Accord L4-2.4L (2005)
Defogger (Canada)
8. Connect the No. 12 and No. 11 terminals with a jumper wire, and check for voltage between the No. 4 terminal of the mirror connectors and body
ground. There should be battery voltage and both mirrors should warm up with the ignition switch ON (II).
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If there is no voltage or neither warms up, check for:
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An open in the BLK/YEL or ORN wire.
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Blown No. 30 (7.5 A) fuse in the under-dash fuse/relay box.
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If only one fails to warm up, check:
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Its defogger.
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Poor ground (G501, G601).
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If both warm up, check the defogger switch.