I seem to remember reading somewhere that the 'built in' test button and LED were only provided in cars cold in California. Something to do with emissions?

Brake light code read from pin 14 would be the cruise control fault codes, nothing to do with engine management.

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Mick J
'08 Chrysler 300CRD (MB OM 642 engine)
'95 E220 estate
'89 230TE (R.I.P.)