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Cadillac
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1990
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Seville Base, 4T60/ME9
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Tests W/Codes
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IPC System Self-Diagnostics
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IPC Specific Input (II) Codes
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II78: Headlights Switch
II78: Headlights Switch
Display is HI whenever the headlights are on.