Ridgeline V6-3.5L (2006)
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An open in the BLK/YEL and ORN wires.
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Blown No. 30 (7.5 A) fuse in the under-dash fuse/relay box.
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Poor ground (G402).
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If only one fails to warm up, check its defogger.
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If both warm up, check the defogger switch.