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Home › Cadillac › 1990 › Seville Base, 4T60/ME9 › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes › IPC System Self-Diagnostics › IPC Specific Input (II) Codes › II78: Headlights Switch

II78: Headlights Switch

Display is HI whenever the headlights are on.

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