC light had strange flashes, so hard to get a true code reading)
• ABS gives no code (but DIC light is on)
• ECM shows no codes
• CCM shows no codes
• FX3 has a pile of codes (13,14,21,22,23,31,32,33,34,41,42,& 43)
• I switched front tires to get the car home, but did not get a LTPWS light or code

Do I have a bunch of separate issues or maybe a bad ECM or PROM? Any ideas or suggestions? Do I need a "real" ODB1 code reader?

Thanks for the help.