93 Dodge Caravan - Can't Get Fault Codes?

Hi there,
I've got a 93 Dodge Caravan and I can't seem to access the fault codes via the on-off-on-off-on keying method. I've tried 3,4,5 on-offs,
3,4,5 acc-ons... nothing seems to work! Heard you should have parking brake engaged, so I tried that too with no luck.
If there aren't any fault codes, shouldn't I still get a 55 code signalling the end of the fault codes? Or is no news good news?
Thanks.
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You start from ON, then turn Off to On 4 times, ending with it being on...
Yes, even with no codes, you should still get the 55-code (end of codes.) Unfortunately, no news is BAD news. If you aren't getting any codes at all (55 included,) you _may_ have a wiring problem to the computer, or a bad computer...
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all
On off on off 3 times not four
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OK, fine.. Get technical...
Truthfully, I've never had a problem with doing it 4 times. It works just as good as 3 for me, though I guess some cars may be anal and not work at 4 times...
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