I agree. If the computer is sane, it will operate the SES light in diag. mode. If it won't operate the light, it's likely brain dead.
Had a '85 Olds once that did the same thing. Ran poorly and diags would not work, Took apart the ECM and debugged it; turned out it had a bad voltage regulator for the processor power, i.e. the computer was not working at all.
I repaired mine, but unless you are capable of that sort of thing, just replace it.
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum
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